<!-- Immersive Vibe v0.7.0 (built on VibeXR Interaction Framework v0.8.22) - single-file build (open in Quest / Galaxy XR / Vision Pro browser, tap Enter)

  v0.8.7: far grab has no minimum distance (no jump when ray-pinching something close); far cone narrowed to
          2\u00b0 diameter (1\u00b0 half-angle); idle cursor more visible (brighter ring + centre dot) and the cursor /
          ray blend smoothly between idle, hover and select (cursorStateSmoothing).
  v0.8.6: sketch board scaling also only updates while its handle is selected (like the facing);
          cube-vs-cube physical collision and the settle-to-table fall removed.
  v0.8.5: sketch board faces the viewer only while its handle is selected, and the facing is computed from the
          panel centre (not the handle pivot); released, it keeps its orientation.
  v0.8.4: table height calibrated to 0.5 m below the headset on every session start and reset
          (TABLE_BELOW_HEAD); board slope back to K = 0.8 (linear, no upper clamp); softer far depth gain
          (reachRef 0.35 -> 0.45, depthExponent 1.4 -> 1.25, speedMax 3 -> 2.5, about 30 % less push / pull).
  v0.8.3: board never looks smaller with distance - slope K = 1 (constant angular size) and the 4x upper
          clamp removed, so beyond 0.5 m the scale follows the same linear slope however far the board goes.
  v0.8.2: board distance scaling - fixed inside 0.5 m, beyond that linear with slope 0.8 (BOARD_SCALE_NEAR / _K).
  v0.8.0
  - playground: (removed in v0.8.6) physical collision between the table cubes (box vs box, least-penetration push; held pushes free).
  - sketch board: pivot moved to the handle bar, so distance scaling and facing happen about the grab point -
    pulling it nearer by ray-pinch no longer slides the handle out from under the pinch.
  v0.7.9: sketch board scales with distance to the viewer (constant angular size); two-hand scale edits the
          user factor on top of that rule.
  v0.7.8: sketch board keeps facing the viewer while dragged / scaled (re-faces the head every frame);
          its handle drag is translation-only (new opts.translateOnly).
  v0.7.7: cursor always visible while aiming (dim without a target); depth from a separate larger cone
          (cursorConeAngle 10\u00b0 half-angle); nothing inside it -> depth is held, no fallback to a default.
  v0.7.6: far cone tightened - hand / controller half-angle 2\u00b0 (4\u00b0 diameter), sticky exit 1.25x (5\u00b0 max).
  v0.7.5: temporal solver on top of the spatial cursor depth (cursorSmoothing / cursorMaxSpeed, visual only).
  v0.7.4: cursor depth is spatial, not temporal - a function of the ray orientation blending the two
          angularly nearest targets (cursorBlendAngle / cursorDefaultDepth); no lag, no drift when still.
  v0.7.3: hand mask + outline forced first in the opaque pass so cubes / spheres / table are clipped by the
          hand too (not only the UI); UI panel moved off the table edge.
  v0.7.2: sketch board handle on the lower edge (toolbar moved to the top); table at 1.44 m.

  v0.7.1
  - far ray is straight again (no bend toward the target); depth interpolation kept, hover = reticle + ray colour + highlight.
  - sketch board: drag handle above it (move / two-hand rotate + scale); placed on the left by default.
  - table raised (see TABLE_TOP); UI panel and log follow it.
  - hands: outline hull is opaque, so UI in front of the hand covers it and UI behind it is occluded correctly.

  v0.7 changes
  - playground: SketchBoard - a 2D canvas you draw on with any method (fingertip poke with depth-based
    width, near pinch, far ray pinch / trigger, mouse). Auto colour = by method; swatches + Clear below it.
  - interaction: opts.multi - several simultaneous selections as independent presses (both hands can draw).
  - ui: fixed the see-through hole behind panel titles / button labels / slider labels (text quads no
    longer write depth; explicit renderOrder background < base < text).

  v0.6.2: the far ray cursor interpolated its depth over time between targets (replaced by the spatial rule in v0.7.4).
  v0.6.1: table raised to 1.04 m (TABLE_TOP constant in the playground; cubes, orb, bell and labels follow).

  v0.6 changes
  - hands: the joint / bone skeleton is hidden by default; "Joints" in the hand menu turns it on.
  - hands: the hand mesh is drawn as a white outline only (depth-only mask + inverted hull), so the
    real hand shows through in passthrough and occludes virtual objects behind it. "Hand outline" toggles it.
  - removed the v0.5 throw / inertia (throwable, damping, settle); drags stop where you release.

  v0.5 changes (on top of v0.4)
  - input: sources without a gamepad (Vision Pro transient-pointer, gaze, screen taps) now select via the
    session's selectstart/selectend events; new source kind "pointer" (far-only, no device visual).
    Controllers also OR the session select events with the trigger, so a runtime that reports no
    gamepad.buttons still works.
  - interaction: sticky far hover (farExitScale) so small far targets stop flickering at the cone edge.
  - interaction: opts.precise = exact triangle raycast against the meshes (spheres no longer hit at box corners).
  - interaction: opts.constrain({position, quaternion, scale}) hook applied to drags and two-hand
    transforms (playground cubes cannot go below the table).
  - desktop: mouse wheel while ray-dragging = push / pull (mirrors the thumbstick); free wheel still orbits.
-->
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<div id="overlay">
 <main class="card">
  <header class="masthead"><span class="mark">Rongxuan Mu / Interactive Art</span><span class="edition">Immersive WebXR Gallery · 2026</span></header>
  <section class="hero">
   <div class="hero-copy"><p class="eyebrow">Art beyond the frame</p><h1>Immersive<br><em>Vibe</em></h1><p class="sub">Step into a painting.<br>Make it move.</p><p class="entry-note">Experience with an XR headset</p>
    <div class="row"><button id="enter-ar" disabled>Enter gallery ↗</button></div>
    <button id="sound" aria-pressed="true">Sound on · ambient &amp; interaction</button>
    <div id="status" role="status" aria-live="polite">Preparing the gallery…</div><div id="error" role="alert" hidden></div>
   </div>
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stroke="#4e6bce" stroke-width="0.87"/><path d="M176.69,178.61l-1.94,-3.76" stroke="#e8e379" stroke-width="1.39"/><path d="M558.11,140.86l1.61,2.59" stroke="#329de0" stroke-width="1.01"/><path d="M516.78,42.00l3.46,-0.95" stroke="#507aee" stroke-width="0.63"/><path d="M597.34,223.63l1.04,2.78" stroke="#6184d1" stroke-width="0.67"/><path d="M293.41,94.46l1.32,0.01" stroke="#5a62c2" stroke-width="1.11"/><path d="M557.38,175.21l0.97,3.82" stroke="#e1e047" stroke-width="1.08"/><path d="M523.77,75.96l3.60,0.82" stroke="#537fc9" stroke-width="0.58"/><path d="M299.88,145.91l2.22,0.48" stroke="#e9db53" stroke-width="0.36"/><path d="M486.92,268.40l-0.29,4.13" stroke="#408ac7" stroke-width="1.31"/><path d="M312.31,189.41l-2.48,-0.52" stroke="#2860d1" stroke-width="0.89"/><path d="M440.40,114.51l0.90,1.31" stroke="#4f77dd" stroke-width="0.84"/><path d="M368.09,108.05l2.06,1.78" stroke="#f1db3b" stroke-width="0.72"/><path d="M357.02,128.33l1.60,3.87" stroke="#6ca9eb" stroke-width="0.80"/><path d="M500.50,244.36l-0.24,1.70" stroke="#3584c8" stroke-width="0.74"/><path d="M589.88,80.36l2.60,0.39" stroke="#f4ed7f" stroke-width="1.27"/><path d="M340.65,117.40l3.16,2.95" stroke="#5696d5" stroke-width="0.55"/><path d="M74.02,117.80l-0.22,-2.51" stroke="#309ce2" stroke-width="0.45"/><path d="M209.82,76.54l1.57,-1.38" stroke="#f3eb7e" stroke-width="0.69"/><path d="M302.44,274.43l-1.64,1.63" stroke="#6592ea" stroke-width="1.41"/><path d="M74.81,108.34l-0.12,-3.32" stroke="#f6e542" stroke-width="1.29"/><path d="M480.04,131.19l0.52,1.34" stroke="#4e86c4" stroke-width="1.07"/><path d="M229.08,77.50l2.82,-1.89" stroke="#ecde72" stroke-width="1.04"/><path d="M639.71,148.18l3.35,2.79" stroke="#ede73f" stroke-width="0.89"/><path d="M210.20,188.53l-3.07,-3.58" stroke="#f6e06d" stroke-width="0.59"/></g></svg><div class="art-caption"><span>Gesture / pigment / presence</span><span>01 — 04</span></div></div>
  </section>
  <section class="worlds" aria-label="Four interactive worlds"><article><small>01</small><div><h2>The Starry Night</h2><p>Stir the sky</p></div></article><article><small>02</small><div><h2>Impression, Sunrise</h2><p>Touch the light</p></div></article><article><small>03</small><div><h2>Rivers and Mountains</h2><p>Part the mist</p></div></article><article><small>04</small><div><h2>Living Ink</h2><p>Draw a moving trail</p></div></article></section>
  <footer class="footer"><span>Created by <a href="https://www.linkedin.com/in/rongxuanmu/" target="_blank" rel="noopener">Rongxuan Mu ↗</a><br>Independent developer &amp; artist</span><span>Headset required<br>Hands, controllers &amp; gaze pointers</span></footer><div class="edition-note"><span id="ver"></span><span>© 2026 Rongxuan Mu</span></div>
 </main>
</div>

<script type="importmap">
{ "imports": {
  "three": "https://cdn.jsdelivr.net/npm/three@0.186.0/build/three.module.js",
  "three/examples/jsm/": "https://cdn.jsdelivr.net/npm/three@0.186.0/examples/jsm/"
} }
</script>
<script>window.__HAND_URL = "https://cdn.jsdelivr.net/npm/@webxr-input-profiles/assets@1.0.20/dist/profiles/generic-hand/";</script>
<script type="module">
// VibeXR Interaction Framework v0.6 - CodePen build (three.js r186 via import map in the HTML panel)
// src/main.js
import * as THREE7 from "three";
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";

// src/input.js
import * as THREE from "three";
var JOINTS = [
  "wrist",
  "thumb-metacarpal",
  "thumb-phalanx-proximal",
  "thumb-phalanx-distal",
  "thumb-tip",
  "index-finger-metacarpal",
  "index-finger-phalanx-proximal",
  "index-finger-phalanx-intermediate",
  "index-finger-phalanx-distal",
  "index-finger-tip",
  "middle-finger-metacarpal",
  "middle-finger-phalanx-proximal",
  "middle-finger-phalanx-intermediate",
  "middle-finger-phalanx-distal",
  "middle-finger-tip",
  "ring-finger-metacarpal",
  "ring-finger-phalanx-proximal",
  "ring-finger-phalanx-intermediate",
  "ring-finger-phalanx-distal",
  "ring-finger-tip",
  "pinky-finger-metacarpal",
  "pinky-finger-phalanx-proximal",
  "pinky-finger-phalanx-intermediate",
  "pinky-finger-phalanx-distal",
  "pinky-finger-tip"
];
var J = Object.fromEntries(JOINTS.map((n, i) => [n, i]));
var BONES = (() => {
  const b = [];
  const chains = [
    ["thumb-metacarpal", "thumb-phalanx-proximal", "thumb-phalanx-distal", "thumb-tip"],
    ...["index", "middle", "ring", "pinky"].map((f) => [
      `${f}-finger-metacarpal`,
      `${f}-finger-phalanx-proximal`,
      `${f}-finger-phalanx-intermediate`,
      `${f}-finger-phalanx-distal`,
      `${f}-finger-tip`
    ])
  ];
  for (const c of chains) {
    b.push([J.wrist, J[c[0]]]);
    for (let i = 0; i < c.length - 1; i++) b.push([J[c[i]], J[c[i + 1]]]);
  }
  b.push([J["index-finger-phalanx-proximal"], J["middle-finger-phalanx-proximal"]]);
  b.push([J["middle-finger-phalanx-proximal"], J["ring-finger-phalanx-proximal"]]);
  b.push([J["ring-finger-phalanx-proximal"], J["pinky-finger-phalanx-proximal"]]);
  return b;
})();
var CFG = {
  pinchOn: 0.018,
  // thumb\u2013index tip distance (m) to start a pinch
  pinchOff: 0.032,
  // \u2026and to release it (hysteresis)
  pinchFar: 0.06,
  // distance mapped to pinch value 0
  triggerOn: 0.55,
  triggerOff: 0.35,
  trackingGraceMs: 150,
  palmFacingDot: 0.72
};
var _v = new THREE.Vector3();
var _q = new THREE.Quaternion();
var _id = 0;
var Source = class {
  constructor(kind, handedness, inputSource = null) {
    this.id = `${kind}-${handedness}-${++_id}`;
    this.kind = kind;
    this.handedness = handedness;
    this.inputSource = inputSource;
    this.tracked = false;
    this.lastTrackedAt = 0;
    this.joints = JOINTS.map(() => ({ pos: new THREE.Vector3(), quat: new THREE.Quaternion(), radius: 8e-3, valid: false }));
    this.pinchValue = 0;
    this.pinchPoint = new THREE.Vector3();
    this.palmCenter = new THREE.Vector3();
    this.palmNormal = new THREE.Vector3(0, -1, 0);
    this.palmFacingHead = false;
    this.ray = { origin: new THREE.Vector3(), dir: new THREE.Vector3(0, 0, -1), quat: new THREE.Quaternion(), valid: false };
    this.grip = { pos: new THREE.Vector3(), quat: new THREE.Quaternion(), valid: false };
    this.pokePoint = new THREE.Vector3();
    this.nearPoint = new THREE.Vector3();
    this.nearQuat = new THREE.Quaternion();
    this.select = false;
    this.selectDown = false;
    this.selectUp = false;
    this.selectValue = 0;
    this.squeeze = 0;
    this.buttons = { a: false, b: false };
    this.buttonDown = { a: false, b: false };
    this.stick = new THREE.Vector2();
    this.gamepad = null;
    this.xrSelect = false;
    // from session selectstart / selectend (sources without a gamepad, e.g. Vision Pro transient-pointer)
    this.xrSqueeze = false;
    this.wheelStep = 0;
  }
  _setSelect(on) {
    this.selectDown = on && !this.select;
    this.selectUp = !on && this.select;
    this.select = on;
  }
  pulse(intensity = 0.3, ms = 20) {
    const h = this.gamepad?.hapticActuators?.[0];
    try {
      h?.pulse?.(intensity, ms);
    } catch (_) {
    }
  }
  updateFromFrame(frame, refSpace, head, now) {
    const is = this.inputSource;
    const rp = frame.getPose(is.targetRaySpace, refSpace);
    if (rp) {
      const t = rp.transform;
      this.ray.origin.set(t.position.x, t.position.y, t.position.z);
      this.ray.quat.set(t.orientation.x, t.orientation.y, t.orientation.z, t.orientation.w);
      this.ray.dir.set(0, 0, -1).applyQuaternion(this.ray.quat);
      this.ray.valid = true;
    } else this.ray.valid = false;
    if (is.gripSpace) {
      const gp = frame.getPose(is.gripSpace, refSpace);
      if (gp) {
        const t = gp.transform;
        this.grip.pos.set(t.position.x, t.position.y, t.position.z);
        this.grip.quat.set(t.orientation.x, t.orientation.y, t.orientation.z, t.orientation.w);
        this.grip.valid = true;
      } else this.grip.valid = false;
    }
    if (this.kind === "hand") this._updateHand(frame, refSpace, head, now);
    else if (this.kind === "pointer") this._updatePointer(now);
    else this._updateController(now);
  }
  _updateHand(frame, refSpace, head, now) {
    const hand = this.inputSource.hand;
    let ok = true;
    for (let i = 0; i < JOINTS.length; i++) {
      const space = hand.get(JOINTS[i]);
      const p = space ? frame.getJointPose(space, refSpace) : null;
      const j = this.joints[i];
      if (p) {
        const t = p.transform;
        j.pos.set(t.position.x, t.position.y, t.position.z);
        j.quat.set(t.orientation.x, t.orientation.y, t.orientation.z, t.orientation.w);
        j.radius = p.radius || 8e-3;
        j.valid = true;
      } else {
        j.valid = false;
        ok = false;
      }
    }
    if (ok) {
      this.tracked = true;
      this.lastTrackedAt = now;
    } else if (now - this.lastTrackedAt > CFG.trackingGraceMs) this.tracked = false;
    if (!ok) {
      this._setSelect(this.tracked ? this.select : false);
      return;
    }
    const thumb = this.joints[J["thumb-tip"]].pos, index = this.joints[J["index-finger-tip"]].pos;
    const d = thumb.distanceTo(index);
    this.pinchValue = THREE.MathUtils.clamp(1 - (d - CFG.pinchOn) / (CFG.pinchFar - CFG.pinchOn), 0, 1);
    this.pinchPoint.lerpVectors(thumb, index, 0.5);
    this._setSelect(this.select ? d < CFG.pinchOff : d < CFG.pinchOn);
    this.selectValue = this.pinchValue;
    const mid = this.joints[J["middle-finger-metacarpal"]];
    this.palmCenter.lerpVectors(this.joints[J.wrist].pos, this.joints[J["middle-finger-phalanx-proximal"]].pos, 0.55);
    this.palmNormal.set(0, -1, 0).applyQuaternion(mid.quat);
    _v.copy(head).sub(this.palmCenter).normalize();
    this.palmFacingHead = this.palmNormal.dot(_v) > CFG.palmFacingDot;
    this.pokePoint.copy(index);
    this.nearPoint.copy(this.pinchPoint);
    this.nearQuat.copy(this.grip.valid ? this.grip.quat : this.joints[J.wrist].quat);
  }
  _updateController(now) {
    const gp = this.inputSource.gamepad;
    this.gamepad = gp;
    this.tracked = this.ray.valid;
    if (this.tracked) this.lastTrackedAt = now;
    const bv = (i) => gp && gp.buttons[i] ? gp.buttons[i].value : 0;
    const bp = (i) => !!(gp && gp.buttons[i] && gp.buttons[i].pressed);
    this.selectValue = gp && gp.buttons.length ? bv(0) : this.xrSelect ? 1 : 0;
    const trig = gp && gp.buttons.length ? this.select ? this.selectValue > CFG.triggerOff : this.selectValue > CFG.triggerOn : false;
    this._setSelect(trig || this.xrSelect);
    this.squeeze = gp && gp.buttons.length > 1 ? bv(1) : this.xrSqueeze ? 1 : 0;
    for (const [k, i] of [["a", 4], ["b", 5]]) {
      const on = bp(i);
      this.buttonDown[k] = on && !this.buttons[k];
      this.buttons[k] = on;
    }
    if (gp && gp.axes.length >= 4) this.stick.set(gp.axes[2], gp.axes[3]);
    else this.stick.set(0, 0);
    this.pokePoint.copy(this.ray.dir).multiplyScalar(0.02).add(this.ray.origin);
    this.nearPoint.copy(this.pokePoint);
    this.nearQuat.copy(this.ray.quat);
  }
  // Gaze / transient pointers (Vision Pro Safari, screen taps): ray only, select from session events.
  _updatePointer(now) {
    this.gamepad = null;
    this.tracked = this.ray.valid;
    if (this.tracked) this.lastTrackedAt = now;
    this._setSelect(this.xrSelect);
    this.selectValue = this.select ? 1 : 0;
    this.squeeze = this.xrSqueeze ? 1 : 0;
    this.pokePoint.copy(this.ray.origin);
    this.nearPoint.copy(this.ray.origin);
    this.nearQuat.copy(this.ray.quat);
  }
};
var InputSystem = class {
  constructor() {
    this.sources = /* @__PURE__ */ new Map();
    this.head = new THREE.Vector3(0, 1.6, 0);
    this.headQuat = new THREE.Quaternion();
    this.onAdd = null;
    this.onRemove = null;
  }
  list() {
    return [...this.sources.values()];
  }
  // Session select / squeeze events. Needed for sources without a gamepad; also a fallback for controllers.
  // A transient pointer can fire selectstart in the same frame it appears, so create the Source here if needed.
  _attach(session) {
    if (this._session === session) return;
    this._session = session;
    const set = (k, v) => (e) => {
      const s = this._source(e.inputSource);
      if (s) s[k] = v;
    };
    session.addEventListener("selectstart", set("xrSelect", true));
    session.addEventListener("selectend", set("xrSelect", false));
    session.addEventListener("squeezestart", set("xrSqueeze", true));
    session.addEventListener("squeezeend", set("xrSqueeze", false));
  }
  _source(is) {
    if (!is) return null;
    let s = this.sources.get(is);
    if (!s) {
      const kind = is.hand ? "hand" : is.targetRayMode === "tracked-pointer" ? "controller" : "pointer";
      s = new Source(kind, is.handedness, is);
      this.sources.set(is, s);
      this.onAdd?.(s);
    }
    return s;
  }
  update(frame, refSpace, now) {
    this._attach(frame.session);
    const vp = frame.getViewerPose(refSpace);
    if (vp) {
      const t = vp.transform;
      this.head.set(t.position.x, t.position.y, t.position.z);
      this.headQuat.set(t.orientation.x, t.orientation.y, t.orientation.z, t.orientation.w);
    }
    const seen = /* @__PURE__ */ new Set();
    for (const is of frame.session.inputSources) {
      seen.add(is);
      const s = this._source(is);
      s.updateFromFrame(frame, refSpace, this.head, now);
    }
    for (const [is, s] of this.sources) {
      if (!seen.has(is)) {
        this.sources.delete(is);
        s.tracked = false;
        this.onRemove?.(s);
      }
    }
  }
  clear() {
    for (const s of this.sources.values()) this.onRemove?.(s);
    this.sources.clear();
    this._session = null;
  }
};
var MouseSource = class extends Source {
  constructor(camera, dom) {
    super("mouse", "none");
    this.camera = camera;
    this.ndc = new THREE.Vector2(0, 0);
    this.down = false;
    this.inside = false;
    this.raycaster = new THREE.Raycaster();
    dom.addEventListener("pointermove", (e) => {
      const r = dom.getBoundingClientRect();
      this.ndc.set((e.clientX - r.left) / r.width * 2 - 1, -((e.clientY - r.top) / r.height) * 2 + 1);
      this.inside = true;
    });
    dom.addEventListener("pointerleave", () => {
      this.inside = false;
      this.down = false;
    });
    dom.addEventListener("pointerdown", (e) => {
      if (e.button === 0) this.down = true;
    });
    window.addEventListener("pointerup", (e) => {
      if (e.button === 0) this.down = false;
    });
    // wheel while the left button is held = push / pull along the ray (mirrors the thumbstick);
    // capture phase so OrbitControls' own wheel listener never sees it. A free wheel still dollies the orbit.
    this.wheelAcc = 0;
    dom.addEventListener("wheel", (e) => {
      if (!this.down) return;
      e.preventDefault();
      e.stopImmediatePropagation();
      this.wheelAcc += -Math.sign(e.deltaY) * (Math.abs(e.deltaY) >= 40 ? 1 : 0.25);
    }, { passive: false, capture: true });
  }
  update(now) {
    this.wheelStep = this.wheelAcc;
    this.wheelAcc = 0;
    this.tracked = this.inside;
    this.raycaster.setFromCamera(this.ndc, this.camera);
    this.ray.origin.copy(this.raycaster.ray.origin);
    this.ray.dir.copy(this.raycaster.ray.direction);
    _q.setFromUnitVectors(_v.set(0, 0, -1), this.ray.dir);
    this.ray.quat.copy(_q);
    this.ray.valid = true;
    this._setSelect(this.down && this.inside);
    this.selectValue = this.select ? 1 : 0;
  }
};

// src/interaction.js
import * as THREE2 from "three";
import { mergeVertices } from "three/examples/jsm/utils/BufferGeometryUtils.js";
var ICFG = {
  nearRadiusHand: 0.05,
  nearRadiusController: 0.06,
  nearExitScale: 1.6,
  // hover hysteresis: keep a near target until 1.6\u00d7 the radius
  outlinePx: 4,
  // thickness of the white hover outline, in CSS pixels on desktop / eye-buffer pixels in XR (~0.1 deg either way)
  outlinePxSelect: 7,
  // ...and while pressed / held
  nearCentroidWeight: 0.5,
  // near ranking: score = surface distance + weight x centroid distance; the lowest score is the one hovered target
  farExitScale: 1.25,
  // far hover hysteresis: the current far target is kept until 1.25\u00d7 the cone angle (1\u00b0 \u2192 1.25\u00b0, i.e. 2.5\u00b0 diameter max)
  selectGraceMs: 160,
  // a pinch that closes just after hover was lost still grabs it
  pokeHover: 0.06,
  // m in front of a surface where poke hover starts
  pokePress: 8e-3,
  // penetration to fire press
  pokeRelease: 4e-3,
  // penetration to release (hysteresis)
  pokeMaxDepth: 0.04,
  // beyond this the finger has "gone through"
  pokeMargin: 4e-3,
  // lateral slack around a surface
  // cone angles are HALF-angles measured from the ray to the target's silhouette (diameter = 2x)
  coneAngleHand: THREE2.MathUtils.degToRad(1),
  coneAngleController: THREE2.MathUtils.degToRad(1),
  coneAngleMouse: THREE2.MathUtils.degToRad(1.5),
  maxRayDistance: 12,
  cursorStateSmoothing: 12,
  // 1/s: how fast the ray / cursor blend between idle, hover and select looks
  tapMaxMs: 550,
  longPressMs: 650,
  longPressShowMs: 180,
  dragNear: 0.015,
  dragFarAngle: THREE2.MathUtils.degToRad(2.2),
  cursorConeAngle: THREE2.MathUtils.degToRad(10),
  // half-angle of the (larger) depth-detection cone: targets inside it set the cursor depth by inverse-square
  // angular weighting; when nothing is inside, the cursor keeps its previous depth
  cursorDefaultDepth: 0.9,
  // m: initial cursor depth before anything has been detected
  cursorSmoothing: 16,
  // 1/s: temporal solver on top of the spatial depth - exponential follow rate (visual only)
  cursorMaxSpeed: 5,
  // m/s: cap on how fast the visual cursor depth may change (a 2.5 m jump takes ~0.5 s; small shifts follow the exponential)
  minScale: 0.25,
  maxScale: 4,
  pushPullSpeed: 1.5,
  // m/s with thumbstick during far drag
  // Far-drag "hand feel": gain only along the aim direction (push / pull). Rotation stays 1:1.
  // Applied to hands and controllers, not the mouse.
  farGain: {
    enabled: true,
    depth: true,
    // Distance gain: object distance scales multiplicatively with hand reach along the aim ray,
    // so the same hand travel moves a far object more than a near one (HOMER-like).
    reachRef: 0.45,
    // m of (effective) hand travel that doubles the grab distance, before the exponent
    depthExponent: 1.25,
    // >1 = stronger push / pull for the same reach
    depthDeadzone: 0.015,
    // m; ignore small wobble along the ray while aiming
    // Speed gain on that same axis: slow push = precise, fast push = throws further.
    speedMin: 1,
    // gain at or below vLow
    speedMax: 2.5,
    // gain at or above vHigh
    vLow: 0.6,
    // m/s of hand speed along the aim ray below which there is no speed gain
    vHigh: 1.8,
    // m/s at which the full speed gain applies (only genuinely fast pushes / pulls)
    smoothing: 14,
    // no minimum hold distance: a far grab keeps the exact distance it was picked at (no jump on close targets)
    // 1/s, how fast the speed gain follows (avoids jumps)
    minDistance: 0
  }
};
var _v1 = new THREE2.Vector3();
var _v2 = new THREE2.Vector3();
var _v3 = new THREE2.Vector3();
var _m1 = new THREE2.Matrix4();
var _m2 = new THREE2.Matrix4();
var _q1 = new THREE2.Quaternion();
var _ray = new THREE2.Ray();
var _box = new THREE2.Box3();
var _rc = new THREE2.Raycaster();
var _cp = new THREE2.Vector3();
var _cq = new THREE2.Quaternion();
var _cs = new THREE2.Vector3();
// White hover outline: an inverted hull (back faces) pushed outward in SCREEN space, away from the object's
// projected centre, by a fixed number of pixels - so the line is the same thickness at any distance or object
// scale and never tears at corners (expanding a box along its split face normals opened gaps at every corner).
// The direction is normalised in PIXEL space (not NDC, which is anisotropic), so the push is exactly N px.
// The hull still uses a merged-vertex copy so the silhouette is watertight.
function outlineGeometry(geo) {
  if (geo.userData.vxrHull) return geo.userData.vxrHull;
  let g = geo;
  try {
    g = mergeVertices(geo.clone());
    g.computeVertexNormals();
  } catch (_) {
    g = geo;
  }
  geo.userData.vxrHull = g;
  return g;
}
function hoverOutlineMaterial() {
  const m = new THREE2.MeshBasicMaterial({ color: 16777215, side: THREE2.BackSide, transparent: true, opacity: 0.9, depthWrite: false });
  m.userData.px = { value: ICFG.outlinePx };
  m.userData.viewport = { value: new THREE2.Vector2(1024, 1024) };
  m.onBeforeCompile = (sh) => {
    sh.uniforms.uOutlinePx = m.userData.px;
    sh.uniforms.uViewport = m.userData.viewport;
    sh.vertexShader = "uniform float uOutlinePx;\nuniform vec2 uViewport;\n" + sh.vertexShader.replace(
      "#include <project_vertex>",
      "#include <project_vertex>\n vec4 vxrC = projectionMatrix * modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );\n vec2 vxrD = ( gl_Position.xy / gl_Position.w - vxrC.xy / vxrC.w ) * uViewport;\n if ( length( vxrD ) > 1e-6 ) gl_Position.xy += normalize( vxrD ) * uOutlinePx * 2.0 * gl_Position.w / uViewport;"
    );
  };
  m.customProgramCacheKey = () => "vxr-hover-outline";
  return m;
}
// the clip-space offset needs the pixel size of the viewport being drawn (per eye in XR)
function outlineHull(sourceMesh, mat) {
  const hull = new THREE2.Mesh(outlineGeometry(sourceMesh.geometry), mat);
  hull.userData.isOutline = hull.userData.noCollider = hull.userData.noHighlight = true;
  // no renderOrder: the hull sits at the object's own depth, so plain distance sorting puts it in front of
  // whatever is behind the object and behind whatever is in front of it.
  hull.frustumCulled = false;
  hull.visible = false;
  hull.onBeforeRender = (renderer, scene, camera) => {
    const vp = camera.viewport;
    // XR: this eye's viewport in render-target pixels. Desktop: CSS pixels (not the device-pixel buffer),
    // so the thickness matches what the label says on a HiDPI screen.
    if (vp) mat.userData.viewport.value.set(vp.z, vp.w);
    else renderer.getSize(mat.userData.viewport.value);
  };
  return hull;
}
var Interactable = class _Interactable {
  /**
   * @param {THREE.Object3D} object
   * @param {object} opts
   *  near, far        : accept Near / Far interactors (default true)
   *  poke             : null | 'surface' | 'volume'
   *  draggable        : move with the selector while dragging (default false)
   *  twoHand          : rotate + scale with two selectors (default false)
   *  longPress        : show the long-press ring (default: true if a listener exists)
   *  box              : THREE.Box3 in object-local space (auto from geometry)
   *  highlight        : default emissive feedback (default true)
   *  onPokeDepth(d)   : callback with poke penetration (for button travel)
   *  precise          : exact triangle raycast for far hover (default false = bounding box)
   *  constrain(t, it) : t = {position, quaternion, scale} in world space, mutate to constrain any transform
   *  multi            : accept any number of simultaneous selections as independent presses (no two-hand transform)
   *  translateOnly    : a drag moves the object with the selector but never rotates it (default false)
   */
  constructor(object, opts = {}) {
    this.object = object;
    this.opts = Object.assign({ near: true, far: true, poke: null, draggable: false, twoHand: false, highlight: true }, opts);
    this.enabled = true;
    this.listeners = {};
    this.hoverers = /* @__PURE__ */ new Set();
    this.selections = [];
    this.localBox = opts.box ? opts.box.clone() : computeLocalBox(object);
    this._outline = null;
    this._outlineMat = null;
    this._level = 0;
    object.userData.interactable = this;
  }
  on(type, fn) {
    (this.listeners[type] ||= []).push(fn);
    return this;
  }
  off(type, fn) {
    const l = this.listeners[type];
    if (l) this.listeners[type] = l.filter((f) => f !== fn);
    return this;
  }
  has(type) {
    return !!(this.listeners[type] && this.listeners[type].length);
  }
  emit(type, e = {}) {
    e.type = type;
    e.target = this;
    for (const fn of this.listeners[type] || []) {
      try {
        fn(e);
      } catch (err) {
        console.error(err);
      }
    }
    _Interactable.onAny?.(e);
  }
  get wantsLongPress() {
    return this.opts.longPress ?? this.has("longpress");
  }
  get isVisible() {
    let o = this.object;
    while (o) {
      if (!o.visible) return false;
      o = o.parent;
    }
    return true;
  }
  // - geometry queries (world space) -
  worldCenter(out) {
    return this.localBox.getCenter(out).applyMatrix4(this.object.matrixWorld);
  }
  worldRadius() {
    this.localBox.getSize(_v1);
    this.object.getWorldScale(_v2);
    return 0.5 * Math.hypot(_v1.x * _v2.x, _v1.y * _v2.y, _v1.z * _v2.z);
  }
  closestPoint(p, out) {
    _m1.copy(this.object.matrixWorld).invert();
    out.copy(p).applyMatrix4(_m1);
    this.localBox.clampPoint(out, out);
    return out.applyMatrix4(this.object.matrixWorld);
  }
  distanceTo(p) {
    return this.closestPoint(p, _v3).distanceTo(p);
  }
  raycast(origin, dir) {
    _m1.copy(this.object.matrixWorld).invert();
    _ray.origin.copy(origin).applyMatrix4(_m1);
    _ray.direction.copy(dir).transformDirection(_m1);
    const hit = _ray.intersectBox(this.localBox, _v1);
    if (!hit) return null;
    if (this.opts.precise) {
      _rc.set(origin, dir);
      const h = _rc.intersectObject(this.object, true).find((x) => x.object.visible && !x.object.userData.noCollider);
      return h ? { point: h.point.clone(), distance: h.distance } : null;
    }
    hit.applyMatrix4(this.object.matrixWorld);
    return { point: hit.clone(), distance: hit.distanceTo(origin) };
  }
  // Poke surface = local +Z face of the box. Returns {depth, point(world on surface), inside}
  pokeQuery(p, out) {
    _m1.copy(this.object.matrixWorld).invert();
    _v1.copy(p).applyMatrix4(_m1);
    const b = this.localBox;
    this.object.getWorldScale(_v2);
    const m = ICFG.pokeMargin;
    const inside = _v1.x >= b.min.x - m / _v2.x && _v1.x <= b.max.x + m / _v2.x && _v1.y >= b.min.y - m / _v2.y && _v1.y <= b.max.y + m / _v2.y;
    out.depth = (_v1.z - b.max.z) * _v2.z;
    out.inside = inside;
    out.point = (out.point || new THREE2.Vector3()).set(
      THREE2.MathUtils.clamp(_v1.x, b.min.x, b.max.x),
      THREE2.MathUtils.clamp(_v1.y, b.min.y, b.max.y),
      b.max.z
    ).applyMatrix4(this.object.matrixWorld);
    out.normal = (out.normal || new THREE2.Vector3()).set(0, 0, 1).transformDirection(this.object.matrixWorld);
    return out;
  }
  // - default visual feedback -
  setLevel(level) {
    if (this._level === level) return;
    this._level = level;
    this.emit("statechange", { level });
    if (!this.opts.highlight) return;
    if (!this._outline) {
      // build the hulls once: one per mesh, parented to that mesh at identity so it follows every transform
      this._outline = [];
      this._outlineMat = hoverOutlineMaterial();
      const parts = [];
      this.object.traverse((o) => {
        if (o.isMesh && o.geometry && !o.userData.noHighlight && !o.userData.noCollider && !o.userData.isOutline) parts.push(o);
      });
      for (const o of parts) {
        const hull = outlineHull(o, this._outlineMat);
        o.add(hull);
        this._outline.push(hull);
      }
    }
    for (const h of this._outline) h.visible = level > 0;
    this._outlineMat.userData.px.value = level === 2 ? ICFG.outlinePxSelect : ICFG.outlinePx;
    this._outlineMat.opacity = level === 2 ? 1 : 0.85;
  }

};
function computeLocalBox(object) {
  object.updateMatrixWorld(true);
  const inv = new THREE2.Matrix4().copy(object.matrixWorld).invert();
  const box = new THREE2.Box3();
  object.traverse((o) => {
    if (!o.isMesh || !o.geometry || o.userData.noCollider) return;
    if (!o.geometry.boundingBox) o.geometry.computeBoundingBox();
    _box.copy(o.geometry.boundingBox).applyMatrix4(_m2.multiplyMatrices(inv, o.matrixWorld));
    box.union(_box);
  });
  if (box.isEmpty()) box.setFromCenterAndSize(new THREE2.Vector3(), new THREE2.Vector3(0.05, 0.05, 0.05));
  return box;
}
var Interactor = class {
  constructor(type, source) {
    this.type = type;
    this.source = source;
    this.hover = null;
    this.hoverPoint = new THREE2.Vector3();
    this.hoverDistance = 0;
    this.selecting = null;
    this.active = false;
    this.attach = new THREE2.Vector3();
  }
};
var InteractorGroup = class {
  constructor(source) {
    this.source = source;
    this.poke = new Interactor("poke", source);
    this.near = new Interactor("near", source);
    this.far = new Interactor("far", source);
    this.list = [this.poke, this.near, this.far];
    this.active = null;
    this.blocked = false;
    this.pokeState = { target: null, armed: false, pressed: false, depth: 1, q: {} };
    this.farDistance = 0;
    this.farAngle = 0;
  }
  get selecting() {
    return this.list.find((i) => i.selecting)?.selecting || null;
  }
};
var Selection = class {
  constructor(interactor, target, now) {
    this.interactor = interactor;
    this.target = target;
    this.t0 = now;
    this.p0 = interactor.attach.clone();
    this.dir0 = interactor.source.ray.dir.clone();
    this.dragging = false;
    this.longFired = false;
    this.offset = new THREE2.Matrix4();
    this.farDist = 0;
    this.vq = interactor.source.ray.quat.clone();
    this.d0 = 0;
    this.poseDist = 0;
    this.stick = 0;
    this.lastHand = null;
    this.reach = 0;
    this.gain = 1;
    this.peakGain = 1;
  }
};
var InteractionManager = class {
  constructor() {
    this.interactables = /* @__PURE__ */ new Set();
    this.groups = /* @__PURE__ */ new Map();
    this.twoHand = /* @__PURE__ */ new Map();
    this.now = 0;
  }
  add(obj, opts) {
    const it = obj instanceof Interactable ? obj : new Interactable(obj, opts);
    this.interactables.add(it);
    return it;
  }
  remove(it) {
    if (!it) return;
    for (const s of [...it.selections]) this._endSelection(s, true);
    for (const g of this.groups.values()) for (const i of g.list) if (i.hover === it) this._setHover(i, null);
    this.interactables.delete(it);
  }
  addSource(src) {
    const g = new InteractorGroup(src);
    this.groups.set(src, g);
    return g;
  }
  removeSource(src) {
    const g = this.groups.get(src);
    if (!g) return;
    for (const i of g.list) {
      if (i.selecting) this._endSelection(i.selecting, true);
      this._setHover(i, null);
    }
    this.groups.delete(src);
  }
  group(src) {
    return this.groups.get(src);
  }
  update(dt, now, head) {
    this.now = now;
    if (head) this.head = head;
    for (const it of this.interactables) it.object.updateMatrixWorld();
    for (const g of this.groups.values()) this._updateGroup(g, dt, now);
    this._updateTwoHand();
    for (const it of this.interactables) it.setLevel(it.selections.length ? 2 : it.hoverers.size ? 1 : 0);
  }
  _candidates(filter) {
    const out = [];
    for (const it of this.interactables) if (it.enabled && filter(it) && it.isVisible) out.push(it);
    return out;
  }
  _updateGroup(g, dt, now) {
    const src = g.source;
    const usable = src.tracked && !g.blocked;
    if (!usable) {
      for (const i of g.list) {
        if (i.selecting) this._endSelection(i.selecting, true);
        this._setHover(i, null);
        i.active = false;
      }
      g.active = null;
      g.pokeState.target = null;
      g.pokeState.armed = false;
      g.pokeState.pressed = false;
      return;
    }
    const sel = g.selecting;
    if (sel) {
      const i = sel.interactor;
      if (i.type === "far") this._updateFarGain(sel, dt);
      this._updateAttach(i, sel);
      if (i.type === "poke") this._pokeStep(g, now);
      else if (src.selectUp || !src.select) this._endSelection(sel, false);
      else this._updateSelection(sel, dt, now);
      for (const o of g.list) o.active = o === i;
      g.active = i;
      return;
    }
    const farOnly = src.kind === "mouse" || src.kind === "pointer";
    const pokeHit = farOnly ? null : this._pokeStep(g, now);
    if (pokeHit) {
      this._setHover(g.near, null);
      this._setHover(g.far, null);
      this._activate(g, g.poke);
      return;
    }
    this._setHover(g.poke, null);
    let nearT = null, nearD = Infinity;
    if (!farOnly) {
      // near hover = the direct-interaction region. Exactly one target: candidates within the radius are ranked
      // by surface distance + nearCentroidWeight x centroid distance (intention: the object whose body the hand
      // is closest to wins ties at equal surface distance); the current target keeps a hysteresis radius.
      // Whether the ray shows follows from this alone: near target hovered -> ray hidden, none -> ray shown.
      const r = src.kind === "hand" ? ICFG.nearRadiusHand : ICFG.nearRadiusController;
      let nearScore = Infinity;
      for (const it of this._candidates((it2) => it2.opts.near && it2.opts.poke !== "volume")) {
        const d = it.distanceTo(src.nearPoint);
        const lim = it === g.near.hover ? r * ICFG.nearExitScale : r;
        if (d >= lim) continue;
        const score = d + ICFG.nearCentroidWeight * it.worldCenter(_v1).distanceTo(src.nearPoint);
        if (score < nearScore) {
          nearScore = score;
          nearD = d;
          nearT = it;
        }
      }
      if (nearT) {
        g.lastNear = nearT;
        g.lastNearAt = now;
      } else if (src.selectDown && g.lastNear && now - g.lastNearAt < ICFG.selectGraceMs && this.interactables.has(g.lastNear) && g.lastNear.enabled) {
        nearT = g.lastNear;
        nearD = nearT.distanceTo(src.nearPoint);
      }
    }
    if (nearT) {
      this._setHover(g.far, null);
      this._setHover(g.near, nearT);
      nearT.closestPoint(src.nearPoint, g.near.hoverPoint);
      g.near.hoverDistance = nearD;
      g.near.attach.copy(src.nearPoint);
      this._activate(g, g.near);
      if (src.selectDown) this._beginSelection(g.near, nearT, now);
      return;
    }
    this._setHover(g.near, null);
    if (!src.ray.valid || src.kind === "hand" && src.palmFacingHead) {
      this._setHover(g.far, null);
      this._activate(g, null);
      return;
    }
    const cone = src.kind === "hand" || src.kind === "pointer" ? ICFG.coneAngleHand : src.kind === "mouse" ? ICFG.coneAngleMouse : ICFG.coneAngleController;
    const hit = this._coneCast(src.ray.origin, src.ray.dir, cone, g.far.hover);
    g.cursorDepth = this._cursorDepth(src.ray.origin, src.ray.dir, hit);
    this._activate(g, g.far);
    if (hit) {
      this._setHover(g.far, hit.target);
      g.far.hoverPoint.copy(hit.point);
      g.far.hoverDistance = hit.distance;
      g.far.attach.copy(hit.point);
      g.farDistance = hit.distance;
      if (src.selectDown) this._beginSelection(g.far, hit.target, now);
    } else {
      this._setHover(g.far, null);
      g.farDistance = 0;
    }
  }
  _activate(g, i) {
    g.active = i;
    for (const o of g.list) o.active = o === i;
  }
  // Exact ray hit first; fall back to the smallest angular miss inside the cone.
  // `keep` (the current far hover) stays selected while it is within farExitScale x the cone (hysteresis).
  _coneCast(origin, dir, cone, keep = null) {
    const cands = this._candidates((it) => it.opts.far);
    let best = null;
    for (const it of cands) {
      const h = it.raycast(origin, dir);
      if (h && h.distance <= ICFG.maxRayDistance && (!best || h.distance < best.distance)) best = { target: it, point: h.point, distance: h.distance };
    }
    if (best) return best;
    let bestAng = cone, kept = null;
    for (const it of cands) {
      const c = it.worldCenter(_v1);
      _v2.copy(c).sub(origin);
      const t = _v2.dot(dir);
      if (t < 0.1 || t > ICFG.maxRayDistance) continue;
      const perp = _v2.addScaledVector(dir, -t).length();
      const ang = Math.atan2(Math.max(0, perp - it.worldRadius()), t);
      const isKeep = it === keep;
      if (ang < (isKeep ? cone * ICFG.farExitScale : bestAng)) {
        const onRay = _v3.copy(dir).multiplyScalar(t).add(origin);
        const p = it.closestPoint(onRay, new THREE2.Vector3());
        const r = { target: it, point: p, distance: p.distanceTo(origin) };
        if (isKeep) kept = r;
        else {
          bestAng = ang;
          best = r;
        }
      }
    }
    return kept || best;
  }
  // Spatial cursor depth from a second, larger cone (cursorConeAngle, independent of the selection cone):
  // inverse-square weighting of every far candidate by its angular distance from the ray (Shepard
  // interpolation), tapered to zero at the cone edge. Exact on a target (weight -> infinity at angle 0),
  // symmetric and continuous between targets. Returns null when nothing is inside the cone, and the
  // visual cursor then simply keeps its previous depth. A pure function of the ray pose - no time term.
  _cursorDepth(origin, dir, hit) {
    const cut = ICFG.cursorConeAngle;
    let sw = 0, sd = 0;
    for (const it of this._candidates((it2) => it2.opts.far)) {
      const c = it.worldCenter(_v1);
      _v2.copy(c).sub(origin);
      const t = _v2.dot(dir);
      if (t < 0.1 || t > ICFG.maxRayDistance) continue;
      const perp = _v2.addScaledVector(dir, -t).length();
      const ang = Math.atan2(Math.max(0, perp - it.worldRadius()), t);
      if (ang >= cut) continue;
      const isHit = !!hit && hit.target === it;
      let d;
      if (isHit) d = hit.distance;
      else {
        _v3.copy(dir).multiplyScalar(t).add(origin);
        d = it.closestPoint(_v3, _v3).distanceTo(origin);
      }
      if (ang < 1e-4) return d;
      const taper = 1 - ang / cut;
      const w = taper * taper / (ang * ang);
      sw += w;
      sd += w * d;
    }
    return sw > 0 ? sd / sw : null;
  }
  // opts.constrain hook: decompose the world matrix, let the object clamp it, recompose.
  _constrain(it, m) {
    const fn = it.opts.constrain;
    if (!fn) return m;
    m.decompose(_cp, _cq, _cs);
    fn({ position: _cp, quaternion: _cq, scale: _cs }, it);
    return m.compose(_cp, _cq, _cs);
  }
  // Poke evaluation. Returns true if the poke interactor owns the group this frame.
  _pokeStep(g, now) {
    const src = g.source, ps = g.pokeState, P = src.pokePoint;
    const q = ps.q;
    if (ps.target) {
      const it = ps.target;
      const alive = it.enabled && it.isVisible && this.interactables.has(it);
      let keep = false;
      if (alive && it.opts.poke === "surface") {
        it.pokeQuery(P, q);
        keep = (q.inside || ps.pressed) && q.depth < ICFG.pokeHover && q.depth > -ICFG.pokeMaxDepth && (ps.armed || q.depth >= 0);
        if (keep) {
          if (q.depth >= 0) ps.armed = true;
          ps.depth = q.depth;
          g.poke.hoverPoint.copy(q.point);
          it.opts.onPokeDepth?.(Math.max(0, -q.depth));
          if (!ps.pressed && ps.armed && q.depth < -ICFG.pokePress) {
            ps.pressed = true;
            g.poke.attach.copy(q.point);
            this._beginSelection(g.poke, it, now);
            src.pulse(0.5, 25);
          } else if (ps.pressed && q.depth > -ICFG.pokeRelease) {
            ps.pressed = false;
            if (g.poke.selecting) this._endSelection(g.poke.selecting, false);
          } else if (ps.pressed && g.poke.selecting) {
            g.poke.attach.copy(q.point);
            this._updateSelection(g.poke.selecting, 0, now);
          }
        }
      } else if (alive && it.opts.poke === "volume") {
        const d = it.distanceTo(P);
        keep = d < ICFG.pokeHover;
        if (keep) {
          ps.depth = d;
          it.closestPoint(P, g.poke.hoverPoint);
          if (!ps.pressed && d <= 5e-4) {
            ps.pressed = true;
            g.poke.attach.copy(P);
            this._beginSelection(g.poke, it, now);
            src.pulse(0.5, 25);
          } else if (ps.pressed && d > 6e-3) {
            ps.pressed = false;
            if (g.poke.selecting) this._endSelection(g.poke.selecting, false);
          } else if (ps.pressed && g.poke.selecting) {
            g.poke.attach.copy(P);
            this._updateSelection(g.poke.selecting, 0, now);
          }
        }
      }
      if (keep) {
        this._setHover(g.poke, it);
        return true;
      }
      if (g.poke.selecting) this._endSelection(g.poke.selecting, !ps.pressed);
      it.opts.onPokeDepth?.(0);
      ps.target = null;
      ps.armed = false;
      ps.pressed = false;
    }
    let best = null, bestD = Infinity;
    for (const it of this._candidates((it2) => !!it2.opts.poke)) {
      if (it.opts.poke === "surface") {
        it.pokeQuery(P, q);
        if (q.inside && q.depth >= 0 && q.depth < ICFG.pokeHover && q.depth < bestD) {
          bestD = q.depth;
          best = it;
        }
      } else {
        const d = it.distanceTo(P);
        if (d > 5e-4 && d < ICFG.pokeHover && d < bestD) {
          bestD = d;
          best = it;
        }
      }
    }
    if (!best) return false;
    ps.target = best;
    ps.armed = true;
    ps.pressed = false;
    ps.depth = bestD;
    if (best.opts.poke === "surface") {
      best.pokeQuery(P, q);
      g.poke.hoverPoint.copy(q.point);
    } else best.closestPoint(P, g.poke.hoverPoint);
    this._setHover(g.poke, best);
    return true;
  }
  _setHover(i, it) {
    if (i.hover === it) return;
    const prev = i.hover;
    i.hover = it;
    if (prev) {
      prev.hoverers.delete(i);
      if (prev.hoverers.size === 0) prev.emit("hoverexit", { interactor: i });
    }
    if (it) {
      const first = it.hoverers.size === 0;
      it.hoverers.add(i);
      if (first) it.emit("hoverenter", { interactor: i });
      i.source.pulse(0.12, 12);
    }
  }
  _selectorPose(i, out) {
    const s = i.source;
    if (i.type === "far") {
      const sel = i.selecting;
      if (!sel) return out.compose(s.ray.origin, s.ray.quat, _v3.set(1, 1, 1));
      out.compose(s.ray.origin, sel.vq, _v3.set(1, 1, 1));
      return out.multiply(_m2.makeTranslation(0, 0, -(sel.farDist - sel.poseDist)));
    }
    if (i.type === "poke") return out.compose(i.attach, s.nearQuat, _v3.set(1, 1, 1));
    return out.compose(s.nearPoint, s.nearQuat, _v3.set(1, 1, 1));
  }
  _updateAttach(i, sel) {
    const s = i.source;
    if (i.type === "near") i.attach.copy(s.nearPoint);
    else if (i.type === "far") i.attach.set(0, 0, -sel.farDist).applyQuaternion(sel.vq).add(s.ray.origin);
  }
  // Hand position used for reach (grip / wrist for hands, ray origin for controllers).
  _handPoint(src) {
    return src.kind === "hand" ? src.grip.valid ? src.grip.pos : src.joints[0].pos : src.ray.origin;
  }
  // Aim-axis gain for far manipulation, integrated every frame of a far selection:
  // hand motion projected on the current aim direction, amplified by its speed (speed gain),
  // then mapped multiplicatively onto the grab distance (distance gain). Rotation is 1:1.
  _updateFarGain(sel, dt) {
    const s = sel.interactor.source, G = ICFG.farGain;
    sel.vq.copy(s.ray.quat);
    const useGain = G.enabled && G.depth && s.kind !== "mouse" && s.kind !== "pointer";
    const hp = this._handPoint(s);
    if (!sel.lastHand) sel.lastHand = hp.clone();
    const dReach = _v2.subVectors(hp, sel.lastHand).dot(s.ray.dir);
    sel.lastHand.copy(hp);
    let target = 1;
    if (useGain && dt > 0) {
      const k = THREE2.MathUtils.smoothstep(Math.abs(dReach) / dt, G.vLow, G.vHigh);
      target = G.speedMin + (G.speedMax - G.speedMin) * k;
    }
    sel.gain += (target - sel.gain) * Math.min(1, dt * G.smoothing);
    if (!useGain) sel.gain = 1;
    sel.peakGain = Math.max(sel.peakGain, sel.gain);
    sel.reach += dReach * sel.gain;
    let d = sel.d0;
    if (useGain) {
      const dz = G.depthDeadzone;
      const r = sel.reach > dz ? sel.reach - dz : sel.reach < -dz ? sel.reach + dz : 0;
      d = sel.d0 * Math.pow(Math.max(0.05, 1 + r / G.reachRef), G.depthExponent);
    }
    sel.farDist = THREE2.MathUtils.clamp(d + sel.stick, G.minDistance, ICFG.maxRayDistance);
  }
  _beginSelection(i, it, now) {
    if (!it.opts.multi) {
      if (it.selections.length >= 1 && !it.opts.twoHand) return null;
      if (it.selections.length >= 2) return null;
    }
    const sel = new Selection(i, it, now);
    sel.farDist = i.type === "far" ? i.hoverDistance : 0;
    sel.d0 = sel.poseDist = sel.farDist;
    if (i.type === "far") {
      sel.lastHand = this._handPoint(i.source).clone();
      sel.hand0 = sel.lastHand.clone();
    }
    i.selecting = sel;
    it.selections.push(sel);
    this._baselineDrag(sel);
    i.source.pulse(0.35, 20);
    it.emit("press", { interactor: i, point: i.attach.clone() });
    if (it.selections.length === 2 && !it.opts.multi) this._beginTwoHand(it);
    return sel;
  }
  _updateSelection(sel, dt, now) {
    const i = sel.interactor, it = sel.target, s = i.source;
    const elapsed = now - sel.t0;
    if (i.type === "far" && sel.dragging && s.kind === "controller" && Math.abs(s.stick.y) > 0.2) {
      sel.stick += -s.stick.y * ICFG.pushPullSpeed * dt;
    }
    if (i.type === "far" && sel.dragging && s.kind === "mouse" && s.wheelStep) {
      sel.stick += s.wheelStep * 0.08 * Math.max(1, sel.d0);
    }
    if (this.twoHand.has(it)) return;
    if (!sel.dragging) {
      let moved;
      const th = it.opts.dragThreshold;
      if (th === 0) moved = sel.p0.distanceToSquared(i.attach) > 1e-10 || sel.dir0.angleTo(s.ray.dir) > 1e-4;
      else if (i.type === "far") moved = sel.dir0.angleTo(s.ray.dir) > ICFG.dragFarAngle || Math.abs(sel.farDist - sel.d0) > Math.max(0.03, sel.d0 * 0.04) || // reaching in / out also starts a drag
      sel.hand0 && sel.hand0.distanceTo(this._handPoint(s)) > 0.035;
      else moved = sel.p0.distanceTo(i.attach) > (th ?? ICFG.dragNear);
      if (moved && !sel.longFired && (it.opts.draggable || it.has("dragstart") || it.has("drag"))) {
        sel.dragging = true;
        it.emit("dragstart", { interactor: i, point: i.attach.clone() });
      } else if (!sel.longFired && it.wantsLongPress && elapsed > ICFG.longPressMs && !moved) {
        sel.longFired = true;
        s.pulse(0.7, 40);
        it.emit("longpress", { interactor: i, point: i.attach.clone() });
      }
    }
    if (sel.dragging) {
      if (it.opts.draggable) this._applyDrag(sel);
      it.emit("drag", { interactor: i, point: i.attach.clone(), delta: i.attach.clone().sub(sel.p0) });
    }
  }
  _baselineDrag(sel) {
    sel.poseDist = sel.farDist;
    const o = sel.target.object;
    o.updateMatrixWorld();
    this._selectorPose(sel.interactor, _m1);
    if (sel.target.opts.translateOnly) {
      // world-space offset from the attach point (pinch point / point on the ray) to the object; rotation is left alone
      sel.offsetPos = (sel.offsetPos || new THREE2.Vector3()).setFromMatrixPosition(o.matrixWorld).sub(sel.interactor.attach);
    } else sel.offset.copy(_m1).invert().multiply(o.matrixWorld);
  }
  _applyDrag(sel) {
    const o = sel.target.object;
    this._selectorPose(sel.interactor, _m1);
    if (sel.target.opts.translateOnly) {
      _v1.copy(sel.interactor.attach).add(sel.offsetPos);
      o.updateMatrixWorld();
      _m1.copy(o.matrixWorld).setPosition(_v1);
    } else _m1.multiply(sel.offset);
    this._constrain(sel.target, _m1);
    setWorldMatrix(o, _m1);
  }
  _endSelection(sel, cancelled) {
    const i = sel.interactor, it = sel.target;
    const wasTwo = this.twoHand.has(it);
    if (wasTwo) this._endTwoHand(it);
    it.selections = it.selections.filter((x) => x !== sel);
    i.selecting = null;
    const elapsed = this.now - sel.t0;
    if (sel.dragging) it.emit("dragend", { interactor: i, point: i.attach.clone(), cancelled, peakGain: sel.peakGain, distance: sel.farDist, startDistance: sel.d0 });
    else if (!cancelled && !sel.longFired && !sel.wasTwo && elapsed < Math.max(ICFG.tapMaxMs, it.wantsLongPress ? ICFG.longPressMs : 0)) {
      it.emit("tap", { interactor: i, point: i.attach.clone() });
    }
    it.emit("release", { interactor: i, cancelled });
    if (wasTwo && it.selections.length === 1) {
      const rest = it.selections[0];
      rest.wasTwo = true;
      rest.dragging = !!(it.opts.draggable || it.has("drag"));
      if (rest.dragging) {
        this._baselineDrag(rest);
        it.emit("dragstart", { interactor: rest.interactor, point: rest.interactor.attach.clone() });
      }
    }
  }
  // - two-hand rotate / scale -
  _beginTwoHand(it) {
    const [a, b] = it.selections;
    for (const s of [a, b]) {
      if (s.dragging) {
        s.dragging = false;
        it.emit("dragend", { interactor: s.interactor, point: s.interactor.attach.clone() });
      }
      s.wasTwo = true;
    }
    const o = it.object;
    o.updateMatrixWorld();
    const st = {
      a,
      b,
      mid0: new THREE2.Vector3().lerpVectors(a.interactor.attach, b.interactor.attach, 0.5),
      dir0: new THREE2.Vector3().subVectors(b.interactor.attach, a.interactor.attach),
      pos0: new THREE2.Vector3(),
      quat0: new THREE2.Quaternion(),
      scale0: new THREE2.Vector3(),
      lastRatio: 1,
      lastQuat: new THREE2.Quaternion()
    };
    st.len0 = Math.max(st.dir0.length(), 1e-3);
    st.dir0.normalize();
    o.matrixWorld.decompose(st.pos0, st.quat0, st.scale0);
    this.twoHand.set(it, st);
    it.emit("transformstart", { interactors: [a.interactor, b.interactor] });
  }
  _updateTwoHand() {
    for (const [it, st] of this.twoHand) {
      const A = st.a.interactor.attach, B = st.b.interactor.attach;
      const mid = _v1.lerpVectors(A, B, 0.5);
      const dir = _v2.subVectors(B, A);
      const len = Math.max(dir.length(), 1e-3);
      dir.normalize();
      let ratio = len / st.len0;
      const s0 = st.scale0.x;
      ratio = THREE2.MathUtils.clamp(s0 * ratio, ICFG.minScale, ICFG.maxScale) / s0;
      const q = _q1.setFromUnitVectors(st.dir0, dir);
      if (!it.has("rotate") && !it.opts.twoHand) q.identity();
      if (it.opts.twoHand) {
        const pos = _v3.copy(st.pos0).sub(st.mid0).multiplyScalar(ratio).applyQuaternion(q).add(mid);
        const quat = q.clone().multiply(st.quat0);
        const scl = st.scale0.clone().multiplyScalar(ratio);
        _m1.compose(pos, quat, scl);
        this._constrain(it, _m1);
        setWorldMatrix(it.object, _m1);
      }
      if (Math.abs(ratio - st.lastRatio) > 1e-4) {
        it.emit("scale", { ratio, delta: ratio / st.lastRatio });
        st.lastRatio = ratio;
      }
      if (st.lastQuat.angleTo(q) > 1e-4) {
        it.emit("rotate", { quaternion: q.clone(), angle: 2 * Math.acos(Math.min(1, Math.abs(q.w))) });
        st.lastQuat.copy(q);
      }
    }
  }
  _endTwoHand(it) {
    if (!this.twoHand.has(it)) return;
    this.twoHand.delete(it);
    it.emit("transformend", {});
  }
  // Long-press progress for visuals: [{point, progress}]
  longPressProgress(out = []) {
    out.length = 0;
    for (const it of this.interactables) {
      if (!it.wantsLongPress) continue;
      for (const s of it.selections) {
        if (s.dragging || s.longFired || this.twoHand.has(it)) continue;
        const e = this.now - s.t0;
        if (e < ICFG.longPressShowMs) continue;
        out.push({ point: s.interactor.attach, progress: Math.min(1, (e - ICFG.longPressShowMs) / (ICFG.longPressMs - ICFG.longPressShowMs)) });
      }
    }
    return out;
  }
};
function setWorldMatrix(o, m) {
  if (o.parent) {
    o.parent.updateMatrixWorld();
    _m2.copy(o.parent.matrixWorld).invert().multiply(m);
  } else _m2.copy(m);
  _m2.decompose(o.position, o.quaternion, o.scale);
  o.updateMatrixWorld(true);
}

// src/visuals.js
import * as THREE3 from "three";
import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
var THEME = {
  left: new THREE3.Color(16777215),
  right: new THREE3.Color(16777215),
  accent: new THREE3.Color(16777215),
  hover: new THREE3.Color(16777215),
  // everything interaction-related is white: ray, cursor, hover glow, poke / long-press rings
  select: new THREE3.Color(16777215),
  ray: new THREE3.Color(16777215)
};
var _v12 = new THREE3.Vector3();
var _v22 = new THREE3.Vector3();
var _v32 = new THREE3.Vector3();
var _q2 = new THREE3.Quaternion();
var _m = new THREE3.Matrix4();
var _s = new THREE3.Vector3();
var UP = new THREE3.Vector3(0, 1, 0);
var handGLB = { left: null, right: null };
// Outline material for the inverted-hull silhouette: back faces, pushed out along the (skinned) normal.
// Paired with a depth-only mask on the real mesh, only the rim survives the depth test.
// Both the mask and the hull are opaque and forced to the very front of the opaque pass (renderOrder -1000 /
// -999). Everything else - opaque meshes and transparent UI alike - is then depth-tested against the hand:
// what is in front of the hand covers it, what is behind is clipped, and in passthrough the real hand shows
// through the clipped region. (Without the forced order, meshes sorted before the mask kept their colour.)
function outlineMaterial(width = 2e-3, color = 16777215) {
  const m = new THREE3.MeshBasicMaterial({ color, side: THREE3.BackSide });
  m.onBeforeCompile = (sh) => {
    sh.uniforms.uOutline = { value: width };
    sh.vertexShader = "uniform float uOutline;\n" + sh.vertexShader.replace(
      "#include <project_vertex>",
      "#ifndef USE_SKINNING\n#ifndef USE_ENVMAP\n vec3 objectNormal = vec3( normal );\n#endif\n#endif\n transformed += normalize( objectNormal ) * uOutline;\n#include <project_vertex>"
    );
  };
  m.customProgramCacheKey = () => "vxr-outline";
  return m;
}
function setHandAssets(left, right) {
  handGLB.left = left;
  handGLB.right = right;
}
function b64ToBuffer(b64) {
  const bin = atob(b64);
  const u = new Uint8Array(bin.length);
  for (let i = 0; i < bin.length; i++) u[i] = bin.charCodeAt(i);
  return u.buffer;
}
function setHandAssetsBase64(l, r) {
  setHandAssets(b64ToBuffer(l), b64ToBuffer(r));
}
async function loadHandAssets(baseUrl) {
  const get = (n) => fetch(`${baseUrl}${n}.glb`).then((r2) => {
    if (!r2.ok) throw new Error(r2.status);
    return r2.arrayBuffer();
  });
  const [l, r] = await Promise.all([get("left"), get("right")]);
  setHandAssets(l, r);
}
var HandVisual = class {
  constructor(source, scene, opts = {}) {
    this.source = source;
    this.root = new THREE3.Group();
    this.root.name = `hand-${source.handedness}`;
    scene.add(this.root);
    const tint = source.handedness === "left" ? THEME.left : THEME.right;
    this.tint = tint.clone();
    this.showMesh = opts.showMesh ?? true;
    this.showJoints = opts.showJoints ?? false;
    const jg = new THREE3.SphereGeometry(1, 12, 8);
    this.jointMat = new THREE3.MeshBasicMaterial({ color: 16777215, transparent: true, opacity: 0.95, depthTest: false });
    this.joints = new THREE3.InstancedMesh(jg, this.jointMat, JOINTS.length);
    this.joints.instanceColor = new THREE3.InstancedBufferAttribute(new Float32Array(JOINTS.length * 3), 3);
    this.joints.frustumCulled = false;
    this.joints.renderOrder = 10;
    this.root.add(this.joints);
    const bg = new THREE3.CylinderGeometry(1, 1, 1, 6, 1, true).translate(0, 0.5, 0);
    this.boneMat = new THREE3.MeshBasicMaterial({ color: tint, transparent: true, opacity: 0.8, depthTest: false });
    this.bones = new THREE3.InstancedMesh(bg, this.boneMat, BONES.length);
    this.bones.frustumCulled = false;
    this.bones.renderOrder = 9;
    this.root.add(this.bones);
    // (no pinch indicator ball: the near cursor is the direct-interaction affordance and the ray the far one,
    //  so only one affordance is visible at a time)
    this.mesh = null;
    this.meshBones = [];
    this._meshTried = false;
    this._tint = tint;
    this._c = new THREE3.Color();
  }
  _loadMesh() {
    const buf = handGLB[this.source.handedness];
    if (!buf || this._meshTried) return;
    this._meshTried = true;
    const tint = this._tint;
    new GLTFLoader().parse(buf.slice(0), "", (gltf) => {
      const obj = gltf.scene.children[0] || gltf.scene;
      const hulls = [];
      obj.traverse((o) => {
        if (o.isSkinnedMesh || o.isMesh) {
          o.frustumCulled = false;
          // depth-only mask: no colour, but occludes what is behind the hand and the inside of the hull
          o.material = new THREE3.MeshBasicMaterial({ colorWrite: false });
          // must be the first thing drawn: a depth-only mask cannot erase colour that is already in the
          // framebuffer, so any opaque mesh sorted before it would stay visible where the hand is in front
          o.renderOrder = -1000;
          o.userData.noHighlight = true;
          o.userData.noCollider = true;
          // inverted hull sharing the same skeleton -> white silhouette line
          const hull = o.clone(false);
          hull.material = outlineMaterial(2e-3);
          hull.frustumCulled = false;
          hull.renderOrder = -999;
          hull.userData.noHighlight = true;
          hull.userData.noCollider = true;
          hulls.push([o, hull]);
        }
      });
      for (const [o, hull] of hulls) o.parent.add(hull);
      this.hulls = hulls.map(([, h]) => h);
      for (const name of JOINTS) {
        const b = obj.getObjectByName(name);
        if (b) this.meshBones.push({ bone: b, j: J[name] });
      }
      this.mesh = obj;
      obj.visible = false;
      this.root.add(obj);
    }, (err) => console.warn("hand mesh failed", err));
  }
  update() {
    const s = this.source;
    if (!this.mesh) this._loadMesh();
    this.root.visible = s.tracked;
    if (!s.tracked) return;
    const pv = s.pinchValue;
    this.joints.visible = this.bones.visible = this.showJoints;
    for (let i = 0; i < JOINTS.length; i++) {
      const j = s.joints[i];
      const r = Math.max(4e-3, j.radius * 0.55);
      _m.compose(j.pos, j.quat, _s.setScalar(r));
      this.joints.setMatrixAt(i, _m);
      const isPinchTip = i === J["thumb-tip"] || i === J["index-finger-tip"];
      this._c.copy(this.tint).lerp(THEME.select, 0.55);
      if (isPinchTip) this._c.lerp(THEME.accent, pv);
      this.joints.setColorAt(i, this._c);
    }
    this.joints.instanceMatrix.needsUpdate = true;
    this.joints.instanceColor.needsUpdate = true;
    for (let b = 0; b < BONES.length; b++) {
      const a = s.joints[BONES[b][0]].pos, c = s.joints[BONES[b][1]].pos;
      _v12.subVectors(c, a);
      const len = _v12.length();
      _q2.setFromUnitVectors(UP, _v12.normalize());
      _m.compose(a, _q2, _s.set(22e-4, len, 22e-4));
      this.bones.setMatrixAt(b, _m);
    }
    this.bones.instanceMatrix.needsUpdate = true;
    if (this.mesh) {
      this.mesh.visible = this.showMesh;
      if (this.showMesh) for (const { bone, j } of this.meshBones) {
        bone.position.copy(s.joints[j].pos);
        bone.quaternion.copy(s.joints[j].quat);
      }
    }
  }
  dispose() {
    this.root.removeFromParent();
  }
};
var ControllerVisual = class {
  constructor(source, scene) {
    this.source = source;
    this.root = new THREE3.Group();
    scene.add(this.root);
    const tint = source.handedness === "left" ? THEME.left : THEME.right;
    this.tint = tint.clone();
    this.bodyMat = new THREE3.MeshStandardMaterial({ color: tint, roughness: 0.35, metalness: 0.1, transparent: true, opacity: 0.9, emissive: 0 });
    this.body = new THREE3.Mesh(new THREE3.SphereGeometry(1, 32, 20), this.bodyMat);
    this.body.userData.noHighlight = true;
    this.root.add(this.body);
    this.nose = new THREE3.Mesh(new THREE3.SphereGeometry(6e-3, 16, 12), new THREE3.MeshBasicMaterial({ color: 16777215 }));
    this.root.add(this.nose);
    const dotG = new THREE3.SphereGeometry(45e-4, 12, 8);
    this.btnA = new THREE3.Mesh(dotG, new THREE3.MeshBasicMaterial({ color: 5592405 }));
    this.btnB = new THREE3.Mesh(dotG, new THREE3.MeshBasicMaterial({ color: 5592405 }));
    this.stick = new THREE3.Mesh(new THREE3.SphereGeometry(5e-3, 12, 8), new THREE3.MeshBasicMaterial({ color: 16777215 }));
    this.root.add(this.btnA, this.btnB, this.stick);
    this._c = new THREE3.Color();
  }
  update() {
    const s = this.source;
    this.root.visible = s.tracked;
    if (!s.tracked) return;
    this.root.position.copy(s.ray.origin);
    this.root.quaternion.copy(s.ray.quat);
    const t = s.selectValue, g = s.squeeze;
    const rx = 0.022 * (1 + 0.18 * g), ry = 0.018 * (1 + 0.18 * g), rz = 0.05 * (1 - 0.18 * t);
    this.body.scale.set(rx, ry, rz);
    this.body.position.set(0, 0, -0.02 + rz);
    this.nose.position.set(0, 0, -0.02);
    this._c.copy(this.tint).lerp(THEME.accent, t);
    this.bodyMat.color.copy(this._c);
    this.bodyMat.emissive.copy(THEME.accent).multiplyScalar(0.35 * t + 0.25 * g);
    this.nose.material.color.copy(s.select ? THEME.accent : THEME.select);
    this.nose.scale.setScalar(s.select ? 1.5 : 1);
    const top = ry * 0.92;
    this.btnA.position.set(-6e-3, top, 0.012 + rz * 0.2);
    this.btnB.position.set(6e-3, top, 0 + rz * 0.2);
    this.btnA.material.color.set(s.buttons.a ? THEME.accent : 5592405);
    this.btnB.material.color.set(s.buttons.b ? THEME.accent : 5592405);
    this.stick.position.set(s.stick.x * 8e-3, top + 2e-3, 0.03 + s.stick.y * 8e-3);
  }
  dispose() {
    this.root.removeFromParent();
  }
};
var RAY_SEG = 24;
var InteractorVisual = class {
  constructor(group, scene) {
    this.group = group;
    this.root = new THREE3.Group();
    scene.add(this.root);
    const pos = new Float32Array((RAY_SEG + 1) * 3);
    const alpha = new Float32Array(RAY_SEG + 1);
    const geo = new THREE3.BufferGeometry();
    geo.setAttribute("position", new THREE3.BufferAttribute(pos, 3));
    geo.setAttribute("alpha", new THREE3.BufferAttribute(alpha, 1));
    this.rayMat = new THREE3.ShaderMaterial({
      transparent: true,
      depthWrite: false,
      uniforms: { uColor: { value: THEME.ray.clone() }, uOpacity: { value: 0.6 } },
      vertexShader: "attribute float alpha; varying float vA; void main(){ vA = alpha; gl_Position = projectionMatrix * modelViewMatrix * vec4(position,1.0); }",
      fragmentShader: "uniform vec3 uColor; uniform float uOpacity; varying float vA; void main(){ gl_FragColor = vec4(uColor, vA * uOpacity); }"
    });
    this.ray = new THREE3.Line(geo, this.rayMat);
    this.ray.frustumCulled = false;
    this.ray.renderOrder = 20;
    this.root.add(this.ray);
    this.reticle = new THREE3.Mesh(
      new THREE3.RingGeometry(0.6, 1, 32),
      new THREE3.MeshBasicMaterial({ color: THEME.accent, transparent: true, opacity: 0.9, depthTest: false, side: THREE3.DoubleSide })
    );
    this.reticle.renderOrder = 30;
    this.root.add(this.reticle);
    // (no near cursor sphere: direct-interaction hover shows on the object itself)
    this.pokeRing = new THREE3.Mesh(
      new THREE3.RingGeometry(0.75, 1, 40),
      new THREE3.MeshBasicMaterial({ color: THEME.accent, transparent: true, opacity: 0.9, depthTest: false, side: THREE3.DoubleSide })
    );
    this.pokeRing.renderOrder = 30;
    this.root.add(this.pokeRing);
    this.showRay = true;
    this.fade = 1;
    this.hk = 0;
    this.sk = 0;
    this._c1 = new THREE3.Color();
    this.cursorDist = ICFG.cursorDefaultDepth;
    this._cursorSnap = true;
  }
  update(head, dt = 1 / 60) {
    const g = this.group, s = g.source, a = g.active;
    const tracked = s.tracked && !g.blocked;
    this.root.visible = tracked;
    if (!tracked) {
      this._cursorSnap = true;
      return;
    }
    const holding = !!(g.far.selecting || g.near.selecting);
    this.fade += ((holding ? 0 : 1) - this.fade) * Math.min(1, dt * (holding ? 12 : 20));
    const F = this.fade;
    const farOn = a === g.far && this.showRay && s.ray.valid && !!(g.far.hover || g.far.selecting);
    const sel = g.far.selecting;
    const hasTarget = !!(g.far.hover || sel);
    // smoothed cursor / ray state (hover and select fade in and out instead of switching)
    const rate = Math.min(1, dt * ICFG.cursorStateSmoothing);
    this.hk += ((hasTarget ? 1 : 0) - this.hk) * rate;
    this.sk += ((sel ? 1 : 0) - this.sk) * rate;
    this.ray.visible = farOn && s.kind !== "mouse" && F > 0.01;
    this.reticle.visible = farOn && F > 0.01;
    if (!farOn) this._cursorSnap = true;
    if (farOn) {
      const o = s.ray.origin, d = s.ray.dir;
      // straight ray along the aim direction. Its length is the spatial cursor depth from the interaction
      // manager, run through a temporal solver (exponential follow + speed cap) so sudden large shifts and
      // rapid flicker between neighbours are damped; it converges to the spatial value once the ray settles.
      // Exact attach depth while holding; snaps when the ray (re)appears. Hover = reticle + ray colour + highlight.
      // null = nothing inside the depth cone -> keep the previous depth
      const target = sel ? Math.max(0.05, _v22.subVectors(g.far.attach, o).dot(d)) : g.cursorDepth ?? null;
      if (target !== null) {
        if (this._cursorSnap || sel) {
          this.cursorDist = target;
          this._cursorSnap = false;
        } else {
          let delta = (target - this.cursorDist) * Math.min(1, dt * ICFG.cursorSmoothing);
          const maxStep = ICFG.cursorMaxSpeed * dt;
          if (Math.abs(delta) > maxStep) delta = Math.sign(delta) * maxStep;
          this.cursorDist += delta;
        }
      }
      const end = _v12.copy(o).addScaledVector(d, this.cursorDist);
      const pos = this.ray.geometry.attributes.position, al = this.ray.geometry.attributes.alpha;
      for (let k = 0; k <= RAY_SEG; k++) {
        const t = k / RAY_SEG;
        _v32.lerpVectors(o, end, t);
        pos.setXYZ(k, _v32.x, _v32.y, _v32.z);
        al.setX(k, THREE3.MathUtils.lerp(Math.max(0, 0.9 - t) * 0.9, 0.25 + 0.75 * t, this.hk));
      }
      pos.needsUpdate = true;
      al.needsUpdate = true;
      this._c1.copy(THEME.ray).lerp(THEME.accent, this.hk).lerp(THEME.select, this.sk);
      this.rayMat.uniforms.uColor.value.copy(this._c1);
      this.rayMat.uniforms.uOpacity.value = THREE3.MathUtils.lerp(THREE3.MathUtils.lerp(0.55, 0.85, this.hk), 1, this.sk) * F;
      if (this.reticle.visible) {
        // always shown while aiming; smaller and dimmer without a target so the hover state stays readable
        this.reticle.position.copy(end);
        this.reticle.lookAt(head);
        // smoothed state blend: hk = hover (0..1), sk = select (0..1); no hard switch between states
        const hk = this.hk, sk = this.sk;
        const sc = Math.max(6e-3, head.distanceTo(end) * 0.012) * THREE3.MathUtils.lerp(0.9, 1, hk) * THREE3.MathUtils.lerp(1, 0.7, sk);
        this.reticle.scale.setScalar(sc);
        this._c1.copy(THEME.ray).lerp(THEME.hover, hk).lerp(THEME.select, sk);
        this.reticle.material.color.copy(this._c1);
        this.reticle.material.opacity = THREE3.MathUtils.lerp(0.85, 0.95, hk) * F;
      }
    }
    const pokeOn = a === g.poke && g.poke.hover;
    this.pokeRing.visible = !!pokeOn;
    if (pokeOn) {
      const ps = g.pokeState;
      const d = Math.max(0, ps.depth);
      const p = g.poke.hoverPoint;
      this.pokeRing.position.copy(p);
      if (ps.q.normal && ps.target?.opts.poke === "surface") {
        this.pokeRing.quaternion.setFromUnitVectors(_v12.set(0, 0, 1), ps.q.normal);
        this.pokeRing.position.addScaledVector(ps.q.normal, 15e-4);
      } else this.pokeRing.lookAt(head);
      this.pokeRing.scale.setScalar(4e-3 + d * 0.35);
      this.pokeRing.material.color.copy(ps.pressed ? THEME.select : THEME.accent);
      this.pokeRing.material.opacity = ps.pressed ? 1 : 0.5 + 0.5 * (1 - d / 0.045);
    }
  }
  dispose() {
    this.root.removeFromParent();
  }
};
var LongPressRings = class {
  constructor(scene) {
    this.pool = [];
    this.scene = scene;
    this.segments = 48;
  }
  _get(i) {
    if (!this.pool[i]) {
      const m = new THREE3.Mesh(
        new THREE3.RingGeometry(0.014, 0.019, this.segments, 1, Math.PI / 2, -Math.PI * 2),
        new THREE3.MeshBasicMaterial({ color: THEME.accent, transparent: true, opacity: 0.95, depthTest: false, side: THREE3.DoubleSide })
      );
      m.renderOrder = 40;
      this.scene.add(m);
      this.pool[i] = m;
    }
    return this.pool[i];
  }
  update(list, head) {
    for (let i = 0; i < Math.max(list.length, this.pool.length); i++) {
      const e = list[i];
      if (!e) {
        if (this.pool[i]) this.pool[i].visible = false;
        continue;
      }
      const m = this._get(i);
      m.visible = true;
      m.position.copy(e.point);
      m.lookAt(head);
      m.geometry.setDrawRange(0, Math.floor(e.progress * this.segments) * 6);
      m.material.color.copy(e.progress >= 1 ? THEME.select : THEME.accent);
    }
  }
};

// src/ui.js
import * as THREE4 from "three";
var FONT = '600 {s}px system-ui, -apple-system, "Segoe UI", Roboto, sans-serif';
function textTexture(text, { w = 256, h = 64, size = 28, color = "#ffffff", bg = null, align = "center" } = {}) {
  const c = document.createElement("canvas");
  c.width = w;
  c.height = h;
  const tex = new THREE4.CanvasTexture(c);
  tex.colorSpace = THREE4.SRGBColorSpace;
  tex.anisotropy = 4;
  tex.userData.draw = (t, col = color, b = bg) => {
    const g = c.getContext("2d");
    g.clearRect(0, 0, w, h);
    if (b && typeof b === "object") {
      // sketch style: optional fill + white outline; radius \u2265 h/2 gives a capsule
      const lw = b.lineWidth || 3;
      roundRect(g, lw, lw, w - 2 * lw, h - 2 * lw, b.radius ?? h * 0.22);
      if (b.fill) {
        g.fillStyle = b.fill;
        g.fill();
      }
      if (b.stroke) {
        g.strokeStyle = b.stroke;
        g.lineWidth = lw;
        g.stroke();
      }
    } else if (b) {
      g.fillStyle = b;
      roundRect(g, 0, 0, w, h, h * 0.22);
      g.fill();
    }
    g.fillStyle = col;
    // shrink to fit: a capsule is much wider than it is tall, so long captions must not overflow
    let fs = size, pad = Math.max(12, h * 0.55);
    g.font = FONT.replace("{s}", fs);
    while (fs > 8 && g.measureText(t).width > w - 2 * pad) {
      fs -= 2;
      g.font = FONT.replace("{s}", fs);
    }
    g.textAlign = align;
    g.textBaseline = "middle";
    g.fillText(t, align === "center" ? w / 2 : 12, h / 2 + 1);
    tex.needsUpdate = true;
  };
  tex.userData.draw(text);
  return tex;
}
function roundRect(g, x, y, w, h, r) {
  g.beginPath();
  g.moveTo(x + r, y);
  g.arcTo(x + w, y, x + w, y + h, r);
  g.arcTo(x + w, y + h, x, y + h, r);
  g.arcTo(x, y + h, x, y, r);
  g.arcTo(x, y, x + w, y, r);
  g.closePath();
}
function roundedPanelTexture(w, h, { fill = "#000000", stroke = "rgba(255,255,255,0.8)" } = {}) {
  const c = document.createElement("canvas");
  c.width = w;
  c.height = h;
  const g = c.getContext("2d");
  g.fillStyle = fill;
  roundRect(g, 2, 2, w - 4, h - 4, Math.min(w, h) * 0.08);
  g.fill();
  g.strokeStyle = stroke;
  g.lineWidth = 3;
  g.stroke();
  const t = new THREE4.CanvasTexture(c);
  t.colorSpace = THREE4.SRGBColorSpace;
  return t;
}
var UIButton = class {
  constructor(im, label, { w = 0.06, h = 0.026, toggle = false, value = false, onClick = null, fontSize = 30, swatch = null, capsule = false } = {}) {
    this.im = im;
    this.swatch = swatch;
    this.capsule = capsule;
    this.label = label;
    this.toggle = toggle;
    this.value = value;
    this.onClick = onClick;
    this.root = new THREE4.Group();
    this.root.name = `button:${label}`;
    const depth = 0.01;
    this.baseMat = new THREE4.MeshStandardMaterial({ color: 0, roughness: 0.6, emissive: 0 });
    this.base = new THREE4.Mesh(new THREE4.BoxGeometry(w, h, depth), this.baseMat);
    // not rendered: a square box behind a rounded pill would either show its corners or (when translucent)
    // leak passthrough. It stays in the tree as the poke collider / travel geometry.
    // NB: hide the MATERIAL, not the object - Interactable.isVisible walks the object tree, so an invisible
    // object drops out of hit-testing entirely.
    this.baseMat.visible = false;
    // no renderOrder on UI pieces: renderOrder is GLOBAL, so a far panel's text would paint over a near
    // panel's background. The layers are physically offset in z, so distance sorting gets it right.
    this.root.add(this.base);
    this.tex = textTexture(label, { w: 256, h: Math.round(256 * h / w), size: fontSize });
    this.faceMat = new THREE4.MeshBasicMaterial({ map: this.tex, alphaTest: 0.5, alphaToCoverage: true });
    this.face = new THREE4.Mesh(new THREE4.PlaneGeometry(w * 0.96, h * 0.9), this.faceMat);
    this.face.userData.noHighlight = true;
    this.face.userData.noCollider = true;
    this.faceZ = depth / 2 + 8e-4;
    this.face.position.z = this.faceZ;
    this.root.add(this.face);
    this.it = im.add(this.root, {
      poke: "surface",
      highlight: false,
      onPokeDepth: (d) => {
        this.face.position.z = this.faceZ - Math.min(d, depth * 0.8);
      }
    });
    this.it.on("release", (e) => {
      if (!e.cancelled) this._click(e);
    });
    this.it.on("statechange", () => this._paint());
    this._paint();
  }
  _click(e) {
    if (this.toggle) this.value = !this.value;
    this._paint();
    this.onClick?.(this.value, e);
  }
  setValue(v) {
    this.value = v;
    this._paint();
  }
  setLabel(l) {
    this.label = l;
    this._paint();
  }
  _paint() {
    const lvl = this.it ? this.it._level : 0;
    const on = this.toggle && this.value;
    const text = this.toggle ? `${this.label}${on ? " \u25cf" : " \u25cb"}` : this.label;
    // white-line sketch style: outline always; hover = heavier line + faint fill; pressed / toggled on = inverted
    const radius = this.capsule ? this.tex.image.height / 2 : void 0;
    if (this.swatch !== null) {
      // colour swatch: the exact colour as the fill, white outline (heavier on hover / press)
      this.tex.userData.draw("", "#ffffff", { fill: "#" + this.swatch.toString(16).padStart(6, "0"), stroke: lvl ? "#ffffff" : "rgba(255,255,255,0.7)", lineWidth: lvl ? 6 : 3, radius });
      return;
    }
    const inverted = lvl === 2 || on;
    // every state has an opaque fill: a hollow pill would show the passthrough feed through the UI
    this.tex.userData.draw(text, inverted ? "#000000" : "#ffffff", {
      stroke: inverted ? "#ffffff" : lvl === 1 ? "rgba(255,255,255,0.95)" : "rgba(255,255,255,0.7)",
      lineWidth: lvl === 1 ? 5 : 3,
      fill: lvl === 2 ? "#ffffff" : on ? "#ffffff" : lvl === 1 ? "#2a2a2a" : "#000000",
      radius
    });
  }
};
var UISlider = class {
  constructor(im, label, { w = 0.13, value = 0.5, onChange = null } = {}) {
    this.value = value;
    this.onChange = onChange;
    this.w = w;
    this.root = new THREE4.Group();
    const track = new THREE4.Mesh(new THREE4.BoxGeometry(w, 3e-3, 3e-3), new THREE4.MeshBasicMaterial({ color: 5592405 }));
    this.fill = new THREE4.Mesh(new THREE4.BoxGeometry(1, 4e-3, 4e-3), new THREE4.MeshBasicMaterial({ color: 16777215 }));
    this.root.add(track, this.fill);
    this.knob = new THREE4.Mesh(
      new THREE4.CylinderGeometry(9e-3, 9e-3, 8e-3, 24).rotateX(Math.PI / 2),
      new THREE4.MeshBasicMaterial({ color: 16777215 })
    );
    this.root.add(this.knob);
    this.labelTex = textTexture(label, { w: 256, h: 40, size: 24, align: "left", color: "#ffffff" });
    const lab = new THREE4.Mesh(new THREE4.PlaneGeometry(w, w * 40 / 256), new THREE4.MeshBasicMaterial({ map: this.labelTex, transparent: true, depthWrite: false }));
    lab.position.set(0, 0.016, 0);
    this.root.add(lab);
    this.label = label;
    this.knob.name = `slider:${label}`;
    this.it = im.add(this.knob, { poke: "surface", dragThreshold: 0 });
    const toLocal = (p) => this.root.worldToLocal(p.clone());
    const drag = (e) => this.set((toLocal(e.point).x + w / 2) / w);
    this.it.on("press", drag).on("drag", drag).on("dragstart", drag);
    this.set(value, true);
  }
  set(v, silent) {
    this.value = THREE4.MathUtils.clamp(v, 0, 1);
    const x = -this.w / 2 + this.value * this.w;
    this.knob.position.x = x;
    this.fill.scale.x = Math.max(1e-4, this.value * this.w);
    this.fill.position.x = -this.w / 2 + this.value * this.w / 2;
    this.labelTex.userData.draw(`${this.label}  ${Math.round(this.value * 100)}%`);
    if (!silent) this.onChange?.(this.value);
  }
};
var UIPanel = class {
  constructor(title, { w = 0.16, h = 0.12 } = {}) {
    this.w = w;
    this.h = h;
    this.root = new THREE4.Group();
    const bg = new THREE4.Mesh(
      new THREE4.PlaneGeometry(w, h),
      new THREE4.MeshBasicMaterial({ map: roundedPanelTexture(512, Math.round(512 * h / w)), alphaTest: 0.5, alphaToCoverage: true })
    );
    bg.position.z = -6e-3;
    this.root.add(bg);
    if (title) {
      const tt = textTexture(title, { w: 512, h: 64, size: 30, color: "#ffffff", align: "left" });
      // text quads must not write depth: their transparent pixels would otherwise punch a see-through
      // hole in the panel background whenever the sorter draws the background after them
      const t = new THREE4.Mesh(new THREE4.PlaneGeometry(w * 0.92, w * 0.92 * 64 / 512), new THREE4.MeshBasicMaterial({ map: tt, transparent: true, depthWrite: false }));
      t.position.z = 2e-3;
      t.position.set(0, h / 2 - 0.013, 0);
      this.root.add(t);
    }
  }
  // place children in a grid below the title
  layout(items, { cols = 2, top = 0.03, gapX = 6e-3, gapY = 6e-3, cellH = 0.026 } = {}) {
    const cellW = (this.w - 0.016 - gapX * (cols - 1)) / cols;
    items.forEach((it, i) => {
      const r = Math.floor(i / cols), c = i % cols;
      const span = it.span || 1;
      it.root.position.set(
        -this.w / 2 + 8e-3 + cellW / 2 + c * (cellW + gapX) + (span - 1) * (cellW + gapX) / 2,
        this.h / 2 - top - cellH / 2 - r * (cellH + gapY),
        0
      );
      this.root.add(it.root);
    });
  }
};
var HandMenu = class {
  constructor(app2) {
    this.app = app2;
    this.panel = new UIPanel("VibeXR \u00b7 Menu", { w: 0.17, h: 0.204 });
    this.root = this.panel.root;
    this.root.visible = false;
    this.root.scale.setScalar(1e-3);
    app2.scene.add(this.root);
    this.owner = null;
    this.facingSince = /* @__PURE__ */ new Map();
    this.awaySince = 0;
    this.items = [];
    this.worldItems = [];
    this._target = new THREE4.Vector3();
    this.openAmount = 0;
  }
  // buttons in a 2-column grid; optional full-width slider underneath
  setItems(items, slider = null) {
    for (const i of this.items) i.root.removeFromParent();
    this.items = items;
    this.panel.layout(items, { cols: 2, top: 0.028 });
    if (slider) {
      const rows = Math.ceil(items.length / 2);
      slider.root.position.set(0, this.panel.h / 2 - 0.028 - rows * 0.032 - 0.018, 4e-3);
      this.panel.root.add(slider.root);
      this.items.push(slider);
    }
  }
  _hands() {
    return this.app.input.list().filter((s) => s.kind === "hand" && s.tracked);
  }
  update(dt, now) {
    const head = this.app.input.head;
    if (this.owner && this.owner.kind === "hand") {
      const o = this.owner;
      if (!o.tracked || !o.palmFacingHead) {
        if (!this.awaySince) this.awaySince = now;
        if (now - this.awaySince > 300) this._close();
      } else this.awaySince = 0;
    }
    if (!this.owner || this.owner.kind !== "hand") {
      for (const h of this._hands()) {
        const hg = this.app.im.group(h);
        const busy = h.select || hg && (hg.near.hover || hg.poke.hover || hg.selecting);
        if (h.palmFacingHead && !busy) {
          if (!this.facingSince.has(h)) this.facingSince.set(h, now);
          if (now - this.facingSince.get(h) > 350 && !this.owner) {
            const other = this._hands().find((x) => x !== h && x.handedness === "left" && this.facingSince.has(x) && now - this.facingSince.get(x) > 350);
            this._open(other || h);
          }
        } else this.facingSince.delete(h);
      }
    }
    for (const s of this.app.input.list()) {
      if (s.kind === "controller" && s.buttonDown.b) {
        if (this.owner === s) this._close();
        else this._open(s);
      }
    }
    if (this.owner && !this.owner.tracked && this.owner.kind === "controller") this._close();
    const target = this.owner ? 1 : 0;
    this.openAmount += (target - this.openAmount) * Math.min(1, dt * 14);
    this.root.visible = this.openAmount > 0.02;
    this.root.scale.setScalar(Math.max(1e-3, this.openAmount));
    if (this.owner) {
      const o = this.owner;
      if (o.kind === "hand") {
        this._target.copy(o.palmCenter).addScaledVector(o.palmNormal, 0.03);
        this._target.y += 0.095;
      } else {
        this._target.copy(o.ray.origin);
        this._target.y += 0.1;
      }
      if (this.openAmount < 0.3) this.root.position.copy(this._target);
      else this.root.position.lerp(this._target, Math.min(1, dt * 18));
      this.root.lookAt(head.x, head.y, head.z);
    }
  }
  _open(src) {
    if (this.owner === src) return;
    if (this.owner) this._setBlocked(this.owner, false);
    this.owner = src;
    this.awaySince = 0;
    this._setBlocked(src, true);
    this.app.log(`menu open (${src.kind}-${src.handedness})`);
  }
  _close() {
    if (!this.owner) return;
    this._setBlocked(this.owner, false);
    this.app.log("menu close");
    this.owner = null;
    this.facingSince.clear();
  }
  _setBlocked(src, v) {
    const g = this.app.im.group(src);
    if (g) g.blocked = v;
  }
};
// 2D drawing surface on a thin board. Any interactor can draw: fingertip poke (width follows depth),
// near pinch, far ray (pinch / trigger) and the desktop mouse. Strokes are colour-coded by method
// unless a swatch is chosen. opts.multi lets both hands draw at once.
var _sp = new THREE4.Vector3();
var _spn = new THREE4.Vector3();
var _spp = new THREE4.Vector3();
var _spl = new THREE4.Plane();
var _spr = new THREE4.Ray();
var SketchBoard = class {
  constructor(ctx, { w = 0.48, h = 0.36, px = 1024 } = {}) {
    this.app = ctx.app;
    this.w = w;
    this.h = h;
    this.root = new THREE4.Group();
    this.root.name = "sketchboard";
    // the root (pivot for dragging, facing and distance scaling) sits at the handle bar on the lower edge,
    // so the bar stays under the pinch while the board scales or turns
    this.board = new THREE4.Group();
    this.board.position.y = h / 2 + 0.024;
    this.root.add(this.board);
    this.c = document.createElement("canvas");
    this.c.width = px;
    this.c.height = Math.round(px * h / w);
    this.g = this.c.getContext("2d");
    this.tex = new THREE4.CanvasTexture(this.c);
    this.tex.colorSpace = THREE4.SRGBColorSpace;
    this.tex.anisotropy = 4;
    const depth = 0.01;
    // one black panel behind the drawing surface AND the header row, so nothing floats outside the board
    const headY = h / 2 + 0.028, panelH = h + 0.086;
    this.panel = new THREE4.Mesh(
      new THREE4.PlaneGeometry(w + 0.028, panelH),
      new THREE4.MeshBasicMaterial({ map: roundedPanelTexture(512, Math.round(512 * panelH / (w + 0.028))), alphaTest: 0.5, alphaToCoverage: true })
    );
    this.panel.position.set(0, (panelH - h) / 2 - 0.014, -depth / 2 - 1e-3);
    this.panel.userData.noCollider = this.panel.userData.noHighlight = true;
    this.body = new THREE4.Mesh(new THREE4.BoxGeometry(w, h, depth), new THREE4.MeshStandardMaterial({ color: 0, roughness: 0.7 }));
    this.body.name = "sketch";
    this.body.material.visible = false;
    this.board.add(this.panel, this.body);
    this.face = new THREE4.Mesh(new THREE4.PlaneGeometry(w, h), new THREE4.MeshBasicMaterial({ map: this.tex, alphaTest: 0.5, alphaToCoverage: true }));
    this.face.position.z = depth / 2 + 8e-4;
    this.face.userData.noCollider = true;
    this.face.userData.noHighlight = true;
    this.board.add(this.face);
    this.color = null;
    this.strokes = /* @__PURE__ */ new Map();
    this.strokeCount = 0;
    this.it = ctx.add(this.body, { poke: "surface", dragThreshold: 0, multi: true, highlight: false });
    this.it.on("press", (e) => this._begin(e)).on("drag", (e) => this._move(e)).on("release", (e) => this._end(e));
    // header row, all one family: capsule caption, capsule swatches, capsule Clear - on the panel, not outside it
    const y = headY, bh = 0.026;
    const capW = 0.2, capTex = textTexture("Sketch \u00b7 poke \u00b7 pinch \u00b7 ray \u00b7 mouse", { w: 512, h: Math.round(512 * bh / capW), size: 44, color: "#ffffff" });
    capTex.userData.draw("Sketch \u00b7 poke \u00b7 pinch \u00b7 ray \u00b7 mouse", "#ffffff", { fill: "#000000", stroke: "rgba(255,255,255,0.7)", lineWidth: 3, radius: Math.round(512 * bh / capW) / 2 });
    this.caption = new THREE4.Mesh(new THREE4.PlaneGeometry(capW, bh), new THREE4.MeshBasicMaterial({ map: capTex, alphaTest: 0.5, alphaToCoverage: true }));
    this.caption.position.set(-w / 2 + capW / 2, y, 2e-3);
    this.caption.userData.noCollider = this.caption.userData.noHighlight = true;
    this.board.add(this.caption);
    const gap = 6e-3, autoW = 0.05, sw = 0.03;
    let x = -w / 2 + capW + 0.012 + autoW / 2;
    this.swatches = [];
    const addSwatch = (col, label, bw) => {
      const b = ctx.button(label, { w: bw, h: bh, fontSize: 26, swatch: col, capsule: true, onClick: () => this.setColor(col) });
      b.col = col;
      b.root.position.set(x, y, 0);
      this.board.add(b.root);
      this.swatches.push(b);
      x += bw / 2 + gap;
    };
    addSwatch(null, "Auto", autoW);
    x += sw / 2;
    for (const col of [6091519, 16748488, 16114298, 16777215]) {
      addSwatch(col, "", sw);
      x += sw / 2;
    }
    const clr = ctx.button("Clear", { w: 0.062, h: bh, fontSize: 24, capsule: true, onClick: () => this.clear() });
    clr.root.position.set(w / 2 - 0.031, y, 0);
    this.board.add(clr.root);
    // drag handle on the lower edge: pinch / trigger / mouse-drag it to move the whole board (translation only;
    // the board re-faces the viewer (from its centre) while held and scales with distance), two hands
    // change the user scale factor.
    // The collider box is limited to the bar so the drawing surface stays a separate interactable.
    const by = 0;
    // a capsule, like the header pills
    this.bar = new THREE4.Mesh(
      new THREE4.CapsuleGeometry(9e-3, 0.182, 6, 20).rotateZ(Math.PI / 2),
      new THREE4.MeshStandardMaterial({ color: 0, roughness: 0.5, emissive: 0 })
    );
    this.bar.position.set(0, by, 0);
    this.bar.name = "sketch-handle";
    this.root.add(this.bar);
    this.barOutline = outlineHull(this.bar, hoverOutlineMaterial());
    this.barOutline.visible = true;
    this.barOutline.material.userData.px.value = 2;
    this.barOutline.material.opacity = 0.75;
    this.bar.add(this.barOutline);
    this.handle = ctx.add(this.root, {
      draggable: true,
      translateOnly: true,
      twoHand: true,
      highlight: false,
      box: new THREE4.Box3(new THREE4.Vector3(-0.1, by - 0.012, -0.012), new THREE4.Vector3(0.1, by + 0.012, 0.012))
      // (collider stays a box around the capsule so the grab target is forgiving)
    });
    this.handle.on("statechange", (e) => {
      this.barOutline.material.userData.px.value = e.level === 2 ? ICFG.outlinePxSelect : e.level === 1 ? ICFG.outlinePx : 2;
      this.barOutline.material.opacity = e.level ? 1 : 0.75;
    });
    this.clear();
    this.setColor(null);
  }
  setColor(col) {
    this.color = col;
    for (const b of this.swatches) b.root.scale.setScalar(b.col === col ? 1.18 : 1);
  }
  clear() {
    const g = this.g, W = this.c.width, H = this.c.height;
    g.clearRect(0, 0, W, H);
    g.fillStyle = "#000000";
    roundRect(g, 2, 2, W - 4, H - 4, 22);
    g.fill();
    g.strokeStyle = "rgba(255,255,255,0.10)";
    g.lineWidth = 1;
    for (let x = 64; x < W; x += 64) {
      g.beginPath();
      g.moveTo(x, 8);
      g.lineTo(x, H - 8);
      g.stroke();
    }
    for (let y = 64; y < H; y += 64) {
      g.beginPath();
      g.moveTo(8, y);
      g.lineTo(W - 8, y);
      g.stroke();
    }
    g.strokeStyle = "rgba(255,255,255,0.35)";
    g.lineWidth = 2;
    roundRect(g, 2, 2, W - 4, H - 4, 22);
    g.stroke();
    this.tex.needsUpdate = true;
  }
  // canvas pixel under an interactor: far rays are re-intersected with the face plane so the pen
  // follows the ray across the board; everything else is the attach point projected onto the face
  _point(e) {
    const i = e.interactor, s = i.source;
    this.face.updateMatrixWorld();
    if (i.type === "far" && s.ray?.valid) {
      _spn.set(0, 0, 1).transformDirection(this.face.matrixWorld);
      _spl.setFromNormalAndCoplanarPoint(_spn, this.face.getWorldPosition(_spp));
      _spr.set(s.ray.origin, s.ray.dir);
      if (!_spr.intersectPlane(_spl, _sp)) return null;
    } else _sp.copy(e.point);
    this.face.worldToLocal(_sp);
    const W = this.c.width, H = this.c.height;
    const u = (_sp.x / this.w + 0.5) * W, v = (0.5 - _sp.y / this.h) * H;
    if (u < -24 || v < -24 || u > W + 24 || v > H + 24) return null;
    return [THREE4.MathUtils.clamp(u, 0, W), THREE4.MathUtils.clamp(v, 0, H)];
  }
  _style(e) {
    const i = e.interactor, s = i.source;
    let color = this.color;
    if (color === null) color = i.type === "poke" ? 6091519 : i.type === "near" ? s.handedness === "left" ? 8368895 : 16757375 : s.kind === "mouse" ? 16114298 : 16777215;
    let width = i.type === "near" ? 7 : i.type === "far" ? 4 : s.kind === "mouse" ? 4 : 6;
    if (i.type === "poke") {
      const depth = -(this.app.im.group(s)?.pokeState.depth ?? 0);
      width = 5 + THREE4.MathUtils.clamp(depth / 0.012, 0, 1) * 8;
    }
    return { color: "#" + color.toString(16).padStart(6, "0"), width };
  }
  _dot(p, sty) {
    const g = this.g;
    g.fillStyle = sty.color;
    g.beginPath();
    g.arc(p[0], p[1], sty.width / 2, 0, Math.PI * 2);
    g.fill();
    this.tex.needsUpdate = true;
  }
  _begin(e) {
    const p = this._point(e);
    this.strokes.set(e.interactor, { last: p });
    if (p) this._dot(p, this._style(e));
  }
  _move(e) {
    const st = this.strokes.get(e.interactor);
    if (!st) return;
    const p = this._point(e);
    if (!p) {
      st.last = null;
      return;
    }
    const sty = this._style(e), g = this.g;
    if (st.last) {
      g.strokeStyle = sty.color;
      g.lineWidth = sty.width;
      g.lineCap = "round";
      g.lineJoin = "round";
      g.beginPath();
      g.moveTo(st.last[0], st.last[1]);
      g.lineTo(p[0], p[1]);
      g.stroke();
      this.tex.needsUpdate = true;
    } else this._dot(p, sty);
    st.last = p;
  }
  _end(e) {
    if (this.strokes.delete(e.interactor)) this.strokeCount++;
  }
};
var LogPanel = class {
  constructor({ w = 0.42, h = 0.3, lines = 12 } = {}) {
    this.lines = [];
    this.max = lines;
    this.dirty = true;
    this.last = 0;
    this.c = document.createElement("canvas");
    this.c.width = 768;
    this.c.height = Math.round(768 * h / w);
    this.tex = new THREE4.CanvasTexture(this.c);
    this.tex.colorSpace = THREE4.SRGBColorSpace;
    this.root = new THREE4.Mesh(new THREE4.PlaneGeometry(w, h), new THREE4.MeshBasicMaterial({ map: this.tex, alphaTest: 0.5, alphaToCoverage: true }));
  }
  push(text) {
    const t = (performance.now() / 1e3).toFixed(1).padStart(6);
    this.lines.unshift(`${t}  ${text}`);
    if (this.lines.length > this.max) this.lines.length = this.max;
    this.dirty = true;
  }
  clear() {
    this.lines = [];
    this.dirty = true;
  }
  update(now) {
    if (!this.dirty || now - this.last < 80) return;
    this.dirty = false;
    this.last = now;
    const g = this.c.getContext("2d"), W = this.c.width, H = this.c.height;
    g.clearRect(0, 0, W, H);
    g.fillStyle = "#000000";
    roundRect(g, 2, 2, W - 4, H - 4, 24);
    g.fill();
    g.strokeStyle = "rgba(255,255,255,0.8)";
    g.lineWidth = 3;
    g.stroke();
    g.fillStyle = "#ffffff";
    g.font = FONT.replace("{s}", 30);
    g.textBaseline = "top";
    g.fillText("Interaction events", 28, 22);
    g.font = "500 24px ui-monospace, Menlo, Consolas, monospace";
    const lh = (H - 90) / this.max;
    this.lines.forEach((l, i) => {
      g.fillStyle = i === 0 ? "#ffffff" : `rgba(255,255,255,${1 - i / (this.max + 2)})`;
      g.fillText(l, 28, 72 + i * lh);
    });
    this.tex.needsUpdate = true;
  }
};

// src/world.js
import * as THREE5 from "three";
var WorldManager = class {
  constructor(app2) {
    this.app = app2;
    this.worlds = /* @__PURE__ */ new Map();
    this.current = null;
    this.ctx = null;
  }
  register(world) {
    this.worlds.set(world.id, world);
    return this;
  }
  _makeCtx(world) {
    const app2 = this.app;
    const root = new THREE5.Group();
    root.name = `world:${world.id}`;
    app2.scene.add(root);
    const owned = [];
    const ctx = {
      app: app2,
      THREE: THREE5,
      root,
      world,
      // register an interactable owned by this world
      add: (obj, opts) => {
        const it = app2.im.add(obj, opts);
        owned.push(it);
        return it;
      },
      button: (label, opts) => {
        const b = new UIButton(app2.im, label, opts);
        owned.push(b.it);
        return b;
      },
      slider: (label, opts) => {
        const s = new UISlider(app2.im, label, opts);
        owned.push(s.it);
        return s;
      },
      panel: (title, opts) => new UIPanel(title, opts),
      // auto-sized text label; `height` is the world-space line height in metres
      label: (text, { height = 0.02, color = "#ffffff" } = {}) => {
        const g = document.createElement("canvas").getContext("2d");
        g.font = "600 44px system-ui, sans-serif";
        const cw = Math.ceil(g.measureText(text).width) + 40;
        const tex = textTexture(text, { w: cw, h: 64, size: 44, color });
        return new THREE5.Mesh(new THREE5.PlaneGeometry(height * cw / 64, height), new THREE5.MeshBasicMaterial({ map: tex, transparent: true, depthWrite: false }));
      },
      log: (...a) => app2.log(a.join(" ")),
      get session() {
        return app2.sessionMode;
      },
      _owned: owned
    };
    return ctx;
  }
  async load(id) {
    if(this._loading){this._queued=id;return;}
    this._loading=true;
    const transition=this.current && this.app.transition;
    try {
      const w=this.worlds.get(id);if(!w)throw new Error(`unknown world ${id}`);
      if(transition)await transition.fade(1,320);
      this.unload();const ctx=this._makeCtx(w);this.ctx=ctx;this.current=w;this._failed=false;
      try {await w.init?.(ctx);w.enter?.(ctx);this.app.onWorldChanged?.(w,ctx);this.app.log(`world → ${w.title||id}`);}
      catch(e){console.error(e);this.unload();this.app.error(`Could not open ${w.title||id}. Returning to the gallery.`);if(id!=="gallery")this._queued="gallery";}
    } finally {if(transition)await transition.fade(0,650);this._loading=false;const next=this._queued;this._queued=null;if(next)await this.load(next);}
  }
  unload() {
    if (!this.current) return;
    const w = this.current, ctx = this.ctx;
    try {
      w.exit?.(ctx);
    } catch (e) {
      console.error(e);
    }
    for (const it of ctx._owned) this.app.im.remove(it);
    // Menu buttons are reparented outside the world root; reclaim them as well.
    for(const it of ctx._owned) if(!ctx.root.getObjectById(it.object.id)) {it.object.removeFromParent();ctx.root.add(it.object);}
    ctx.root.removeFromParent();
    const disposed=new Set();
    ctx.root.traverse((o) => {
      if(o.geometry && !disposed.has(o.geometry)){disposed.add(o.geometry);o.geometry.dispose();}
      const mats = Array.isArray(o.material) ? o.material : o.material ? [o.material] : [];
      for (const m of mats) {
        if(disposed.has(m))continue;disposed.add(m);
        for(const k in m) if(m[k]?.isTexture && !m[k].userData.sharedPreview && !disposed.has(m[k])){disposed.add(m[k]);m[k].dispose();}
        m.dispose();
      }
    });
    this.current = null;
    this.ctx = null;
  }
  reload() {
    if (this.current) return this.load(this.current.id);
  }
  update(dt, t) {
    if (this._loading || this._failed || !this.current?.update) return;
    try {
      this.current.update(dt, t, this.ctx);
    } catch (e) {
      console.error(e);
      this.app.error(`world update error: ${e.message}`);
      this._failed = true;
    }
  }
};

// src/worlds/playground.js
import * as THREE6 from "three";
var COLORS = [8368895, 16757375, 10354608, 16748488, 16114298];
var TABLE_TOP = 1.44;
// table surface height (m); everything on the table is placed relative to it. Recalibrated on every
// session start and every reset: TABLE_BELOW_HEAD under the headset (desktop preview keeps 1.44).
var TABLE_BELOW_HEAD = 0.5;
function calibratedTableTop(app2) {
  if (!app2.sessionMode) return 1.44;
  return THREE6.MathUtils.clamp(app2.input.head.y - TABLE_BELOW_HEAD, 0.55, 1.6);
}
var BOARD_SCALE_NEAR = 0.5;
// m: inside this distance the sketch board keeps a fixed scale
var BOARD_SCALE_K = 0.8;
// linear slope of the distance scaling beyond that: scale ~ 1 + K * (d - near) / near, no upper clamp
// (K = 1 is the constant-angular-size line; K = 0.8 lets the board read slightly smaller with distance - an
//  intuitive depth cue - while staying legible, and the slope stays the same however far it goes)
var Playground = {
  id: "playground",
  title: "Interaction Playground",
  init(ctx) {
    TABLE_TOP = calibratedTableTop(ctx.app);
    ctx.app.log(`table at ${TABLE_TOP.toFixed(2)} m (head ${ctx.app.input.head.y.toFixed(2)} m)`);
    const { root, THREE: T } = ctx;
    const inAR = ctx.session === "ar";
    root.add(new T.HemisphereLight(13623551, 2105392, 1.6));
    const sun = new T.DirectionalLight(16777215, 1.4);
    sun.position.set(1, 3, 2);
    root.add(sun);
    const grid = new T.GridHelper(8, 32, 2898520, 1712950);
    grid.material.transparent = true;
    grid.material.opacity = 0.6;
    root.add(grid);
    this.grid = grid;
    this.app = ctx.app;
    const ring = new T.Mesh(new T.RingGeometry(0.28, 0.3, 64).rotateX(-Math.PI / 2), new T.MeshBasicMaterial({ color: 6091519, transparent: true, opacity: 0.35 }));
    ring.position.y = 2e-3;
    root.add(ring);
    const table = new T.Mesh(new T.CylinderGeometry(0.34, 0.3, 0.04, 48), new T.MeshStandardMaterial({ color: 2239552, roughness: 0.8 }));
    table.position.set(0, TABLE_TOP - 0.02, -0.5);
    root.add(table);
    const legH = TABLE_TOP - 0.04;
    const leg = new T.Mesh(new T.CylinderGeometry(0.04, 0.06, legH, 16), new T.MeshStandardMaterial({ color: 1712432 }));
    leg.position.set(0, legH / 2, -0.5);
    root.add(leg);
    const tl = ctx.label("Pinch / ray-grab \u00b7 two hands: rotate + scale \u00b7 tap: color \u00b7 hold: spin \u00b7 stays on the table", { height: 0.018 });
    tl.position.set(0, TABLE_TOP + 0.02, -0.19);
    tl.rotation.x = -Math.PI / 2.6;
    root.add(tl);
    this.spinners = [];
    [-0.14, 0, 0.14].forEach((x, i) => {
      const m = new T.Mesh(new T.BoxGeometry(0.07, 0.07, 0.07), new T.MeshStandardMaterial({ color: COLORS[i], roughness: 0.4, emissive: 0 }));
      m.position.set(x, TABLE_TOP + 0.04, -0.5);
      m.name = `cube-${i + 1}`;
      root.add(m);
      let ci = i;
      const it = ctx.add(m, {
        draggable: true,
        twoHand: true,
        // never below the table top - applies to drags and two-hand transforms
        constrain: ({ position, scale }) => {
          position.y = Math.max(position.y, TABLE_TOP + 0.035 * scale.y);
        }
      });
      it.on("tap", () => {
        ci = (ci + 1) % COLORS.length;
        m.material.color.setHex(COLORS[ci]);
      });
      it.on("longpress", () => {
        m.userData.spin = !m.userData.spin;
      });
      this.spinners.push(m);
    });
    const orb = new T.Mesh(new T.IcosahedronGeometry(0.045, 2), new T.MeshStandardMaterial({ color: 13215999, roughness: 0.3, emissive: 0, flatShading: true }));
    orb.position.set(0.36, TABLE_TOP + 0.24, -0.42);
    orb.name = "orb";
    root.add(orb);
    const oit = ctx.add(orb, { precise: true });
    oit.on("tap", () => {
      orb.userData.bounce = 1;
    });
    oit.on("longpress", () => {
      orb.userData.burst = 1;
      orb.material.color.setHSL(Math.random(), 0.7, 0.7);
    });
    const ol = ctx.label("tap: bounce \u00b7 hold: burst", { height: 0.016 });
    ol.position.set(0.36, TABLE_TOP + 0.32, -0.42);
    root.add(ol);
    this.orb = orb;
    const bell = new T.Mesh(new T.SphereGeometry(0.028, 24, 16), new T.MeshStandardMaterial({ color: 16114298, roughness: 0.3, emissive: 0 }));
    bell.position.set(0.36, TABLE_TOP + 0.12, -0.36);
    bell.name = "bell";
    root.add(bell);
    const bit = ctx.add(bell, { poke: "volume", near: false });
    bit.on("press", () => {
      bell.userData.ring = 1;
    });
    const bl = ctx.label("poke me (fingertip / controller nose)", { height: 0.013 });
    bl.position.set(0.36, TABLE_TOP + 0.07, -0.33);
    bl.rotation.x = -0.5;
    root.add(bl);
    this.bell = bell;
    this.far = [];
    [[-1.2, 1.5, -3], [0, 1.9, -3.4], [1.2, 1.4, -3]].forEach((p, i) => {
      const m = new T.Mesh(new T.SphereGeometry(0.16, 32, 20), new T.MeshStandardMaterial({ color: COLORS[(i + 2) % 5], roughness: 0.35, emissive: 0 }));
      m.position.set(...p);
      m.name = `far-${i + 1}`;
      const halo = new T.Mesh(new T.SphereGeometry(0.17, 24, 16), new T.MeshBasicMaterial({ color: 6091519, wireframe: true, transparent: true, opacity: 0 }));
      halo.userData.noCollider = true;
      halo.userData.noHighlight = true;
      halo.visible = false;
      m.add(halo);
      m.userData.halo = halo;
      root.add(m);
      const it = ctx.add(m, { draggable: true, twoHand: true, precise: true });
      it.on("tap", () => {
        m.userData.pulse = 1;
      });
      this.far.push(m);
    });
    const fl = ctx.label("far: ray-pinch / trigger \u00b7 drag to move \u00b7 thumbstick / wheel: push \u00b7 pull", { height: 0.07 });
    fl.position.set(0, 2.35, -3.4);
    root.add(fl);
    const panel = ctx.panel("UI \u00b7 poke, pinch or ray", { w: 0.22, h: 0.15 });
    panel.root.position.set(-0.5, TABLE_TOP + 0.06, -0.36);
    panel.root.lookAt(0, TABLE_TOP + 0.3, 0.3);
    root.add(panel.root);
    let count = 0;
    const counter = ctx.button("Count: 0", { onClick: () => counter.setLabel(`Count: ${++count}`) });
    const toggle = ctx.button("Toggle", { toggle: true, onClick: (v) => {
      this.spinners.forEach((s) => s.userData.spin = v);
    } });
    const reset = ctx.button("Reset scene", { onClick: () => ctx.app.worlds.reload() });
    const clear = ctx.button("Clear log", { onClick: () => ctx.app.logPanel.clear() });
    const slider = ctx.slider("Cube size", { w: 0.19, value: 0.5, onChange: (v) => this.spinners.forEach((s) => s.scale.setScalar(0.5 + v)) });
    slider.span = 2;
    panel.layout([counter, toggle, reset, clear], { cols: 2, top: 0.03 });
    slider.root.position.set(0, -0.05, 4e-3);
    panel.root.add(slider.root);
    const board = new SketchBoard(ctx, { w: 0.48, h: 0.36 });
    board.root.position.set(-0.78, TABLE_TOP + 0.196, -0.5);
    board.root.lookAt(0, TABLE_TOP + 0.3, 0.3);
    root.add(board.root);
    this.board = board;
    const log = ctx.app.logPanel.root;
    log.position.set(0.72, TABLE_TOP + 0.38, -0.78);
    log.lookAt(0, TABLE_TOP + 0.46, 0.1);
    root.add(log);
  },
  update(dt, t) {
    const a = this.app.sessionMode === "ar" ? this.app.vst.opacity : 1;
    this.grid.material.opacity = 0.15 + 0.45 * a;
    // The sketch board only adapts while its handle is held (drag or two-hand scale); released, it keeps both
    // its orientation and its scale. While held:
    //  - it re-faces the viewer, the direction computed from the PANEL CENTRE to the head (not from the handle
    //    pivot below it), applied about the pivot so the grab point stays under the pinch;
    //  - distance scaling: fixed inside BOARD_SCALE_NEAR, beyond it linear in distance with slope BOARD_SCALE_K
    //    (K = 0.8: slightly smaller with distance as a depth cue, still legible; no upper clamp), relative to
    //    the designed size at the initial placement distance. A two-hand scale edits the user factor instead.
    const head = this.app.input.head, bd = this.board;
    const dist = Math.max(BOARD_SCALE_NEAR, bd.root.position.distanceTo(head));
    if (!bd.refDist) bd.refDist = dist;
    if (bd.handle.selections.length) {
      const c = bd.it.worldCenter(new THREE6.Vector3());
      bd.root.lookAt(bd.root.position.clone().add(head.clone().sub(c)));
      const lin = (d) => 1 + BOARD_SCALE_K * (d - BOARD_SCALE_NEAR) / BOARD_SCALE_NEAR;
      const comp = lin(dist) / lin(bd.refDist);
      if (this.app.im.twoHand.has(bd.handle)) bd.userScale = THREE6.MathUtils.clamp(bd.root.scale.x / comp, 0.3, 3);
      else bd.root.scale.setScalar(THREE6.MathUtils.clamp(bd.userScale ?? 1, 0.3, 3) * comp);
    }
    for (const s of this.spinners) if (s.userData.spin) s.rotation.y += dt * 1.5;
    for (const m of this.far) {
      const h = m.userData.halo, p = m.userData.pulse || 0;
      if (p) m.userData.pulse = Math.max(0, p - dt * 1.8);
      h.visible = p > 0;
      h.scale.setScalar(1 + (1 - p) * 0.6);
      h.material.opacity = p * 0.8;
    }
    const o = this.orb;
    if (o.userData.bounce) {
      o.userData.bounce = Math.max(0, o.userData.bounce - dt * 2);
      o.position.y = TABLE_TOP + 0.24 + Math.sin(o.userData.bounce * Math.PI) * 0.06;
    }
    if (o.userData.burst) {
      o.userData.burst = Math.max(0, o.userData.burst - dt * 1.5);
      o.scale.setScalar(1 + o.userData.burst * 0.8);
      o.rotation.y += dt * 8 * o.userData.burst;
    }
    const b = this.bell;
    if (b.userData.ring) {
      b.userData.ring = Math.max(0, b.userData.ring - dt * 3);
      b.scale.setScalar(1 + 0.3 * b.userData.ring);
    }
  },
  exit(ctx) {
    ctx.app.logPanel.root.removeFromParent();
  }
};


// ============================================================================
// VibeXR Gallery v0.4 — the artworks.
// src/art/starry-night.js — "The Starry Night" (after Van Gogh, 1889), ported
// from rongxuanmu.github.io/Works/StarryNightWebXR.html into a VibeXR world:
// the painting rebuilt from ~24k sky dabs carried by vortices and ~20k land
// grains. All paint is unlit, so both eyes see the same touch of colour.
// ============================================================================
function buildStarryNight(THREE, root) {
  const MAXV = 8;
  const NSTAR = 11;

  const glslCommon = `
    const vec3 DEEP   = vec3(0.039, 0.086, 0.216);
    const vec3 COBALT = vec3(0.110, 0.247, 0.561);
    const vec3 SKY    = vec3(0.357, 0.576, 0.839);
    const vec3 PALE   = vec3(0.663, 0.784, 0.910);
    const vec3 GOLD   = vec3(0.965, 0.843, 0.420);
    const vec3 IVORY  = vec3(0.984, 0.945, 0.760);

    uniform float uTime;
    uniform vec3  uVDir[${MAXV}];
    uniform vec4  uVPar[${MAXV}];   // x strength, y radius, z spin sign, w phase
    uniform int   uVCount;
    uniform vec3  uStar[${NSTAR}];
    uniform vec2  uStarP[${NSTAR}]; // x angular size, y brightness
    uniform vec3  uMoon;

    float hash1(float n) { return fract(sin(n) * 43758.5453123); }
    float hash3(vec3 p) {
      p = fract(p * 0.3183099 + vec3(0.1, 0.2, 0.3));
      p *= 17.0;
      return fract(p.x * p.y * p.z * (p.x + p.y + p.z));
    }
    float noise3(vec3 p) {
      vec3 i = floor(p);
      vec3 f = fract(p);
      f = f * f * (3.0 - 2.0 * f);
      return mix(
        mix(mix(hash3(i), hash3(i + vec3(1,0,0)), f.x), mix(hash3(i + vec3(0,1,0)), hash3(i + vec3(1,1,0)), f.x), f.y),
        mix(mix(hash3(i + vec3(0,0,1)), hash3(i + vec3(1,0,1)), f.x), mix(hash3(i + vec3(0,1,1)), hash3(i + vec3(1,1,1)), f.x), f.y),
        f.z);
    }
    float fbm(vec3 p) {
      float a = 0.5, s = 0.0;
      for (int i = 0; i < 4; i++) {
        s += a * noise3(p);
        p = p * 2.03 + vec3(1.7, 9.2, 3.1);
        a *= 0.5;
      }
      return s;
    }
    vec3 rotAxis(vec3 v, vec3 ax, float a) {
      float c = cos(a), s = sin(a);
      return v * c + cross(ax, v) * s + ax * dot(ax, v) * (1.0 - c);
    }
    // The paint's colour field: where the sky is bright vs deep.
    float field(vec3 p) {
      vec3 q = p * 2.3;
      float n1 = fbm(q);
      float n2 = fbm(q + vec3(5.2, 1.3, 2.8));
      return smoothstep(0.30, 0.86, fbm(q + 1.7 * vec3(n1, n2, n1 * 0.6 + n2 * 0.4)));
    }
    vec3 paint(float v) {
      vec3 col = mix(DEEP * 0.8, COBALT, smoothstep(0.0, 0.6, v));
      col = mix(col, SKY,  smoothstep(0.55, 0.95, v) * 0.85);
      col = mix(col, PALE, smoothstep(0.9, 1.0, v) * 0.4);
      return col;
    }
    // Carry a point on the dome along the vortex field for 'age' seconds.
    vec3 advect(vec3 p, float age) {
      for (int i = 0; i < ${MAXV}; i++) {
        if (i >= uVCount) break;
        vec3 ax = uVDir[i];
        vec4 P  = uVPar[i];
        float ang  = acos(clamp(dot(p, ax), -1.0, 1.0));
        float fall = exp(-ang * ang / (2.0 * P.y * P.y));
        float rot  = fall * P.z * (P.x * 0.55 * age + P.x * 0.25 * sin(P.w + age * 0.7));
        p = rotAxis(p, ax, rot);
      }
      p = rotAxis(p, vec3(0.0, 1.0, 0.0), age * 0.012);       // the slow wind that turns the whole sky
      vec3 nz = vec3(noise3(p * 3.0 + 1.3), noise3(p * 3.0 + 7.1), noise3(p * 3.0 + 13.7)) - 0.5;
      return normalize(p + nz * 0.05 * min(age, 4.0));         // wandering, so the strokes don't stay in rank
    }`;

  /* ---------- the gloom: a dark, empty dome — every light in the scene is a particle ---------- */
  const skyVert = `
    varying vec3 vDir;
    void main() { vDir = position; gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0); }`;
  const skyFrag = `
    precision highp float;
    uniform float uAlpha;
    varying vec3 vDir;
    void main() {
      vec3 d = normalize(vDir);
      vec3 zenith  = vec3(0.008, 0.012, 0.035);
      vec3 horizon = vec3(0.028, 0.045, 0.095);
      vec3 col = mix(horizon, zenith, smoothstep(-0.05, 0.75, d.y));
      col = mix(col, vec3(0.006, 0.009, 0.02), smoothstep(0.02, -0.15, d.y));
      gl_FragColor = vec4(col, uAlpha);
    }`;

  /* ---------- the sky particles ---------- */
  // Small glowing balls carried by the flow, drawn as instanced low-poly spheres. A second population is
  // bound to the stars: it orbits each one, so the halos are made of the same stuff as the sky.
  const N_SKY = 20000;
  const N_STAR = 4200;
  const N = N_SKY + N_STAR;
  const DOME = 480.0;

  const glowFrag = `
    precision highp float;
    varying vec3  vColor;
    varying vec3  vNormal;
    varying vec3  vView;
    varying float vGlow;
    void main() {
      // Unlit: every dab is a flat touch of paint, identical in both eyes.
      gl_FragColor = vec4(vColor * vGlow * 0.72, 1.0);
    }`;

  const dabVert = `
    precision highp float;
    ${glslCommon}
    attribute float seed;        // per instance
    attribute float kind;        // 0 sky, 1 star-bound
    uniform float uSize;         // ball radius, world units at dome radius
    uniform int   uShapeA;       // 0 dome, 1 sphere, 2 cube — the shape we are leaving
    uniform int   uShapeB;       // the shape we are arriving at
    uniform float uBlend;        // 0 = all A, 1 = all B
    uniform vec3  uVolCenter;    // where the volumetric shapes float
    uniform float uVolR;         // their half-size, metres
    varying vec3  vColor;
    varying vec3  vNormal;
    varying vec3  vView;
    varying float vGlow;

    vec3 spawn(float s, float cycle) {
      float h1 = hash1(s * 91.7 + cycle * 13.1);
      float h2 = hash1(s * 57.3 + cycle * 7.3 + 3.0);
      float y  = mix(-0.12, 1.0, h1);
      float az = h2 * 6.2831853;
      float r  = sqrt(max(0.0, 1.0 - y * y));
      return vec3(r * cos(az), y, r * sin(az));
    }
    // a point inside the unit ball or the unit cube
    vec3 spawnVol(float s, float cycle, int shape) {
      float h1 = hash1(s * 91.7 + cycle * 13.1);
      float h2 = hash1(s * 57.3 + cycle * 7.3 + 3.0);
      float h3 = hash1(s * 73.9 + cycle * 3.7 + 7.0);
      if (shape == 2) return vec3(h1 * 2.0 - 1.0, mix(-0.3, 1.0, h2), h3 * 2.0 - 1.0);
      float y = mix(-0.3, 1.0, h1), az = h2 * 6.2831853, r = sqrt(max(0.0, 1.0 - y * y));
      return vec3(r * cos(az), y, r * sin(az)) * pow(h3, 0.3333);
    }
    vec3 confine(vec3 p, int shape) {
      if (shape == 2) return clamp(p, -1.0, 1.0);                // grains pile up on the faces: the cube reads as a cube
      return p / max(1.0, length(p));
    }
    // the same vortex field, but filling a volume: falloff by distance from the axis line
    vec3 advectVol(vec3 p, float age, int shape) {
      for (int i = 0; i < ${MAXV}; i++) {
        if (i >= uVCount) break;
        vec3 ax = uVDir[i];
        vec4 P  = uVPar[i];
        float d = length(p - ax * dot(p, ax));
        float fall = exp(-d * d / (2.0 * P.y * P.y));
        float rot  = fall * P.z * (P.x * 0.55 * age + P.x * 0.25 * sin(P.w + age * 0.7));
        p = rotAxis(p, ax, rot);
      }
      p = rotAxis(p, vec3(0.0, 1.0, 0.0), age * 0.012);
      vec3 nz = vec3(noise3(p * 3.0 + 1.3), noise3(p * 3.0 + 7.1), noise3(p * 3.0 + 13.7)) - 0.5;
      return confine(p + nz * 0.05 * min(age, 4.0), shape);
    }
    vec3 turntable(vec3 p) { return rotAxis(p, vec3(0.0, 1.0, 0.0), uTime * 0.07); }

    // Where does a sky particle sit, for a given shape? World head/tail, radius, the shape's normal, colour field.
    void placeSky(int shape, float age, float cycle, float size, out vec3 hp, out vec3 tp, out float w, out vec3 nrm, out float maxLen, out float hfade, out float v) {
      if (shape == 0) {
        vec3 p0 = spawn(seed, cycle);
        vec3 head = advect(p0, age);
        vec3 tail = advect(p0, max(age - 0.12, 0.0));
        float R = ${DOME.toFixed(1)} * mix(0.55, 1.0, hash1(seed * 6.3));
        hp = head * R; tp = tail * R; w = size * R / ${DOME.toFixed(1)}; nrm = head;
        maxLen = R * 0.2; hfade = smoothstep(-0.16, -0.02, head.y); v = field(p0);
      } else {
        vec3 p0 = spawnVol(seed, cycle, shape);
        vec3 head = turntable(advectVol(p0, age, shape));
        vec3 tail = turntable(advectVol(p0, max(age - 0.12, 0.0), shape));
        hp = uVolCenter + head * uVolR; tp = uVolCenter + tail * uVolR;
        w = size * uVolR * 0.0065; nrm = normalize(head + vec3(0.0, 1e-4, 0.0));
        maxLen = uVolR * 0.3; hfade = 1.0; v = field(p0 * 1.6);
      }
    }
    void placeStar(int shape, vec3 head, vec3 tail, float size, out vec3 hp, out vec3 tp, out float w, out vec3 nrm, out float maxLen) {
      if (shape == 0) {
        float R = ${DOME.toFixed(1)} * mix(0.6, 0.95, hash1(seed * 6.3));
        hp = head * R; tp = tail * R; w = size * R / ${DOME.toFixed(1)}; nrm = head; maxLen = R * 0.2;
      } else {
        vec3 h = turntable(head), t = turntable(tail);
        float rr = uVolR * mix(0.45, 0.62, hash1(seed * 6.3));
        hp = uVolCenter + h * rr; tp = uVolCenter + t * rr;
        w = size * uVolR * 0.0055; nrm = h; maxLen = uVolR * 0.3;
      }
    }

    void main() {
      float life  = mix(4.0, 8.0, hash1(seed * 3.1));
      float u     = uTime / life + seed;
      float cycle = floor(u);
      float age   = fract(u) * life;
      float f     = fract(u);
      float e     = smoothstep(0.0, 1.0, uBlend);

      vec3 hp, tp, nrm, col;
      float w, maxLen, hfade, glow;

      if (kind < 0.5) {
        float size = uSize * (0.6 + 0.8 * hash1(seed * 4.4));
        float v;
        placeSky(uShapeA, age, cycle, size, hp, tp, w, nrm, maxLen, hfade, v);
        if (uBlend > 0.001) {
          vec3 hp2, tp2, nrm2; float w2, maxLen2, hfade2, v2;
          placeSky(uShapeB, age, cycle, size, hp2, tp2, w2, nrm2, maxLen2, hfade2, v2);
          hp = mix(hp, hp2, e); tp = mix(tp, tp2, e); w = mix(w, w2, e); nrm = normalize(mix(nrm, nrm2, e));
          maxLen = max(maxLen, maxLen2) * 4.0; hfade = mix(hfade, hfade2, e); v = mix(v, v2, e);
        }
        col = paint(v) * 1.15 + SKY * 0.25 * smoothstep(0.6, 1.0, v);
        col *= 0.8 + 0.4 * hash1(seed * 2.3);
        glow = mix(0.7, 1.7, smoothstep(0.3, 1.0, v));           // the bright paint carries the light
      } else {
        // pick a light (11 stars + the moon), settle at some distance around it, orbit it
        float pick = floor(hash1(seed * 17.9) * 12.0);
        vec3 c = uMoon; float sz = 0.085; float br = 1.2;
        for (int i = 0; i < ${NSTAR}; i++) { if (float(i) == pick) { c = uStar[i]; sz = uStarP[i].x; br = uStarP[i].y; } }
        float h1 = hash1(seed * 31.3 + cycle * 5.7), h2 = hash1(seed * 43.1 + cycle * 9.1);
        float rho = sz * (0.25 + 2.6 * pow(h1, 0.7));               // denser near the core
        float th  = h2 * 6.2831853;
        vec3 t1 = normalize(cross(c, abs(c.y) < 0.9 ? vec3(0.0, 1.0, 0.0) : vec3(1.0, 0.0, 0.0)));
        vec3 t2 = cross(c, t1);
        vec3 p0 = normalize(c + (t1 * cos(th) + t2 * sin(th)) * rho);
        float omega = 0.9 / (rho / sz + 0.35);                     // the inner ring turns faster
        vec3 head = advect(rotAxis(p0, c, omega * age), age * 0.25);
        vec3 tail = advect(rotAxis(p0, c, omega * max(age - 0.12, 0.0)), max(age - 0.12, 0.0) * 0.25);
        float close = 1.0 - clamp(rho / (sz * 2.9), 0.0, 1.0);
        col = mix(GOLD * 0.9, IVORY, close * close) * br;
        glow = mix(0.9, 2.2, close) * br;
        float size = uSize * (0.5 + 0.9 * hash1(seed * 4.4)) * mix(0.8, 1.4, close);
        placeStar(uShapeA, head, tail, size, hp, tp, w, nrm, maxLen);
        if (uBlend > 0.001) {
          vec3 hp2, tp2, nrm2; float w2, maxLen2;
          placeStar(uShapeB, head, tail, size, hp2, tp2, w2, nrm2, maxLen2);
          hp = mix(hp, hp2, e); tp = mix(tp, tp2, e); w = mix(w, w2, e); nrm = normalize(mix(nrm, nrm2, e));
          maxLen = max(maxLen, maxLen2) * 4.0;
        }
        hfade = smoothstep(-0.16, -0.02, head.y);
      }
      vColor = col;
      vGlow = glow;

      float fade = smoothstep(0.0, 0.12, f) * (1.0 - smoothstep(0.78, 1.0, f)) * hfade;

      vec3 seg = hp - tp;
      float len = length(seg);
      vec3 flow = len > 1e-5 ? seg / len : normalize(cross(nrm, vec3(0.0, 1.0, 0.0)) + vec3(1e-4, 0.0, 0.0));
      if (len > maxLen) fade = 0.0;
      vec3 sideRaw = cross(nrm, flow);
      vec3 side = length(sideRaw) > 1e-3 ? normalize(sideRaw) : normalize(cross(flow, vec3(0.0, 1.0, 0.01)));
      vec3 out_ = cross(flow, side);
      vec3 sc = vec3(w + len * 0.35, w, w) * fade;                 // a ball, stretched a little when it moves fast
      mat3 basis = mat3(flow, side, out_);
      vec3 wp = (hp + tp) * 0.5 + basis * (position * sc);
      vNormal = normalize(basis * (normal / max(sc, vec3(1e-4))));
      vView = -(modelViewMatrix * vec4(wp, 1.0)).xyz;
      gl_Position = projectionMatrix * modelViewMatrix * vec4(wp, 1.0);
    }`;

  // Everything else in the scene — ground, hills, village, cypress — is a cloud of still particles.
  const sceneVert = `
    precision highp float;
    attribute vec3  ipos;
    attribute vec3  icol;
    attribute vec2  iparam;      // x radius, y glow
    attribute float seed;
    uniform float uTime;
    uniform float uLandMix;      // 0 = the land at true scale around you, 1 = a diorama inside the volume
    uniform vec3  uVolCenter;
    uniform float uVolR;
    varying vec3  vColor;
    varying vec3  vNormal;
    varying vec3  vView;
    varying float vGlow;
    // Fold 300 m of landscape into the volume: distance is compressed r/(r+40), so the cypress stays
    // near the middle, the village sits halfway out and the hills ring the rim.
    vec3 diorama(vec3 p) {
      float k = 40.0;
      float rr = length(p.xz);
      vec2 xz = p.xz / max(rr, 1e-3) * (uVolR * 0.92 * rr / (rr + k));
      float y = uVolR * 0.9 * (max(p.y, 0.0) / (max(p.y, 0.0) + k)) - uVolR * 0.55;
      vec3 q = vec3(xz.x, y, xz.y);
      float a = uTime * 0.07; float c = cos(a), sn = sin(a);            // same turntable as the sky
      q = vec3(q.x * c + q.z * sn, q.y, -q.x * sn + q.z * c);
      return uVolCenter + q;
    }
    void main() {
      // breathing: a slow wave that travels through each object, a sway that grows with height,
      // and a little per-grain flicker on top, so trees and houses feel alive without wandering
      float wave = sin(uTime * 0.7 + ipos.x * 0.18 + ipos.z * 0.14 + ipos.y * 0.45);
      float sway = sin(uTime * 0.45 + ipos.x * 0.05 + ipos.z * 0.05);
      float jit  = sin(uTime * (1.2 + seed * 1.6) + seed * 40.0);
      float amp  = iparam.x * 1.6;
      vec3 p = ipos
             + vec3(sway * ipos.y * 0.025, wave * amp * 0.9 + jit * amp * 0.35, sway * ipos.y * 0.012);
      float r = iparam.x * (0.85 + 0.2 * (0.5 + 0.5 * wave) + 0.08 * jit);
      if (uLandMix > 0.001) {
        float rv = (0.0011 + iparam.x * 0.0012) * (0.8 + 0.4 * seed) * uVolR * 1.6;
        p = mix(p, diorama(p), uLandMix);
        r = mix(r, rv, uLandMix);
      }
      vec3 wp = p + position * r;
      vNormal = normal;
      vColor = icol;
      vGlow = iparam.y;
      vec4 mv = modelViewMatrix * vec4(wp, 1.0);
      vView = -mv.xyz;
      gl_Position = projectionMatrix * mv;
    }`;

  const starDirs = [
    [ 0.18, 0.62, -0.76], [ 0.52, 0.48, -0.70], [-0.30, 0.55, -0.78], [-0.62, 0.40, -0.68],
    [ 0.80, 0.30, -0.52], [-0.05, 0.80, -0.60], [-0.85, 0.22, -0.48], [ 0.40, 0.20, -0.89],
    [ 0.62, 0.72,  0.31], [-0.55, 0.66,  0.51], [ 0.10, 0.45,  0.89]
  ].map(a => new THREE.Vector3(...a).normalize());
  const starParams = [
    [0.075, 1.15], [0.060, 1.0], [0.055, 0.95], [0.065, 1.05],
    [0.050, 0.9],  [0.045, 0.85], [0.052, 0.8], [0.040, 0.9],
    [0.058, 0.9],  [0.050, 0.85], [0.044, 0.8]
  ].map(a => new THREE.Vector2(a[0], a[1]));

  const shared = {
    uTime:   { value: 0 },
    uVDir:   { value: Array.from({ length: MAXV }, () => new THREE.Vector3(0, 1, 0)) },
    uVPar:   { value: Array.from({ length: MAXV }, () => new THREE.Vector4(0, 0.3, 1, 0)) },
    uVCount: { value: 0 },
    uStar:   { value: starDirs },
    uStarP:  { value: starParams },
    uMoon:   { value: new THREE.Vector3(0.82, 0.52, -0.25).normalize() }
  };

  const sky = new THREE.Mesh(
    new THREE.SphereGeometry(500, 48, 32),
    new THREE.ShaderMaterial({ uniforms: Object.assign({ uAlpha: { value: 1 } }, shared), vertexShader: skyVert, fragmentShader: skyFrag, side: THREE.BackSide, depthWrite: false, fog: false })
  );
  sky.frustumCulled = false;
  sky.renderOrder = -2;
  root.add(sky);

  const ballGeo = new THREE.SphereGeometry(1, 5, 3);
  const dabGeo = new THREE.InstancedBufferGeometry().copy(ballGeo);
  {
    const seeds = new Float32Array(N), kinds = new Float32Array(N);
    for (let i = 0; i < N; i++) { seeds[i] = (i + 0.5) / N; kinds[i] = i < N_SKY ? 0 : 1; }
    dabGeo.setAttribute('seed', new THREE.InstancedBufferAttribute(seeds, 1));
    dabGeo.setAttribute('kind', new THREE.InstancedBufferAttribute(kinds, 1));
    dabGeo.instanceCount = N;
  }
  const VOL_CENTER = new THREE.Vector3(0, 1.75, -2.1);
  const VOL_R = 0.62;
  const dabUniforms = Object.assign({
    uSize: { value: 1.35 },
    uShapeA: { value: 0 }, uShapeB: { value: 0 }, uBlend: { value: 0 },
    uVolCenter: { value: VOL_CENTER }, uVolR: { value: VOL_R }
  }, shared);
  const dabs = new THREE.Mesh(dabGeo, new THREE.ShaderMaterial({ uniforms: dabUniforms, vertexShader: dabVert, fragmentShader: glowFrag, fog: false }));
  dabs.frustumCulled = false;
  root.add(dabs);

  /* ---------- vortices ---------- */
  const builtin = [
    { dir: new THREE.Vector3( 0.30, 0.50, -0.81).normalize(), strength: 1.25, radius: 0.48, sign:  1, phase: 0.0 },
    { dir: new THREE.Vector3(-0.60, 0.36, -0.72).normalize(), strength: 0.85, radius: 0.32, sign: -1, phase: 2.1 },
    { dir: new THREE.Vector3( 0.55, 0.42,  0.72).normalize(), strength: 0.70, radius: 0.38, sign:  1, phase: 4.0 }
  ];
  const userVortices = [];

  function beginVortex(dir, sign) {
    const v = { dir: dir.clone().normalize(), strength: 0.05, radius: 0.26, sign: sign || 1, phase: Math.random() * 6.28, held: true };
    userVortices.push(v);
    while (userVortices.length > MAXV - builtin.length) userVortices.shift();
    return v;
  }
  function updateVortices(dt, time) {
    for (let i = userVortices.length - 1; i >= 0; i--) {
      const v = userVortices[i];
      if (v.held) {
        v.strength = Math.min(2.4, v.strength + dt * 1.0);
        v.radius   = Math.min(0.42, v.radius + dt * 0.05);
        v.phase   += dt * 3.0;
      } else {
        v.strength *= Math.exp(-dt / 7.0);
        v.phase   += dt * 0.6;
        if (v.strength < 0.02) { userVortices.splice(i, 1); continue; }
      }
    }
    const all = builtin.concat(userVortices);
    shared.uVCount.value = all.length;
    for (let i = 0; i < all.length; i++) {
      const v = all[i];
      shared.uVDir.value[i].copy(v.dir);
      const ph = v.held !== undefined ? v.phase : time * 0.45 + v.phase;
      shared.uVPar.value[i].set(v.strength, v.radius, v.sign, ph);
    }
  }

  /* ---------- the land, as particles ---------- */
  const cloud = { pos: [], col: [], par: [], seed: [] };
  const C = new THREE.Color();
  const rnd = (a, b) => a + Math.random() * (b - a);
  function drop(x, y, z, hex, radius, glow, jitter) {
    C.setHex(hex);
    const j = 0.82 + Math.random() * 0.36;                 // no two grains the same value
    cloud.pos.push(x, y, z);
    cloud.col.push(C.r * j, C.g * j, C.b * j);
    cloud.par.push(radius * rnd(0.7, 1.3), glow * rnd(0.8, 1.2));
    cloud.seed.push(Math.random());
  }
  // ground: a dark meadow that thins with distance
  for (let i = 0; i < 7000; i++) {
    const r = 3 + 320 * Math.pow(Math.random(), 1.6), a = Math.random() * Math.PI * 2;
    drop(Math.cos(a) * r, 0.05 + Math.random() * 0.25, Math.sin(a) * r, i % 7 === 0 ? 0x3a6bc4 : 0x1c3f8f, 0.07 + r * 0.009, 0.5, 0);
  }
  // hills: grains on the upper skin of each ellipsoid
  [[-140, 0, -230, 190, 26, 70], [60, 0, -260, 240, 34, 90], [200, 0, -190, 150, 18, 60],
   [-260, 0, -120, 160, 22, 60], [120, 0, 220, 220, 30, 90], [-150, 0, 260, 200, 24, 80]].forEach(h => {
    for (let i = 0; i < 1400; i++) {
      const a = Math.random() * Math.PI * 2, e = Math.acos(Math.random());  // upper hemisphere
      const x = Math.cos(a) * Math.sin(e), y = Math.cos(e), z = Math.sin(a) * Math.sin(e);
      drop(h[0] + x * h[3], y * h[4] + 0.3, h[2] + z * h[5], y > 0.85 ? 0x4a7fc8 : 0x24509e, 1.0 + h[3] * 0.004, 0.65, 0);
    }
  });
  // village: walls, roofs, and lit windows
  [[-22, -95, 4, 3.5], [-12, -100, 5, 4], [-2, -96, 4.5, 3.6], [8, -102, 6, 4.2], [18, -97, 4, 3.4], [30, -104, 5, 3.8], [-34, -104, 4.6, 3.2]].forEach(h => {
    const [cx, cz, w, ht] = h, d = w * 0.8;
    for (let i = 0; i < 260; i++) {
      const face = Math.floor(Math.random() * 4);
      const u = Math.random() - 0.5, v = Math.random();
      const x = face < 2 ? cx + (face === 0 ? -w / 2 : w / 2) : cx + u * w;
      const z = face < 2 ? cz + u * d : cz + (face === 2 ? -d / 2 : d / 2);
      drop(x, v * ht, z, Math.random() < 0.2 ? 0x8a7a5a : 0x3e5aa6, 0.18, 0.9, 0);
    }
    for (let i = 0; i < 120; i++) {                        // roof: a squat pyramid
      const v = Math.random(), a = Math.random() * Math.PI * 2, rr = (1 - v) * w * 0.75;
      drop(cx + Math.cos(a) * rr, ht + v * ht * 0.6, cz + Math.sin(a) * rr, 0x6a5a8a, 0.18, 0.9, 0);
    }
    for (let k = 0; k < 2; k++) for (let i = 0; i < 6; i++) // windows: warm grains, brighter
      drop(cx - w * 0.25 + k * w * 0.5 + rnd(-0.25, 0.25), ht * 0.45 + rnd(-0.3, 0.3), cz + d / 2 + 0.12, 0xf6d76b, 0.15, 3.0, 0);
  });
  for (let i = 0; i < 400; i++) {                          // church and spire
    const v = Math.random(), a = Math.random() * Math.PI * 2;
    if (i < 160) drop(3 + Math.cos(a) * 2.5, v * 7, -112 + Math.sin(a) * 2.5, 0x3e5aa6, 0.2, 0.9, 0);
    else { const rr = (1 - v) * 2.2; drop(3 + Math.cos(a) * rr, 7 + v * 16, -112 + Math.sin(a) * rr, 0x6a5a8a, 0.2, 1.0, 0); }
  }
  // the cypress: a flame of dark green grains, dense at the core
  {
    const tiers = 13; let y = 0;
    for (let t = 0; t < tiers; t++) {
      const f = t / (tiers - 1);
      const r = (1.5 * (1 - f) * (1 - f * 0.3) + 0.12) * 1.6, h = (2.0 - f * 0.5) * 1.6;
      const ox = Math.sin(t * 1.7) * 0.19, oz = Math.cos(t * 1.3) * 0.16;
      for (let i = 0; i < 300; i++) {
        const v = Math.random(), a = Math.random() * Math.PI * 2, rr = (1 - v) * r * Math.sqrt(Math.random() * 0.6 + 0.4);
        drop(-9.5 + ox + Math.cos(a) * rr, y + v * h, -17 + oz + Math.sin(a) * rr, Math.random() < 0.2 ? 0x246b42 : 0x0d3320, 0.16 + (1 - f) * 0.06, 1.0, 0);
      }
      y += h * 0.55;
    }
  }
  const sceneGeo = new THREE.InstancedBufferGeometry().copy(ballGeo);
  sceneGeo.setAttribute('ipos', new THREE.InstancedBufferAttribute(new Float32Array(cloud.pos), 3));
  sceneGeo.setAttribute('icol', new THREE.InstancedBufferAttribute(new Float32Array(cloud.col), 3));
  sceneGeo.setAttribute('iparam', new THREE.InstancedBufferAttribute(new Float32Array(cloud.par), 2));
  sceneGeo.setAttribute('seed', new THREE.InstancedBufferAttribute(new Float32Array(cloud.seed), 1));
  sceneGeo.instanceCount = cloud.seed.length;
  const landUniforms = { uTime: shared.uTime, uLandMix: { value: 0 }, uVolCenter: dabUniforms.uVolCenter, uVolR: dabUniforms.uVolR };
  const land = new THREE.Mesh(sceneGeo, new THREE.ShaderMaterial({ uniforms: landUniforms, vertexShader: sceneVert, fragmentShader: glowFrag, fog: false }));
  land.frustumCulled = false;
  root.add(land);
  /* ---------- shapes: the sky as a dome around you, or as a globe / block you can hold ---------- */
  const VOL_R0 = VOL_R;
  const frameMat = new THREE.LineBasicMaterial({ color: 0xa9c8e8, transparent: true, opacity: 0 });
  const cubeFrame = new THREE.LineSegments(new THREE.EdgesGeometry(new THREE.BoxGeometry(VOL_R * 2, VOL_R * 2, VOL_R * 2)), frameMat.clone());
  const sphereFrame = new THREE.Group();
  for (let k = 0; k < 3; k++) {
    const ring = new THREE.LineLoop(new THREE.BufferGeometry().setFromPoints(
      Array.from({ length: 96 }, (_, i) => { const a = i / 96 * Math.PI * 2; return new THREE.Vector3(Math.cos(a) * VOL_R, 0, Math.sin(a) * VOL_R); })), frameMat.clone());
    if (k === 1) ring.rotation.x = Math.PI / 2; if (k === 2) ring.rotation.z = Math.PI / 2;
    sphereFrame.add(ring);
  }
  cubeFrame.position.copy(VOL_CENTER); sphereFrame.position.copy(VOL_CENTER);
  cubeFrame.userData.noCollider = sphereFrame.userData.noCollider = true;
  root.add(cubeFrame, sphereFrame);

  const SHAPES = ['Dome', 'Sphere', 'Cube'];
  const shape = { current: 0, target: 0, blend: 0, animating: false, held: false };
  function setShape(idx) {
    if (idx === shape.target) return;
    shape.current = shape.target;
    shape.target = idx; shape.blend = 0; shape.animating = true;
    dabUniforms.uShapeA.value = shape.current;
    dabUniforms.uShapeB.value = shape.target;
    dabUniforms.uBlend.value = 0;
  }
  function updateShape(dt) {
    if (!shape.animating) return;
    shape.blend = Math.min(1, shape.blend + dt / 1.8);
    dabUniforms.uBlend.value = shape.blend;
    if (shape.blend >= 1) {
      shape.animating = false; shape.current = shape.target;
      dabUniforms.uShapeA.value = shape.current; dabUniforms.uBlend.value = 0;
    }
  }
  function placeVolume(x, y, z, r) {
    VOL_CENTER.set(x, y, z);
    if (r) dabUniforms.uVolR.value = r;
    syncFrames();
  }
  function syncFrames() {
    const r = dabUniforms.uVolR.value;
    cubeFrame.position.copy(VOL_CENTER); sphereFrame.position.copy(VOL_CENTER);
    cubeFrame.scale.setScalar(r / VOL_R0); sphereFrame.scale.setScalar(r / VOL_R0);
  }
  // the volumetric modes pull the whole landscape into the volume; the gloom dome goes with it
  function updateFrames(time, alpha) {
    const volA = shape.current > 0 ? 1 : 0, volB = shape.target > 0 ? 1 : 0;
    const eb = shape.animating ? shape.blend * shape.blend * (3 - 2 * shape.blend) : 1;
    const landMix = shape.animating ? volA + (volB - volA) * eb : volB;
    landUniforms.uLandMix.value = landMix;
    sky.visible = alpha > 0.01 && landMix < 0.999;
    sky.material.uniforms.uAlpha.value = alpha;
    if (sky.material.transparent !== (alpha < 0.999)) { sky.material.transparent = alpha < 0.999; sky.material.needsUpdate = true; }
    cubeFrame.rotation.y = sphereFrame.rotation.y = time * 0.07;
    const e = shape.animating ? shape.blend : 1;
    const wA = shape.animating ? 1 - e : 0, wB = e;
    const op = (idx) => 0.3 * ((shape.current === idx ? wA : 0) + (shape.target === idx ? wB : 0));
    const held = shape.held ? 2.2 : 1;
    cubeFrame.material.opacity = op(2) * held;
    sphereFrame.children.forEach(r => { r.material.opacity = op(1) * 0.7 * held; });
    syncFrames();
  }
  // A pointing ray means a direction on the dome, but an axis through the centre of a volume.
  const _closest = new THREE.Vector3();
  function aimAxis(origin, dir) {
    if (shape.target === 0) return dir.clone().normalize();
    const t = Math.max(0, _closest.copy(VOL_CENTER).sub(origin).dot(dir));
    _closest.copy(origin).addScaledVector(dir, t).sub(VOL_CENTER);
    return _closest.lengthSq() < 1e-6 ? dir.clone().normalize() : _closest.clone().normalize();
  }

  return { shared, sky, dabs, land, dabUniforms, landUniforms, beginVortex, updateVortices, userVortices, builtin,
           shape, setShape, updateShape, updateFrames, placeVolume, aimAxis, N: N + cloud.seed.length };
}

// ============================================================================
// src/art/impression-sunrise.js — "Impression, Sunrise" (after Claude Monet,
// Le Havre, 1872), ported from rongxuanmu.github.io/Works/MonetSunriseWebXR.html
// into a VibeXR world. Same painting-unit scene, same three modes (Globe, Cube,
// Immersive) and the same pinch effects; the framework supplies the hands, the
// menu and the session, and every shader now solves per eye.
// ============================================================================
function buildMonet(THREE, root, app) {
  const CAM = app.camera;
  const world = new THREE.Group();
  root.add(world);
  let MODE = "globe";
  const FX = { pinch: "whirl", accelerate: true, mist: true, sunUp: false };
  let onModeChanged = () => {};
// ── Palette (sampled from the painting) ──────────────────────────
const C = (h) => new THREE.Color(h);
const PAL = {
  hazeBlue: [C(0x7a8fb5), C(0x8fa2c4), C(0x9fb0cc), C(0x6f86ad), C(0xa9b4cf)],
  hazeTeal: [C(0x7d9db0), C(0x8aa9b8)],
  peach: [C(0xe9a173), C(0xf0b088), C(0xd98a5e), C(0xe8987a), C(0xf2c39c)],
  water: [C(0x5d78a6), C(0x7590bb), C(0x94a8c6), C(0x4b6892), C(0x6a8ba2), C(0x849bc0), C(0xb6bfcf)],
  waterCream: [C(0xd9d1c2), C(0xc9c3b8)],
  sun: C(0xff4d1c),
  reflect: [C(0xff6a32), C(0xf07a3a), C(0xe85a2a), C(0xff8c48), C(0xd8552c)],
  reflectDark: [C(0x3a4f77), C(0x2f4468)],
  ink: [C(0x1b2436), C(0x25324a), C(0x2c3b58), C(0x3a4a68)],
  mast: [C(0x5c6f96), C(0x6a7ca2), C(0x53668e)],
};
const pick = (a) => a[(Math.random() * a.length) | 0];
const jitter = (c, amt) => {
  const o = c.clone();
  o.r = THREE.MathUtils.clamp(o.r + (Math.random() - 0.5) * amt, 0, 1);
  o.g = THREE.MathUtils.clamp(o.g + (Math.random() - 0.5) * amt, 0, 1);
  o.b = THREE.MathUtils.clamp(o.b + (Math.random() - 0.5) * amt, 0, 1);
  return o;
};

// ── Painting-unit geometry ───────────────────────────────────────
const R = 40;             // hemisphere radius (painting units)
const WATER_Y = -0.02;
const SUN_AZ = 0.10;      // sun slightly right of "forward" (-z)
let sunElev = 0.155, sunElevTarget = 0.155;

const GLOBE_SCALE = 0.8 / (R * 2);   // 0.8 m diameter
const globePose = { pos: new THREE.Vector3(0, 1.05, -0.55), yaw: 0, scale: 1 };
// Cube option: a diorama box around the same scene. x ±BOX_HW, y 0..BOX_H, z BOX_ZF (front) .. BOX_ZB (back)
const BOX_HW = 30, BOX_H = 30, BOX_ZF = 6, BOX_ZB = -42;
const isWidget = () => MODE === 'globe' || MODE === 'cube';
const inBox = (x, y, z) => Math.abs(x) < BOX_HW && y > -1 && y < BOX_H && z < BOX_ZF && z > BOX_ZB;
const inDisc = (x, z) => x * x + z * z < (R - 0.8) * (R - 0.8);

function applyMode() {
  if (isWidget()) {
    world.scale.setScalar(GLOBE_SCALE * globePose.scale);
    world.position.copy(globePose.pos);
    world.rotation.set(0, globePose.yaw, 0);
  } else {
    world.scale.setScalar(1); world.position.set(0, 0, 0); world.rotation.set(0, 0, 0);
  }
  world.updateMatrixWorld(true);
  skyDome.visible = MODE === 'immersive';
  bigWater.visible = MODE === 'immersive';
  globeSky.visible = MODE === 'globe';
  waterDisc.visible = MODE === 'globe';
  glass.visible = MODE === 'globe';
  base.visible = MODE === 'globe';
  backWall.visible = MODE === 'cube';
  boxFloor.visible = MODE === 'cube';
  frame.visible = MODE === 'cube';
  sky.mesh.material.uniforms.uHemiFade.value = MODE === 'globe' ? 1 : 0;
  placeSun();
  buildSky();
  buildSil();
  applyRegion();
  onModeChanged();
}
// show only the strokes that fall inside the active volume (disc for globe/immersive, box for cube)
function applyRegion() {
  const test = MODE === 'cube' ? (x, y, z) => inBox(x, y, z) : (x, y, z) => inDisc(x, z);
  for (const L of [water, refl, mist]) {
    for (let i = 0; i < L.n; i++) { const i3 = i * 3; L.alpha[i] = test(L.home[i3], L.home[i3 + 1], L.home[i3 + 2]) ? L.baseAlpha[i] : 0; L.regionMask[i] = L.alpha[i] > 0 ? 1 : 0; }
    L.flush();
  }
}
const U = () => 1 / world.scale.x;   // painting units per metre

const sunPos = new THREE.Vector3();
function placeSun() {
  if (MODE === 'cube') {
    const y = THREE.MathUtils.clamp(2.5 + Math.sin(sunElev) * 60, 4, BOX_H - 3);
    sunPos.set(Math.tan(SUN_AZ) * -BOX_ZB, y, BOX_ZB + 1.2);
    sun.position.copy(sunPos); sunHalo.position.copy(sunPos);
    sun.rotation.set(0, 0, 0); sunHalo.rotation.set(0, 0, 0);
    backWall.material.uniforms.uSun.value.set(sunPos.x, sunPos.y);
    return;
  }
  const r = R - 0.6;
  sunPos.set(Math.sin(SUN_AZ) * Math.cos(sunElev) * r, Math.sin(sunElev) * r, -Math.cos(SUN_AZ) * Math.cos(sunElev) * r);
  sun.position.copy(sunPos); sunHalo.position.copy(sunPos);
  sun.lookAt(0, 0, 0); sunHalo.lookAt(0, 0, 0);
}

// ── Brushstroke shader ───────────────────────────────────────────
const vsStroke = `
  attribute vec3 iPos; attribute vec3 iCol; attribute vec2 iSize;
  attribute float iRot; attribute float iAlpha; attribute float iSeed;
  uniform float uHemiFade;
  varying vec2 vUv; varying vec3 vCol; varying float vAlpha; varying float vSeed;
  void main() {
    vUv = position.xy; vCol = iCol; vSeed = iSeed;
    vec4 c = modelViewMatrix * vec4(iPos, 1.0);
    float cs = cos(iRot), sn = sin(iRot);
    float s = length(modelMatrix[0].xyz);
    vec2 off = vec2(position.x * iSize.x, position.y * iSize.y) * s;
    off = vec2(off.x * cs - off.y * sn, off.x * sn + off.y * cs);
    c.xy += off;
    gl_Position = projectionMatrix * c;
    // globe mode: strokes on the near side of the dome fade so you can see in
    vec3 ctrV = (modelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
    float facing = dot(normalize(c.xyz - ctrV), normalize(-ctrV));
    float fade = 1.0 - smoothstep(-0.15, 0.45, facing);
    vAlpha = iAlpha * mix(1.0, fade, uHemiFade);
  }`;
const fsStroke = `
  varying vec2 vUv; varying vec3 vCol; varying float vAlpha; varying float vSeed;
  float hash(vec2 p){ return fract(sin(dot(p, vec2(127.1, 311.7)) + vSeed) * 43758.5453); }
  void main() {
    vec2 q = vUv * 2.0;
    float d = q.x * q.x + q.y * q.y;
    float n = hash(floor(vUv * vec2(14.0, 5.0)));
    float edge = 1.0 - 0.28 * n;
    float a = 1.0 - smoothstep(edge * 0.30, edge, d);
    if (a * vAlpha < 0.01) discard;
    float streak = 0.97 + 0.03 * sin((vUv.x * 9.0 + vSeed) * 3.14159);
    float ends = 1.0 - 0.12 * smoothstep(0.55, 1.0, abs(q.x));
    gl_FragColor = vec4(vCol * streak * ends, a * vAlpha);
  }`;

class StrokeLayer {
  constructor(count, { blending = THREE.NormalBlending, renderOrder = 0, depthTest = true, depthWrite = false, parent = world } = {}) {
    this.n = count;
    this.home = new Float32Array(count * 3); this.pos = new Float32Array(count * 3);
    this.vel = new Float32Array(count * 3); this.col = new Float32Array(count * 3);
    this.base = new Float32Array(count * 3); this.size = new Float32Array(count * 2);
    this.rot = new Float32Array(count); this.rotHome = new Float32Array(count);
    this.alpha = new Float32Array(count); this.baseAlpha = new Float32Array(count);
    this.seed = new Float32Array(count); this.phase = new Float32Array(count); this.regionMask = new Float32Array(count).fill(1);
    const g = new THREE.InstancedBufferGeometry();
    const quad = new THREE.PlaneGeometry(1, 1);
    g.index = quad.index; g.setAttribute('position', quad.getAttribute('position'));
    this.aPos = new THREE.InstancedBufferAttribute(this.pos, 3).setUsage(THREE.DynamicDrawUsage);
    this.aCol = new THREE.InstancedBufferAttribute(this.col, 3).setUsage(THREE.DynamicDrawUsage);
    this.aSize = new THREE.InstancedBufferAttribute(this.size, 2).setUsage(THREE.DynamicDrawUsage);
    this.aRot = new THREE.InstancedBufferAttribute(this.rot, 1).setUsage(THREE.DynamicDrawUsage);
    this.aAlp = new THREE.InstancedBufferAttribute(this.alpha, 1).setUsage(THREE.DynamicDrawUsage);
    this.aSeed = new THREE.InstancedBufferAttribute(this.seed, 1).setUsage(THREE.DynamicDrawUsage);
    g.setAttribute('iPos', this.aPos); g.setAttribute('iCol', this.aCol); g.setAttribute('iSize', this.aSize);
    g.setAttribute('iRot', this.aRot); g.setAttribute('iAlpha', this.aAlp); g.setAttribute('iSeed', this.aSeed);
    g.instanceCount = count;
    const m = new THREE.ShaderMaterial({
      vertexShader: vsStroke, fragmentShader: fsStroke, uniforms: { uHemiFade: { value: 0 } },
      transparent: true, depthWrite, depthTest, blending, side: THREE.DoubleSide,
    });
    this.mesh = new THREE.Mesh(g, m);
    this.mesh.frustumCulled = false; this.mesh.renderOrder = renderOrder;
    parent.add(this.mesh);
  }
  set(i, x, y, z, color, w, h, rot, alpha) {
    const i3 = i * 3;
    this.home[i3] = this.pos[i3] = x; this.home[i3 + 1] = this.pos[i3 + 1] = y; this.home[i3 + 2] = this.pos[i3 + 2] = z;
    this.vel[i3] = this.vel[i3 + 1] = this.vel[i3 + 2] = 0;
    this.base[i3] = this.col[i3] = color.r; this.base[i3 + 1] = this.col[i3 + 1] = color.g; this.base[i3 + 2] = this.col[i3 + 2] = color.b;
    this.size[i * 2] = w; this.size[i * 2 + 1] = h;
    this.rotHome[i] = this.rot[i] = rot; this.alpha[i] = this.baseAlpha[i] = alpha;
    this.seed[i] = Math.random() * 100; this.phase[i] = Math.random() * Math.PI * 2;
  }
  flush(all = false) {
    this.aPos.needsUpdate = this.aCol.needsUpdate = this.aRot.needsUpdate = this.aAlp.needsUpdate = true;
    if (all) this.aSize.needsUpdate = this.aSeed.needsUpdate = true;
  }
}

// ── Backdrops ────────────────────────────────────────────────────
const skyFS = `
  varying vec3 vP; uniform vec3 uSun; uniform float uWarm;
  void main(){
    vec3 d = normalize(vP); float el = d.y;
    vec3 low = vec3(0.663,0.714,0.812), mid = vec3(0.541,0.612,0.741), high = vec3(0.478,0.549,0.714);
    vec3 sky = mix(low, mid, smoothstep(-0.05, 0.18, el)); sky = mix(sky, high, smoothstep(0.18, 0.7, el));
    vec3 sd = normalize(uSun);
    float az = max(0.0, dot(normalize(vec3(d.x,0.0,d.z)), normalize(vec3(sd.x,0.0,sd.z))));
    float warm = smoothstep(0.05, 0.45, el) * (0.35 + 0.65 * pow(az, 1.5)) * uWarm;
    sky = mix(sky, vec3(0.905,0.612,0.435), warm * 0.42);
    float g = pow(max(0.0, dot(d, sd)), 140.0);
    sky = mix(sky, vec3(0.95,0.60,0.42), g * 0.5);
    gl_FragColor = vec4(sky, 1.0);
  }`;
const skyVS = `varying vec3 vP; void main(){ vP = position; gl_Position = projectionMatrix*modelViewMatrix*vec4(position,1.0); }`;
const mkSky = (radius) => {
  const m = new THREE.Mesh(new THREE.SphereGeometry(radius, 48, 24, 0, Math.PI * 2, 0, Math.PI * 0.52),
    new THREE.ShaderMaterial({ side: THREE.BackSide, depthWrite: false, uniforms: { uSun: { value: sunPos }, uWarm: { value: 1.0 } }, vertexShader: skyVS, fragmentShader: skyFS }));
  m.renderOrder = -10; world.add(m); return m;
};
const skyDome = mkSky(150);     // immersive
const globeSky = mkSky(R);      // globe

const waterVS = `varying vec2 vL; void main(){ vL = position.xy; gl_Position = projectionMatrix*modelViewMatrix*vec4(position,1.0); }`;
const waterFS = `
  varying vec2 vL; uniform float uR;
  void main(){
    float far = clamp(vL.y / uR, 0.0, 1.0), back = clamp(-vL.y / uR, 0.0, 1.0);
    vec3 near = vec3(0.400,0.510,0.660), farc = vec3(0.620,0.690,0.800);
    vec3 c = mix(near, farc, pow(max(far, back * 0.7), 0.7));
    float col = exp(-abs(vL.x - 0.1 * vL.y) * 1.2) * far;
    c = mix(c, vec3(0.72,0.55,0.45), col * 0.18);
    gl_FragColor = vec4(c, 1.0);
  }`;
const mkWater = (geo, r) => {
  const m = new THREE.Mesh(geo, new THREE.ShaderMaterial({ depthWrite: false, uniforms: { uR: { value: r } }, vertexShader: waterVS, fragmentShader: waterFS }));
  m.rotation.x = -Math.PI / 2; m.position.y = WATER_Y - 0.01; m.renderOrder = -9; world.add(m); return m;
};
const bigWater = mkWater(new THREE.PlaneGeometry(400, 400), 60);
const waterDisc = mkWater(new THREE.CircleGeometry(R, 64), R);

// Glass dome + base (globe mode)
const glass = new THREE.Mesh(new THREE.SphereGeometry(R + 0.6, 64, 32, 0, Math.PI * 2, 0, Math.PI * 0.5), new THREE.ShaderMaterial({
  transparent: true, depthWrite: false, side: THREE.FrontSide,
  uniforms: { uGlow: { value: 0.0 } },
  vertexShader: `varying vec3 vN; varying vec3 vV; void main(){ vec4 mv = modelViewMatrix * vec4(position, 1.0); vN = normalize(normalMatrix * normal); vV = -mv.xyz; gl_Position = projectionMatrix * mv; }`,
  fragmentShader: `
    varying vec3 vN; varying vec3 vV; uniform float uGlow;
    void main(){
      float fr = pow(1.0 - max(0.0, dot(normalize(vN), normalize(vV))), 3.0);
      vec3 col = mix(vec3(0.85, 0.9, 1.0), vec3(1.0, 0.72, 0.5), uGlow);
      gl_FragColor = vec4(col, 0.05 + fr * (0.45 + uGlow * 0.4));
    }`
}));
glass.renderOrder = 12; world.add(glass);
const base = new THREE.Group(); world.add(base);
{
  const ring = new THREE.Mesh(new THREE.CylinderGeometry(R + 1.8, R + 2.6, 1.6, 64), new THREE.MeshBasicMaterial({ color: 0x1b2436 }));
  ring.position.y = -0.8 - 0.01; base.add(ring);
  const lip = new THREE.Mesh(new THREE.TorusGeometry(R + 1.2, 0.35, 8, 64), new THREE.MeshBasicMaterial({ color: 0xc9b58a }));
  lip.rotation.x = Math.PI / 2; lip.position.y = 0.05; base.add(lip);
}

// Cube backdrops: back wall gradient, box floor, frame edges
const backWall = new THREE.Mesh(new THREE.PlaneGeometry(BOX_HW * 2, BOX_H), new THREE.ShaderMaterial({
  depthWrite: false,
  uniforms: { uSun: { value: new THREE.Vector2(0, 10) }, uH: { value: BOX_H }, uWarm: { value: 1.0 } },
  vertexShader: `varying vec2 vL; void main(){ vL = position.xy; gl_Position = projectionMatrix*modelViewMatrix*vec4(position,1.0); }`,
  fragmentShader: `
    varying vec2 vL; uniform vec2 uSun; uniform float uH; uniform float uWarm;
    void main(){
      float y = (vL.y + uH * 0.5) / uH;
      vec3 low = vec3(0.663,0.714,0.812), mid = vec3(0.541,0.612,0.741), high = vec3(0.478,0.549,0.714);
      vec3 sky = mix(low, mid, smoothstep(0.0, 0.35, y)); sky = mix(sky, high, smoothstep(0.35, 1.0, y));
      float dx = (vL.x - uSun.x) / 40.0;
      float warm = smoothstep(0.25, 0.9, y) * (0.35 + 0.65 * exp(-dx * dx * 2.0)) * uWarm;
      sky = mix(sky, vec3(0.905,0.612,0.435), warm * 0.42);
      float g = exp(-length(vec2(vL.x - uSun.x, vL.y + uH * 0.5 - uSun.y)) * 0.12);
      sky = mix(sky, vec3(0.95,0.60,0.42), g * 0.5);
      gl_FragColor = vec4(sky, 1.0);
    }`
}));
backWall.position.set(0, BOX_H / 2, BOX_ZB); backWall.renderOrder = -10; world.add(backWall);
const boxFloor = mkWater(new THREE.PlaneGeometry(BOX_HW * 2, BOX_ZF - BOX_ZB), 30);
boxFloor.position.z = (BOX_ZF + BOX_ZB) / 2;
const frameMat = new THREE.LineBasicMaterial({ color: 0xfff1de, transparent: true, opacity: 0.35 });
const frame = new THREE.LineSegments(new THREE.EdgesGeometry(new THREE.BoxGeometry(BOX_HW * 2, BOX_H, BOX_ZF - BOX_ZB)), frameMat);
frame.position.set(0, BOX_H / 2, (BOX_ZF + BOX_ZB) / 2); world.add(frame);

// ── Sun ──────────────────────────────────────────────────────────
const sun = new THREE.Mesh(new THREE.CircleGeometry(1.3, 48), new THREE.MeshBasicMaterial({ color: PAL.sun, depthWrite: false, depthTest: false, side: THREE.DoubleSide }));
sun.renderOrder = 1.5; world.add(sun);
const sunHalo = new THREE.Mesh(new THREE.CircleGeometry(1.8, 48), new THREE.MeshBasicMaterial({ color: 0xff7a48, transparent: true, opacity: 0.16, depthWrite: false, depthTest: false, side: THREE.DoubleSide }));
sunHalo.renderOrder = 1.4; world.add(sunHalo);

// ── Layers ───────────────────────────────────────────────────────
const SKY_N = 4200;
const sky = new StrokeLayer(SKY_N, { renderOrder: 1, depthTest: false });
const SKY_CUBE_N = 2600;
function buildSky() {
  const Rs = R - 3.6;   // inset so the widest dabs stay inside the glass
  for (let i = 0; i < SKY_N; i++) {
    let x, y, z, el, az;
    if (MODE === 'cube') {
      // a slab of haze hugging the back wall, thinning toward the viewer
      if (i >= SKY_CUBE_N) { sky.set(i, 0, -50, 0, PAL.hazeBlue[0], 0.01, 0.01, 0, 0); continue; }
      x = (Math.random() - 0.5) * 2 * (BOX_HW - 1.5);
      y = 1.0 + Math.pow(Math.random(), 0.8) * (BOX_H - 1.5);
      z = BOX_ZB + 0.8 + Math.pow(Math.random(), 3.0) * 16;
      el = (y / BOX_H) * 1.2; az = x / BOX_HW * 0.9;
    } else {
      el = Math.pow(Math.random(), 0.8) * 1.3 + 0.02;
      az = Math.random() * Math.PI * 2 - Math.PI;
      x = Math.sin(az) * Math.cos(el) * Rs; y = Math.sin(el) * Rs; z = -Math.cos(az) * Math.cos(el) * Rs;
    }
    const azWarm = Math.max(0, Math.cos(az - SUN_AZ - 0.35));
    const warm = Math.min(1, Math.pow(el / 1.1, 1.5) * (0.25 + 0.75 * azWarm) * 1.05);
    let col; const r = Math.random();
    if (r < warm) col = pick(PAL.peach); else if (r < warm + 0.1) col = pick(PAL.hazeTeal); else col = pick(PAL.hazeBlue);
    col = jitter(col, 0.04);
    const w = Math.min(7.0, 3.0 + Math.random() * 5.0 + el * 1.5), h = 0.7 + Math.random() * 1.1;
    const rot = (Math.random() - 0.5) * 0.7 + (az > 0 ? -0.2 : 0.2);
    let clear;
    if (MODE === 'cube') clear = THREE.MathUtils.smoothstep(Math.hypot(x - sunPos.x, y - sunPos.y), 3.5, 8.0);
    else clear = THREE.MathUtils.smoothstep(Math.acos(THREE.MathUtils.clamp((x * sunPos.x + y * sunPos.y + z * sunPos.z) / (Rs * sunPos.length()), -1, 1)), 0.04, 0.11);
    const ws = MODE === 'cube' ? 0.55 : 1;
    const baseA = MODE === 'immersive' ? 0.30 + Math.random() * 0.25 : 0.24 + Math.random() * 0.2;
    sky.set(i, x, y, z, col, w * ws, h * ws, rot, baseA * (0.1 + 0.9 * clear));
  }
  sky.flush(true);
}

const WATER_N = 8200;
const water = new StrokeLayer(WATER_N, { renderOrder: 2 });
for (let i = 0; i < WATER_N; i++) {
  // sample the union of the disc and the cube's floor so either volume is fully painted
  let x, z, rr;
  do { x = (Math.random() - 0.5) * 2 * R; z = (Math.random() - 0.5) * 2 * R; rr = Math.hypot(x, z); }
  while (!(inDisc(x, z) || inBox(x, 1, z)) || rr < 0.6);
  const t = Math.min(1, rr / R);
  let col = pick(PAL.water);
  if (Math.random() < 0.08) col = pick(PAL.waterCream);
  const underSun = Math.exp(-Math.abs(x - (-z) * Math.tan(SUN_AZ)) * 0.25) * Math.max(0, -z / R);
  if (Math.random() < underSun * 0.35) col = col.clone().lerp(C(0xb08a78), 0.45);
  col = jitter(col, 0.05);
  const w = (0.35 + Math.random() * 0.9) * (1 + t * 3.0), h = (0.05 + Math.random() * 0.07) * (1 + t * 2.0);
  water.set(i, x, WATER_Y + 0.01 + Math.random() * 0.03, z, col, w, h, (Math.random() - 0.5) * 0.08, 0.75 + Math.random() * 0.25);
}
water.flush(true);

const REF_N = 520;
const refl = new StrokeLayer(REF_N, { renderOrder: 3 });
for (let i = 0; i < REF_N; i++) {
  const t = Math.pow(Math.random(), 0.9);
  const z = -1.2 - t * (R - 2.6);
  const spread = 0.35 + (1 - t) * 1.4;
  const x = (-z) * Math.tan(SUN_AZ) + (Math.random() - 0.5) * 2 * spread * (0.6 + 0.4 * Math.random());
  const dark = Math.random() < 0.42;
  const col = jitter(dark ? pick(PAL.reflectDark) : pick(PAL.reflect), 0.08);
  const w = (0.22 + Math.random() * 0.5) * (1 + t * 3.2), h = (0.035 + Math.random() * 0.05) * (1 + t * 2.2);
  refl.set(i, x, WATER_Y + 0.03 + Math.random() * 0.03, z, col, w, h, (Math.random() - 0.5) * 0.06, dark ? 0.85 : 0.95);
}
refl.flush(true);

const SIL_N = 700;
const sil = new StrokeLayer(SIL_N, { renderOrder: 4 });
function buildSil() {
  let i = 0;
  const dab = (x, y, z, w, h, rot, a = 0.95, col = pick(PAL.ink)) => { if (i < SIL_N) sil.set(i++, x, y, z, jitter(col, 0.04), w, h, rot, a); };
  // the boats themselves are meshes now (see SHIPS below); the dabs keep their
  // broken reflection on the water
  const boat = (bx, bz, s, figure) => {
    for (let k = 0; k < 7; k++) dab(bx + (Math.random() - 0.5) * 0.7 * s, WATER_Y + 0.02, bz + 0.2 + k * 0.28 * s, 0.32 * s, 0.05, 0, 0.55, pick(PAL.reflectDark));
  };
  boat(-0.9, -6.5, 1.0, true); boat(-3.6, -14, 0.9, true); boat(-6.0, -22, 0.8, false);
  // masts & hulls along the far rim: a big cluster to the left, a smaller one to the right
  // globe/immersive: along the far rim of the disc. cube: along the back wall.
  const ringDab = MODE === 'cube'
    ? (az, rr, y, w, h, rot, a, col) => dab(THREE.MathUtils.clamp(Math.sin(az) * rr * 0.9, -BOX_HW + 1, BOX_HW - 1), y, BOX_ZB + 2 + (R - rr), w, h, rot, a, col)
    : (az, rr, y, w, h, rot, a, col) => dab(Math.sin(az) * rr, y, -Math.cos(az) * rr, w, h, rot, a, col);
  for (let k = 0; k < 26; k++) {
    const az = Math.random() < 0.7 ? -1.35 + Math.random() * 0.75 : 0.45 + Math.random() * 0.5;
    const rr = R - 3 - Math.random() * 5, hgt = 2.5 + Math.random() * 6, col = pick(PAL.mast);
    ringDab(az, rr, hgt * 0.5, 0.12 + Math.random() * 0.12, hgt, (Math.random() - 0.5) * 0.05, 0.42, col);
    if (Math.random() < 0.45) ringDab(az, rr, hgt * (0.55 + Math.random() * 0.3), 1.0 + Math.random() * 2.0, 0.10, (Math.random() - 0.5) * 0.1, 0.38, col);
    ringDab(az + (Math.random() - 0.5) * 0.05, rr, 0.6, 3 + Math.random() * 4, 1.0 + Math.random() * 0.6, 0, 0.30, col);
  }
  for (let k = 0; k < 6; k++) {
    const az = 0.5 + Math.random() * 0.4, rr = R - 3 - Math.random() * 4, col = pick(PAL.mast);
    ringDab(az, rr, 2.8, 0.16, 5.5, 0, 0.40, col); ringDab(az + 0.03, rr, 4.6, 3.2, 0.12, 0.55, 0.36, col);
  }
  for (let k = 0; k < 60; k++) ringDab(-1.15 + Math.random() * 0.4, R - 5, 5 + Math.random() * 10, 1.5 + Math.random() * 2.5, 0.6 + Math.random() * 0.6, (Math.random() - 0.5) * 0.6, 0.35, pick([C(0x8d9bb8), C(0x9daac4), C(0xb2b4c4)]));
  for (; i < SIL_N; i++) sil.set(i, 0, -50, 0, PAL.ink[0], 0.01, 0.01, 0, 0);
  sil.flush(true);
}
buildSil();

// ── the rowing boats ────────────────────────────────────────────────────────
// one outline each — hull, rower, passenger — the way Monet leaves them: a dark
// shape on the water with no detail at all
function boatShape() {
  const p = new THREE.Shape();
  p.moveTo(-1.35, 0.20);
  p.quadraticCurveTo(0, -0.34, 1.35, 0.20);
  p.quadraticCurveTo(1.30, 0.30, 1.10, 0.31);
  p.lineTo(0.86, 0.31);
  p.quadraticCurveTo(0.80, 0.52, 0.74, 0.62);
  p.quadraticCurveTo(0.66, 0.80, 0.58, 0.62);
  p.quadraticCurveTo(0.54, 0.48, 0.52, 0.31);
  p.lineTo(-0.16, 0.31);
  p.quadraticCurveTo(-0.26, 0.70, -0.34, 0.90);
  p.quadraticCurveTo(-0.44, 1.12, -0.54, 0.90);
  p.quadraticCurveTo(-0.58, 0.60, -0.60, 0.31);
  p.lineTo(-1.15, 0.31);
  p.quadraticCurveTo(-1.32, 0.30, -1.35, 0.20);
  return p;
}
const boatGeo = new THREE.ShapeGeometry(boatShape(), 24);
const oarGeo = new THREE.PlaneGeometry(2.2, 0.055);
const SHIPS = [];
[[-0.9, -6.5, 0.8, 0x18202a], [-3.6, -14, 0.72, 0x222c38], [-6.0, -22, 0.62, 0x35404e]].forEach(([bx, bz, s, ink]) => {
  const g = new THREE.Group();
  const mat = new THREE.MeshBasicMaterial({ color: ink, side: THREE.DoubleSide, fog: false });
  g.add(new THREE.Mesh(boatGeo, mat));
  const oar = new THREE.Mesh(oarGeo, mat); oar.position.set(-0.2, 0.5, 0.01); oar.rotation.z = -0.2; g.add(oar);
  g.position.set(bx, WATER_Y + 0.02, bz); g.scale.setScalar(s);
  g.userData.bob = Math.random() * 6.28; g.userData.home = g.position.clone();
  g.userData.noCollider = true;
  world.add(g); SHIPS.push(g);
});

const MIST_N = 420;
const mist = new StrokeLayer(MIST_N, { renderOrder: 5, blending: THREE.AdditiveBlending, depthTest: false });
for (let i = 0; i < MIST_N; i++) {
  const rr = Math.sqrt(Math.random()) * 14, a = Math.random() * Math.PI * 2;
  const x = Math.sin(a) * rr, z = -Math.cos(a) * rr, y = 0.2 + Math.random() * 3.2;
  const col = Math.random() < 0.25 ? C(0x5a3a2a) : C(0x2a3550);
  const s = 0.05 + Math.random() * 0.12;
  mist.set(i, x, y, z, col, s * (1.5 + Math.random()), s, Math.random() * 3.14, 0.10 + Math.random() * 0.08);
}
mist.flush(true);
// ── Time & interaction state ─────────────────────────────────────
let simT = 0, timeScale = 1, energy = 0;

// ── Physics helpers ──────────────────────────────────────────────
function springBack(L, i, k, damp, dt) {
  const i3 = i * 3;
  L.vel[i3] += (L.home[i3] - L.pos[i3]) * k * dt;
  L.vel[i3 + 1] += (L.home[i3 + 1] - L.pos[i3 + 1]) * k * dt;
  L.vel[i3 + 2] += (L.home[i3 + 2] - L.pos[i3 + 2]) * k * dt;
  L.vel[i3] *= damp; L.vel[i3 + 1] *= damp; L.vel[i3 + 2] *= damp;
  L.pos[i3] += L.vel[i3] * dt; L.pos[i3 + 1] += L.vel[i3 + 1] * dt; L.pos[i3 + 2] += L.vel[i3 + 2] * dt;
}
function handForce(L, i, p, v, radius, strength, smear, dt) {
  const i3 = i * 3;
  const dx = L.pos[i3] - p.x, dy = L.pos[i3 + 1] - p.y, dz = L.pos[i3 + 2] - p.z;
  const d2 = dx * dx + dy * dy + dz * dz;
  if (d2 > radius * radius || d2 < 1e-6) return 0;
  const d = Math.sqrt(d2), f = 1 - d / radius, s = f * strength * dt;
  L.vel[i3] += (dx / d) * s + v.x * smear * f * dt;
  L.vel[i3 + 1] += (dy / d) * s + v.y * smear * f * dt;
  L.vel[i3 + 2] += (dz / d) * s + v.z * smear * f * dt;
  return f;
}
function vortex(L, i, p, radius, strength, lift, dt) {
  const i3 = i * 3;
  const dx = L.pos[i3] - p.x, dz = L.pos[i3 + 2] - p.z, dy = L.pos[i3 + 1] - p.y;
  const d2 = dx * dx + dz * dz + dy * dy * 0.35;
  if (d2 > radius * radius || d2 < 1e-6) return 0;
  const d = Math.sqrt(d2), f = Math.sin((1 - d / radius) * Math.PI);
  const s = f * strength * dt;
  L.vel[i3] += (-dz / d) * s - (dx / d) * s * 0.35;
  L.vel[i3 + 2] += (dx / d) * s - (dz / d) * s * 0.35;
  L.vel[i3 + 1] += lift * f * dt;
  return f;
}
// pinch effect dispatcher: whirl / gather / scatter
function pinchForce(L, i, h, radius, strength, lift, dt) {
  if (FX.pinch === 'whirl') return vortex(L, i, h.localPinch, radius, strength, lift, dt);
  if (FX.pinch === 'gather') return handForce(L, i, h.localPinch, h.localVel, radius * 1.3, -strength * 0.9, 0.6, dt);
  return handForce(L, i, h.localPinch, h.localVel, radius * 1.2, strength * 1.1, 0.3, dt);
}

// ── Globe grab / scale / rotate ──────────────────────────────────
const _v = new THREE.Vector3(), _v2 = new THREE.Vector3();
let twoHand = null;

function classifyHand(h) {
  h.local.copy(h.pos); world.worldToLocal(h.local);
  h.localPinch.copy(h.pinchPt); world.worldToLocal(h.localPinch);
  _v.copy(h.prev); world.worldToLocal(_v);
  h.localVel.copy(h.local).sub(_v);
  if (!isWidget()) { h.inside = true; h.nearGlass = false; return; }
  const l = h.localPinch;
  if (MODE === 'cube') {
    h.inside = inBox(l.x, l.y, l.z);
    const ddx = Math.max(Math.abs(l.x) - BOX_HW, 0), ddy = Math.max(-l.y, l.y - BOX_H, 0), ddz = Math.max(BOX_ZB - l.z, l.z - BOX_ZF, 0);
    const outside = Math.hypot(ddx, ddy, ddz) / U();
    const insideEdge = Math.min(BOX_HW - Math.abs(l.x), Math.min(l.y, BOX_H - l.y), Math.min(BOX_ZF - l.z, l.z - BOX_ZB)) / U();
    h.nearGlass = (!h.inside && outside < 0.07) || (h.inside && insideEdge < 0.03);
    return;
  }
  const r = l.length();
  h.inside = r < R - 0.5 && l.y > -0.5;
  h.nearGlass = Math.abs(r - R) / U() < 0.07 && l.y > -3;
}
let handleHot = false;      // the framework's handle is hovered or held
function updateGrabs() {
  if (!isWidget()) return;
  const near = handleHot;
  glass.material.uniforms.uGlow.value += ((near ? 1 : 0) - glass.material.uniforms.uGlow.value) * 0.2;
  frameMat.opacity += ((near ? 0.9 : 0.35) - frameMat.opacity) * 0.2;
  frameMat.color.lerp(near ? C(0xffb080) : C(0xfff1de), 0.2);
  applyMode_pose();
  return;
  /* the original hand-grab, replaced by the framework's own drag / two-hand scale

  const L = hands.left, Rh = hands.right;
  for (const h of [L, Rh]) {
    if (!h.active) { h.grabbing = false; continue; }
    const pinchStart = h.pinch > 0.7 && h.prevPinch <= 0.7;
    if (pinchStart && h.nearGlass && !h.palmUp) { h.grabbing = true; h.grabOffset.copy(globePose.pos).sub(h.pinchPt); }
    if (h.pinch < 0.4) h.grabbing = false;
  }
  if (L.grabbing && Rh.grabbing) {
    const d = L.pinchPt.distanceTo(Rh.pinchPt);
    const yaw = Math.atan2(Rh.pinchPt.x - L.pinchPt.x, Rh.pinchPt.z - L.pinchPt.z);
    const mid = _v.copy(L.pinchPt).add(Rh.pinchPt).multiplyScalar(0.5);
    if (!twoHand) twoHand = { dist: d, yaw, scale0: globePose.scale, yaw0: globePose.yaw, off: globePose.pos.clone().sub(mid) };
    globePose.scale = THREE.MathUtils.clamp(twoHand.scale0 * d / twoHand.dist, 0.4, 3.0);
    globePose.yaw = twoHand.yaw0 + (yaw - twoHand.yaw);
    globePose.pos.copy(mid).add(twoHand.off);
  } else {
    twoHand = null;
    const g = L.grabbing ? L : Rh.grabbing ? Rh : null;
    if (g) globePose.pos.copy(g.pinchPt).add(g.grabOffset);
  }
  world.scale.setScalar(GLOBE_SCALE * globePose.scale);
  world.position.copy(globePose.pos);
  world.rotation.set(0, globePose.yaw, 0);
  world.updateMatrixWorld(true);
  */
}
// the widget's pose, written by whoever is carrying it
function applyMode_pose() {
  world.scale.setScalar(GLOBE_SCALE * globePose.scale);
  world.position.copy(globePose.pos);
  world.rotation.set(0, globePose.yaw, 0);
  world.updateMatrixWorld(true);
}

// ── Per-frame update ─────────────────────────────────────────────
function update(realDt, now) {
  const dt = Math.min(realDt, 0.04);
  const u = U();
  const active = ['left', 'right'].map(s => hands[s]).filter(h => h.active);
  for (const h of active) { classifyHand(h); h.localVel.divideScalar(Math.max(dt, 1e-3)); }
  updateGrabs();

  // hands that act on the paint: not grabbing, not hosting the menu, not poking it
  const paintHands = active.filter(h => !h.grabbing && !h.palmUp && (MODE === 'immersive' || h.inside));
  const stirring = paintHands.filter(h => h.pinch > 0.6);

  let targetScale = 1;
  if (FX.accelerate) for (const h of stirring) targetScale = Math.max(targetScale, 1 + 6 * THREE.MathUtils.smoothstep(h.pinch, 0.6, 1.0));
  timeScale += (targetScale - timeScale) * Math.min(1, dt * (targetScale > timeScale ? 4 : 1.2));
  energy += (((timeScale - 1) / 6) - energy) * Math.min(1, dt * 2);
  simT += dt * timeScale;
  const t = simT, amp = 1 + energy * 2.2;

  sunElev += (sunElevTarget - sunElev) * Math.min(1, dt * 1.5);
  placeSun();
  const warm = 0.7 + (sunElev - 0.06) * 1.4 + energy * 0.35;
  skyDome.material.uniforms.uWarm.value = warm;
  globeSky.material.uniforms.uWarm.value = warm;

  const rSweep = isWidget() ? 0.11 * u : 0.9;
  const rStir = isWidget() ? 0.16 * u : 1.4;
  const kF = isWidget() ? u * 0.08 : 1;
  backWall.material.uniforms.uWarm.value = warm;

  // ── Sky haze ──
  for (let i = 0; i < SKY_N; i++) {
    if (sky.baseAlpha[i] === 0) continue;
    const i3 = i * 3, ph = sky.phase[i];
    sky.rot[i] = sky.rotHome[i] + Math.sin(t * 0.15 + ph) * 0.05 * amp;
    sky.home[i3] += Math.sin(t * 0.05 + ph) * 0.0015 * amp;
    if (isWidget()) {
      for (const h of paintHands) {
        if (h.pinch > 0.6) pinchForce(sky, i, h, rStir * 1.3, 9 * kF, 0.4 * kF, dt);
        else handForce(sky, i, h.local, h.localVel, rSweep * 1.6, 0, 1.6, dt);
      }
    }
    springBack(sky, i, 2.5, 0.96, dt);
  }
  if (MODE === 'immersive') {
    for (const h of paintHands) {
      if (h.pinch > 0.6 || h.vel.lengthSq() < 0.05) continue;
      const dir = _v.copy(h.pos).sub(CAM.position).normalize();
      if (dir.y < 0.05) continue;
      for (let i = 0; i < SKY_N; i++) {
        const i3 = i * 3, sx = sky.home[i3], sy = sky.home[i3 + 1], sz = sky.home[i3 + 2];
        const dot = (sx * dir.x + sy * dir.y + sz * dir.z) / Math.sqrt(sx * sx + sy * sy + sz * sz);
        if (dot < 0.985) continue;
        const f = (dot - 0.985) / 0.015, sc = 36 * f * dt * 1.4;
        sky.vel[i3] += h.vel.x * sc; sky.vel[i3 + 1] += h.vel.y * sc; sky.vel[i3 + 2] += h.vel.z * sc;
        sky.rot[i] += h.vel.y * 0.15 * f;
      }
    }
  }
  sky.flush();

  // ── Water dashes ──
  for (let i = 0; i < WATER_N; i++) {
    if (water.regionMask[i] === 0) continue;
    const i3 = i * 3, ph = water.phase[i];
    water.home[i3 + 1] = WATER_Y + 0.02 + Math.sin(t * 0.9 + ph + water.home[i3] * 0.3) * 0.012 * amp;
    water.home[i3] += Math.sin(t * 0.2 + ph) * 0.0008 * amp;
    water.rot[i] = water.rotHome[i] + Math.sin(t * 0.7 + ph) * 0.02 * amp;
    for (const h of paintHands) {
      if (h.pinch > 0.6) {
        const f = pinchForce(water, i, h, rStir, 14 * kF * h.pinch, 1.2 * kF, dt);
        if (f > 0) {
          water.rot[i] += f * 0.6 * dt * timeScale;
          water.col[i3] = Math.min(1, water.col[i3] + f * 0.05); water.col[i3 + 1] = Math.min(1, water.col[i3 + 1] + f * 0.03);
        }
      } else {
        if (MODE === 'immersive' && h.pos.y > 0.9) continue;
        const f = handForce(water, i, h.local, h.localVel, rSweep, 2.6 * kF, 1.8, dt);
        if (f > 0) {
          water.vel[i3 + 1] += f * 0.9 * kF * dt;
          water.rot[i] += (Math.random() - 0.5) * f * 0.25;
          water.col[i3] = Math.min(1, water.col[i3] + f * 0.06); water.col[i3 + 1] = Math.min(1, water.col[i3 + 1] + f * 0.04);
        }
      }
    }
    springBack(water, i, 6.0, 0.93, dt);
    if (water.pos[i3 + 1] < WATER_Y) { water.pos[i3 + 1] = WATER_Y; water.vel[i3 + 1] *= -0.3; }
    const lift = energy * 0.10;
    water.col[i3] += (water.base[i3] + lift - water.col[i3]) * 0.03;
    water.col[i3 + 1] += (water.base[i3 + 1] + lift * 0.7 - water.col[i3 + 1]) * 0.03;
    water.col[i3 + 2] += (water.base[i3 + 2] - water.col[i3 + 2]) * 0.03;
  }
  water.flush();

  // ── Reflection column ──
  for (let i = 0; i < REF_N; i++) {
    if (refl.regionMask[i] === 0) continue;
    const i3 = i * 3, ph = refl.phase[i], z = refl.home[i3 + 2];
    const centerX = (-z) * Math.tan(SUN_AZ) + Math.sin(t * 1.3 + ph + z * 0.4) * 0.12 * amp;
    refl.home[i3] += (centerX + (refl.seed[i] % 1 - 0.5) * 2.0 * (0.35 + (1 - z / -R) * 1.4) - refl.home[i3]) * 0.02;
    refl.home[i3 + 1] = WATER_Y + 0.035 + Math.sin(t * 1.1 + ph) * 0.012 * amp;
    refl.alpha[i] = Math.min(1, refl.baseAlpha[i] * (0.9 + (sunElev - 0.06) * 0.6 + energy * 0.15));
    for (const h of paintHands) {
      if (h.pinch > 0.6) {
        const f = pinchForce(refl, i, h, rStir * 1.15, 16 * kF * h.pinch, 3.0 * kF, dt);
        if (f > 0) { refl.col[i3] = Math.min(1, refl.col[i3] + f * 0.06); refl.col[i3 + 1] = Math.min(1, refl.col[i3 + 1] + f * 0.04); }
      } else {
        if (MODE === 'immersive' && h.pos.y > 1.1) continue;
        handForce(refl, i, h.local, h.localVel, rSweep * 0.8, 2.0 * kF, 1.5, dt);
      }
    }
    springBack(refl, i, 5.0, 0.92, dt);
    if (refl.pos[i3 + 1] < WATER_Y + 0.01) { refl.pos[i3 + 1] = WATER_Y + 0.01; refl.vel[i3 + 1] *= -0.2; }
    refl.col[i3] += (refl.base[i3] - refl.col[i3]) * 0.03;
    refl.col[i3 + 1] += (refl.base[i3 + 1] - refl.col[i3 + 1]) * 0.03;
    refl.col[i3 + 2] += (refl.base[i3 + 2] - refl.col[i3 + 2]) * 0.03;
  }
  refl.flush();

  // ── Silhouettes ──
  for (let i = 0; i < SIL_N; i++) {
    const i3 = i * 3;
    if (sil.alpha[i] === 0) continue;
    const near = Math.hypot(sil.home[i3], sil.home[i3 + 2]) < 30;
    sil.pos[i3 + 1] = sil.home[i3 + 1] + (near ? Math.sin(t * 0.8 + sil.home[i3 + 2] * 0.5) * 0.02 * amp : 0);
    sil.rot[i] = sil.rotHome[i] + (near ? Math.sin(t * 0.8 + sil.home[i3 + 2] * 0.5 + 1) * 0.03 * amp : 0);
  }
  sil.flush();

  // ── the boats ride the swell ──
  for (const b of SHIPS) {
    const ph = b.userData.bob, hm = b.userData.home;
    b.position.y = hm.y + Math.sin(t * 0.9 + ph) * 0.05 * amp;
    b.position.x = hm.x + Math.sin(t * 0.35 + ph) * 0.05 * amp;
    b.rotation.z = Math.sin(t * 0.7 + ph) * 0.02 * amp;
  }

  // ── Mist motes ──
  if (FX.mist) {
    for (let i = 0; i < MIST_N; i++) {
      if (mist.regionMask[i] === 0) continue;
      const i3 = i * 3, ph = mist.phase[i];
      mist.home[i3] += Math.sin(t * 0.3 + ph) * 0.002 * amp;
      mist.home[i3 + 1] += Math.cos(t * 0.23 + ph) * 0.0015 * amp;
      mist.rot[i] += 0.002 * timeScale;
      for (const h of paintHands) {
        if (h.pinch > 0.6) pinchForce(mist, i, h, rStir * 1.2, 10 * kF, 2.0 * kF, dt);
        else handForce(mist, i, h.local, h.localVel, rSweep, 2.2 * kF, 1.2, dt);
      }
      springBack(mist, i, 1.2, 0.95, dt);
      mist.alpha[i] = 0.12 + Math.sin(t * 0.8 + ph) * 0.05 + energy * 0.08;
    }
    mist.flush();
  }

  for (const s of ['left', 'right']) {
    const h = hands[s], d = pinchDots[s];
    d.visible = h.active && !h.grabbing && !h.palmUp;
    if (d.visible) { d.position.copy(h.pinchPt); d.scale.setScalar(0.35 + h.pinch * 1.0 + energy * 0.6); d.material.opacity = 0.35 + h.pinch * 0.6; }
    h.prevPinch = h.pinch; h.wasActive = h.active;
  }
}

  // ── hands, read from the framework's input sources ──────────────────────
  const mkHand = (side) => ({
    side,
    pos: new THREE.Vector3(), prev: new THREE.Vector3(), vel: new THREE.Vector3(),
    pinchPt: new THREE.Vector3(), indexTip: new THREE.Vector3(), palmN: new THREE.Vector3(0, 1, 0),
    local: new THREE.Vector3(), localVel: new THREE.Vector3(), localPinch: new THREE.Vector3(),
    pinch: 0, prevPinch: 0, active: false, wasActive: false,
    grabbing: false, nearGlass: false, inside: false, palmUp: false,
    grabOffset: new THREE.Vector3()
  });
  const hands = { left: mkHand("left"), right: mkHand("right") };
  const _rp = new THREE.Vector3(), _rl = new THREE.Vector3();
  // is this point in the paint already? (the widget's volume, or the sea in front of you)
  function withinPaint(p) {
    if (isWidget()) return p.distanceTo(globePose.pos) < R * GLOBE_SCALE * globePose.scale * 1.05;
    return p.y < 1.9;
  }
  // where a ray lands in the painting: the water sheet when you are inside it,
  // the heart of the widget when you are holding it at arm's length
  function rayTarget(src) {
    const o = src.ray.origin, d = src.ray.dir;
    if (isWidget()) {
      _rl.copy(globePose.pos).sub(o);
      const t = _rl.dot(d);
      if (t < 0.05) return null;
      const rad = R * GLOBE_SCALE * globePose.scale;
      _rp.copy(o).addScaledVector(d, t);                    // closest approach: inside the glass
      if (_rp.distanceTo(globePose.pos) > rad) return null;
      return _rp;
    }
    if (d.y > -0.02) return null;
    const t = -(o.y - WATER_Y) / d.y;
    if (t < 0.2 || t > R * 1.5) return null;
    return _rp.copy(o).addScaledVector(d, t);
  }
  // a hand, a controller or the mouse — all of them can stir paint and carry the globe
  function readHands(dt) {
    for (const s of ["left", "right"]) { hands[s].prev.copy(hands[s].pos); hands[s].active = false; }
    for (const g of app.im.groups.values()) {
      const src = g.source;
      const h = hands[src.handedness === "left" ? "left" : "right"];
      if (h.active) continue;
      if (g.list.some((i) => i.selecting)) continue;        // the framework is carrying something with it
      let p = null, pinch = 0, tip = null, palm = null, palmUp = false;
      if (src.kind === "hand" && src.tracked) {
        p = src.pinchPoint; tip = src.pokePoint; palm = src.palmNormal; pinch = src.pinchValue; palmUp = src.palmFacingHead;
        h.pos.copy(src.palmCenter);
      } else if (src.kind === "controller" && src.tracked) {
        p = src.nearPoint; tip = src.pokePoint; pinch = Math.max(src.selectValue || 0, src.select ? 1 : 0);
        h.pos.copy(src.nearPoint);
      } else if (src.ray.valid) {
        pinch = src.select ? 1 : 0;
      }
      // out of arm's reach? then the ray carries the hand to where it lands
      if (!p || (pinch > 0.05 && !withinPaint(p))) {
        const hit = src.ray.valid && pinch > 0.05 ? rayTarget(src) : null;
        if (hit) { p = hit; tip = hit; h.pos.copy(hit); }
        else if (!p) continue;
      }
      h.active = true;
      h.pinchPt.copy(p);
      h.indexTip.copy(tip || p);
      if (palm) h.palmN.copy(palm).negate(); else h.palmN.set(0, 1, 0);
      h.pinch = pinch; h.palmUp = palmUp;
      if (!h.wasActive) h.prev.copy(h.pos);
      h.vel.copy(h.pos).sub(h.prev).divideScalar(Math.max(dt, 1e-3));
    }
  }

  function recentreGlobe() {
    const fwd = new THREE.Vector3(0, 0, -1).applyQuaternion(CAM.quaternion); fwd.y = 0; fwd.normalize();
    globePose.pos.copy(CAM.position).add(fwd.multiplyScalar(0.6)); globePose.pos.y = CAM.position.y - 0.45;
    globePose.yaw = Math.atan2(fwd.x, fwd.z) + Math.PI; globePose.scale = 1;
    if (isWidget()) applyMode();
  }
  function setMode(m) { MODE = m; if (isWidget()) recentreGlobe(); applyMode(); }
  function setPinch(v) { FX.pinch = v; onModeChanged(); }
  function toggleFX(k) {
    FX[k] = !FX[k];
    if (k === "sunUp") sunElevTarget = FX.sunUp ? 0.42 : 0.155;
    if (k === "mist") { mist.mesh.visible = FX.mist; }
    onModeChanged();
  }
  // the pinch dots the original draws at each pinch point
  const pinchDots = {};
  for (const s of ["left", "right"]) {
    const d = new THREE.Mesh(new THREE.SphereGeometry(0.008, 12, 10), new THREE.MeshBasicMaterial({ color: 0xff4d1c, transparent: true, opacity: 0.9 }));
    d.renderOrder = 9; d.visible = false; d.userData.noCollider = true; root.add(d); pinchDots[s] = d;
  }

  applyMode();
  recentreGlobe();
  return {
    world, hands, update(dt, now) { readHands(dt); update(dt, now); },
    setMode, setPinch, toggleFX, recentreGlobe, applyMode,
    get mode() { return MODE; }, FX,
    onMode(fn) { onModeChanged = fn; },
    isWidget, glass, ships: SHIPS, globePose, R, GLOBE_SCALE,
    setHandleHot(v) { handleHot = v; },
    setPose(pos, scale, yaw) { globePose.pos.copy(pos); globePose.scale = scale; globePose.yaw = yaw; },
    N: SKY_N + WATER_N + REF_N + SIL_N + MIST_N
  };
}

// ============================================================================
// src/art/qianli-jiangshan.js — "A Thousand Li of Rivers and Mountains"
// (千里江山圖, after Wang Ximeng, 1113 — public domain), an original reading of
// the handscroll: malachite and azurite ranges built from brush strokes, silk
// sky, a river of pale jade, and the mist you can sweep with your hand.
// Three ways to hold it: Immersive (you stand on the shore), Globe (a bowl in
// your hands) and Scroll (the ranges unrolled into a band in front of you).
// ============================================================================
function buildQianli(THREE, root, app) {
  const CAM = app.camera;
  const world = new THREE.Group();
  root.add(world);
  let MODE = "scroll";
  let onModeChanged = () => {};

  const C = (h) => new THREE.Color(h);
  const PAL = {
    malachite: [C(0x2f6b4f), C(0x3c8361), C(0x54a075), C(0x1f5140)],
    azurite: [C(0x24597a), C(0x2e6e92), C(0x3f86a6), C(0x1b4460)],
    silk: [C(0xd9c79c), C(0xcbb587), C(0xe3d4ad)],
    ink: [C(0x2a2620), C(0x3a3428)],
    gold: [C(0xe6cf92), C(0xd8b56a)],
    water: [C(0x8fb0ae), C(0xa7c4bd), C(0x77999b), C(0xbcd2c8)],
    mist: [C(0xeef0e6), C(0xdfe4d8)]
  };
  let seed=73021;
  const random=()=>((seed=(1664525*seed+1013904223)>>>0)/4294967296);
  const pick = (a) => a[(random() * a.length) | 0];
  const rnd = (a, b) => a + random() * (b - a);

  const R = 230;                      // painting units: the ranges stand 30-210 out
  const GLOBE_SCALE = 0.8 / (R * 2);
  const SCROLL_SCALE = 1.7 / 430;            // the band reads about 1.7 m wide
  const SCROLL_STRETCH = 2.0;                // and stands up, the way a scroll is read
  const SCROLL_BOX_HW = 215, SCROLL_BOX_H = 70, SCROLL_BOX_ZF = -25, SCROLL_BOX_ZB = -160;
  const globePose = { pos: new THREE.Vector3(0, 1.05, -0.6), yaw: 0, scale: 1 };
  const isWidget = () => MODE !== "immersive";

  // ── a brush-stroke layer: instanced quads that always face you ───────────
  const vs = `
    attribute vec3 iPos; attribute vec3 iCol; attribute vec2 iSize;
    attribute float iRot; attribute float iAlpha;
    varying vec2 vUv; varying vec3 vCol; varying float vAlpha;
    void main() {
      vUv = position.xy; vCol = iCol; vAlpha = iAlpha;
      vec4 c = modelViewMatrix * vec4(iPos, 1.0);
      float s = length(modelMatrix[0].xyz);
      float cs = cos(iRot), sn = sin(iRot);
      vec2 off = vec2(position.x * iSize.x, position.y * iSize.y) * s;
      c.xy += vec2(off.x * cs - off.y * sn, off.x * sn + off.y * cs);
      gl_Position = projectionMatrix * c;
    }`;
  const fs = `
    precision highp float;
    varying vec2 vUv; varying vec3 vCol; varying float vAlpha;
    void main() {
      vec2 q = vUv * 2.0;
      float d = dot(q, q);
      float grain=fract(sin(dot(floor(vUv*vec2(75.,13.)),vec2(12.9898,78.233)))*43758.5453);
      float a = (1.0 - smoothstep(0.38, 1.0, d)) * (.78+.22*grain);
      if (a * vAlpha < 0.01) discard;
      gl_FragColor = vec4(vCol, a * vAlpha);
    }`;
  function layer(count, { renderOrder = 0, depthWrite = false, depthTest = true } = {}) {
    const L = {
      n: count,
      home: new Float32Array(count * 3), pos: new Float32Array(count * 3), vel: new Float32Array(count * 3),
      col: new Float32Array(count * 3), size: new Float32Array(count * 2),
      rot: new Float32Array(count), alpha: new Float32Array(count), baseAlpha: new Float32Array(count),
      phase: new Float32Array(count)
    };
    const g = new THREE.InstancedBufferGeometry();
    const quad = new THREE.PlaneGeometry(1, 1);
    g.index = quad.index; g.setAttribute("position", quad.getAttribute("position"));
    const A = (arr, n) => new THREE.InstancedBufferAttribute(arr, n).setUsage(THREE.DynamicDrawUsage);
    L.aPos = A(L.pos, 3); L.aCol = A(L.col, 3); L.aSize = A(L.size, 2); L.aRot = A(L.rot, 1); L.aAlpha = A(L.alpha, 1);
    g.setAttribute("iPos", L.aPos); g.setAttribute("iCol", L.aCol); g.setAttribute("iSize", L.aSize);
    g.setAttribute("iRot", L.aRot); g.setAttribute("iAlpha", L.aAlpha);
    g.instanceCount = count;
    L.mesh = new THREE.Mesh(g, new THREE.ShaderMaterial({
      vertexShader: vs, fragmentShader: fs, transparent: true, depthWrite, depthTest, side: THREE.DoubleSide
    }));
    L.mesh.frustumCulled = false; L.mesh.renderOrder = renderOrder; L.mesh.userData.noCollider = true;
    world.add(L.mesh);
    L.set = (i, x, y, z, color, w, h, rot, alpha) => {
      const i3 = i * 3;
      L.home[i3] = L.pos[i3] = x; L.home[i3 + 1] = L.pos[i3 + 1] = y; L.home[i3 + 2] = L.pos[i3 + 2] = z;
      L.vel[i3] = L.vel[i3 + 1] = L.vel[i3 + 2] = 0;
      L.col[i3] = color.r; L.col[i3 + 1] = color.g; L.col[i3 + 2] = color.b;
      L.size[i * 2] = w; L.size[i * 2 + 1] = h;
      L.rot[i] = rot; L.alpha[i] = L.baseAlpha[i] = alpha;
      L.phase[i] = random() * 6.283;
    };
    L.flush = (all) => {
      L.aPos.needsUpdate = L.aCol.needsUpdate = L.aRot.needsUpdate = L.aAlpha.needsUpdate = true;
      if (all) L.aSize.needsUpdate = true;
    };
    return L;
  }

  // ── the silk sky and the river ──────────────────────────────────────────
  const skyMat = new THREE.ShaderMaterial({
    side: THREE.BackSide, depthWrite: false, fog: false,
    uniforms: { uAlpha: { value: 1 } },
    vertexShader: `varying vec3 vP; void main(){ vP = position; gl_Position = projectionMatrix*modelViewMatrix*vec4(position,1.0); }`,
    fragmentShader: `
      precision highp float;
      uniform float uAlpha; varying vec3 vP;
      void main(){
        vec3 d = normalize(vP);
        vec3 low = vec3(0.855, 0.788, 0.627);        // aged silk at the horizon
        vec3 mid = vec3(0.780, 0.745, 0.627);
        vec3 high = vec3(0.671, 0.678, 0.596);
        vec3 c = mix(low, mid, smoothstep(-0.02, 0.25, d.y));
        c = mix(c, high, smoothstep(0.25, 0.85, d.y));
        gl_FragColor = vec4(c, uAlpha);
      }`
  });
  const skyDome = new THREE.Mesh(new THREE.SphereGeometry(R * 1.5, 40, 20, 0, Math.PI * 2, 0, Math.PI * 0.55), skyMat);
  skyDome.renderOrder = -10; skyDome.userData.noCollider = true; world.add(skyDome);

  const waterMat = new THREE.ShaderMaterial({
    depthWrite: false, fog: false, transparent: true,
    uniforms: { uAlpha: { value: 1 } },
    vertexShader: `varying vec2 vL; void main(){ vL = position.xy; gl_Position = projectionMatrix*modelViewMatrix*vec4(position,1.0); }`,
    fragmentShader: `
      precision highp float;
      uniform float uAlpha; varying vec2 vL;
      void main(){
        float f = clamp(length(vL) / 220.0, 0.0, 1.0);
        vec3 near = vec3(0.435, 0.565, 0.557), far = vec3(0.745, 0.788, 0.706);
        gl_FragColor = vec4(mix(near, far, pow(f, 0.7)), uAlpha);
      }`
  });
  const river = new THREE.Mesh(new THREE.CircleGeometry(R * 1.4, 72), waterMat);
  river.rotation.x = -Math.PI / 2; river.position.y = -0.03; river.renderOrder = -9;
  river.userData.noCollider = true; world.add(river);

  // the glass dome and its lip, for the modes you hold
  const glass = new THREE.Mesh(new THREE.SphereGeometry(R * 0.72, 48, 24, 0, Math.PI * 2, 0, Math.PI * 0.5), new THREE.ShaderMaterial({
    transparent: true, depthWrite: false, side: THREE.FrontSide, fog: false,
    uniforms: { uGlow: { value: 0 } },
    vertexShader: `varying vec3 vN; varying vec3 vV; void main(){ vec4 mv = modelViewMatrix*vec4(position,1.0); vN = normalize(normalMatrix*normal); vV = -mv.xyz; gl_Position = projectionMatrix*mv; }`,
    fragmentShader: `
      precision highp float;
      varying vec3 vN; varying vec3 vV; uniform float uGlow;
      void main(){
        float fr = pow(1.0 - max(0.0, dot(normalize(vN), normalize(vV))), 3.0);
        vec3 col = mix(vec3(0.88, 0.92, 0.86), vec3(0.95, 0.83, 0.55), uGlow);
        gl_FragColor = vec4(col, 0.04 + fr * (0.4 + uGlow * 0.4));
      }`
  }));
  glass.renderOrder = 12; glass.userData.noCollider = true; world.add(glass);
  const lip = new THREE.Mesh(new THREE.TorusGeometry(R * 0.73, 2.4, 8, 56), new THREE.MeshBasicMaterial({ color: 0xc9b58a, fog: false }));
  lip.rotation.x = Math.PI / 2; lip.position.y = 0.05; lip.userData.noCollider = true; world.add(lip);

  // the silk the scroll is painted on
  const paper = new THREE.Mesh(new THREE.PlaneGeometry(620, 190), new THREE.ShaderMaterial({vertexShader:`varying vec2 vUv;void main(){vUv=uv;gl_Position=projectionMatrix*modelViewMatrix*vec4(position,1.);}`,fragmentShader:`varying vec2 vUv;void main(){float grain=fract(sin(dot(vUv,vec2(127.1,311.7)))*43758.5453);float weave=sin(vUv.x*1400.)*sin(vUv.y*900.);vec3 silk=vec3(.80,.76,.63)+grain*.026+weave*.009;float river=(1.-smoothstep(.25,.46,vUv.y))*smoothstep(.04,.21,vUv.y);float wave=sin(vUv.y*430.+sin(vUv.x*50.)*.8);silk=mix(silk,vec3(.58,.69,.64),river*.3);silk-=vec3(.018)*river*pow(max(0.,wave),18.);gl_FragColor=vec4(silk,1.);}`}));
  paper.position.set(0, 38, -150); paper.renderOrder = -11; paper.userData.noCollider = true;
  paper.visible = false; world.add(paper);

  // the diorama frame around the scroll, the same wireframe-box treatment as Monet's cube mode
  const scrollFrameMat = new THREE.LineBasicMaterial({ color: 0xfff1de, transparent: true, opacity: 0.35 });
  const scrollFrame = new THREE.LineSegments(new THREE.EdgesGeometry(new THREE.BoxGeometry(SCROLL_BOX_HW * 2, SCROLL_BOX_H, SCROLL_BOX_ZF - SCROLL_BOX_ZB)), scrollFrameMat);
  scrollFrame.position.set(0, SCROLL_BOX_H / 2, (SCROLL_BOX_ZF + SCROLL_BOX_ZB) / 2);
  scrollFrame.userData.noCollider = true; scrollFrame.visible = false; world.add(scrollFrame);

  // ── the ranges ──────────────────────────────────────────────────────────
  // Each range is a chain of peaks; strokes fill the silhouette, greener at the
  // foot and bluer at the summit, and paler the further back it stands.
  const MTN_N = 14000, MIST_N = 460, TREE_N = 3200, WAVE_N = 2200;
  const mtn = layer(MTN_N, { renderOrder: 3 });
  const trees = layer(TREE_N, { renderOrder: 4 });
  const mist = layer(MIST_N, { renderOrder: 5 });
  const waves = layer(WAVE_N, { renderOrder: 2 });
  // distance, peak height, number of peaks, half-width in radians
  const RANGES = [
    { d: 30, h: 13, n: 3, w: 0.5 }, { d: 55, h: 24, n: 4, w: 0.75 }, { d: 88, h: 38, n: 5, w: 1.0 },
    { d: 125, h: 50, n: 5, w: 1.25 }, { d: 165, h: 56, n: 6, w: 1.5 }, { d: 205, h: 54, n: 7, w: 1.75 }
  ];
  const _pt = new THREE.Vector3();
  // In the scroll the ranges are not around you, they run along the silk: each
  // one is spread across the whole width, the way a handscroll overlaps them.
  function place(az, dist, y, spread) {
    if (MODE === "scroll") return _pt.set((az / (spread || 1.75)) * 205, y, -40 - dist * 0.45);
    return _pt.set(Math.sin(az) * dist, y, -Math.cos(az) * dist);
  }
  function ridge(az, k, peaks, spread) {                     // 0..1 profile of a range
    let v = 0;
    for (let p = 0; p < peaks; p++) {
      const c = -spread + (p + 0.5) * (2 * spread / peaks) + Math.sin(p * 9.3 + k) * 0.08;
      const w = spread / peaks * (0.7 + 0.5 * Math.abs(Math.sin(p * 4.7 + k)));
      const a = 0.5 + 0.5 * Math.abs(Math.sin(p * 2.9 + k * 1.7));
      v = Math.max(v, a * Math.exp(-Math.pow((az - c) / w, 2) * 1.5));
    }
    return v * (.88+.08*Math.sin(az*23+k)+.035*Math.sin(az*59+k*1.7)+.025*Math.cos(az*101));
  }
  // Continuous mineral underpainting plus contour ridges, kept in one draw call.
  const landGeometry=new THREE.BufferGeometry();
  const landMaterial=new THREE.ShaderMaterial({side:THREE.DoubleSide,vertexColors:true,
    vertexShader:`varying vec3 vColor; varying vec3 vLocal; void main(){vColor=color;vLocal=position;gl_Position=projectionMatrix*modelViewMatrix*vec4(position,1.);}`,
    fragmentShader:`varying vec3 vColor;varying vec3 vLocal;void main(){float fiber=sin(vLocal.y*19.+sin(vLocal.x*3.1)*3.)*sin(vLocal.x*13.7+vLocal.z*7.);float fold=sin(vLocal.x*1.8+sin(vLocal.y*.4)*2.+vLocal.y*.15);gl_FragColor=vec4(vColor*(.96+fiber*.055+fold*.035),1.);
#include <colorspace_fragment>
}`});
  const land=new THREE.Mesh(landGeometry,landMaterial);land.userData.noCollider=true;world.add(land);
  const contour=layer(2400,{renderOrder:3});
  function buildUnderpainting(){
    const positions=[],colors=[],indices=[];let ci=0;
    RANGES.forEach((rg,ri)=>{
      const base=positions.length/3,NX=180,NY=16,fade=ri/5;
      for(let x=0;x<=NX;x++){
        const az=-rg.w+2*rg.w*x/NX,prof=ridge(az,ri*3.1,rg.n,rg.w),top=prof*rg.h;
        for(let y=0;y<=NY;y++){
          const h=y/NY,dist=rg.d+(1-h)*6*(1+ri*.4)+Math.sin(x*.31+y*.26)*.45;
          const p=place(az,dist,.1+h*top,rg.w);positions.push(p.x,p.y,p.z);
          const col=PAL.malachite[1].clone().lerp(PAL.azurite[1],Math.pow(h,.65));
          const fold=.5+.5*Math.sin(az*55+Math.sin(h*6+ri)*2);
          col.multiplyScalar(.72+fold*.29).lerp(PAL.silk[2],fade*.48);
          if(h>.9) col.lerp(PAL.gold[0],.13);
          colors.push(col.r,col.g,col.b);
        }
        if(x<NX)for(let y=0;y<NY;y++){const a=base+x*(NY+1)+y,b=a+NY+1;indices.push(a,b,a+1,b,b+1,a+1);}
        if(ci<contour.n){const p=place(az,rg.d-.5,.12+top,rg.w),col=PAL.azurite[0].clone().lerp(PAL.silk[1],fade*.5);contour.set(ci++,p.x,p.y,p.z,col,MODE==='scroll'?2.8:rg.d*.015,.2+rg.d*.001,0,.8);}
      }
      // Delicate vertical cun texture along the folds, not oversized horizontal dabs.
      for(let k=0;k<180;k++){
        const az=rnd(-rg.w,rg.w),top=ridge(az,ri*3.1,rg.n,rg.w)*rg.h,y=rnd(.1,.92)*top;
        const p=place(az,rg.d-.7,y,rg.w),col=PAL.azurite[0].clone().lerp(PAL.silk[2],fade*.55);
        if(ci<contour.n)contour.set(ci++,p.x,p.y,p.z,col,.13+rg.d*.003,rnd(.6,2.2)*(1+rg.d/80),-.15+Math.sin(az*15)*.3,.28);
      }
    });
    if(!landGeometry.getAttribute('position')){landGeometry.setAttribute('position',new THREE.Float32BufferAttribute(positions,3));landGeometry.setAttribute('color',new THREE.Float32BufferAttribute(colors,3));landGeometry.setIndex(indices);}else{landGeometry.getAttribute('position').array.set(positions);landGeometry.getAttribute('position').needsUpdate=true;landGeometry.getAttribute('color').array.set(colors);landGeometry.getAttribute('color').needsUpdate=true;}landGeometry.computeBoundingSphere();
    for(;ci<contour.n;ci++)contour.set(ci,0,-999,0,PAL.ink[0],.01,.01,0,0);contour.flush(true);
  }

  const RANGE_W = [0.26, 0.2, 0.16, 0.14, 0.12, 0.12];
  function buildMountains() {
    let i = 0;
    RANGES.forEach((rg, ri) => {
      const per = Math.floor(MTN_N * RANGE_W[ri]);
      const fade = ri / (RANGES.length - 1);                 // aerial perspective
      const sc = rg.d / 46;                                  // strokes keep their apparent size
      for (let k = 0; k < per && i < MTN_N; k++, i++) {
        const az = rnd(-rg.w, rg.w);
        const prof = ridge(az, ri * 3.1, rg.n, rg.w);
        if (prof < 0.05) { mtn.set(i, 0, -999, 0, PAL.ink[0], 0.01, 0.01, 0, 0); continue; }
        const top = prof * rg.h;
        const y = Math.pow(random(), 0.7) * top;         // denser at the foot
        const hi = y / Math.max(top, 1e-3);
        const p = place(az, rg.d + (1-hi)*6*(1+ri*.4)-.4, y + .12, rg.w);
        let col = hi > 0.5 ? pick(PAL.azurite) : pick(PAL.malachite);
        col = col.clone().lerp(PAL.silk[0], fade * 0.3);
        if (hi > 0.55 && random() < 0.09 * (1 - fade)) col = col.clone().lerp(pick(PAL.gold), 0.55);
        const slope = -Math.sign(az) * (0.10 + 0.22 * hi) + (random() - 0.5) * 0.22;
        mtn.set(i, p.x, p.y, p.z, col, rnd(.55, 1.55) * sc, rnd(.2, .55) * sc, slope,
          (.65 + random() * .2) * (1 - fade * .3));
      }
    });
    for (; i < MTN_N; i++) mtn.set(i, 0, -999, 0, PAL.ink[0], 0.01, 0.01, 0, 0);
    mtn.flush(true);
  }
  function buildTrees() {
    let i = 0;
    const put = (x, y, z, col, w, h, a) => { if (i < TREE_N) trees.set(i++, x, y, z, col, w, h, (random() - 0.5) * 0.25, a); };
    // the shoreline at the foot of every range: ochre sand and green scrub
    RANGES.forEach((rg, ri) => {
      const sc = rg.d / 46, fade = ri / (RANGES.length - 1);
      const count = ri === 0 ? 260 : 150;
      for (let k = 0; k < count && i < TREE_N; k++) {
        const az = rnd(-rg.w, rg.w), d = rg.d + rnd(-5, 2) * (1 + ri * 0.6);
        const p = place(az, d, rnd(0, 1.2) * sc, rg.w).clone();
        const col = (random() < 0.45 ? pick(PAL.silk) : pick(PAL.malachite)).clone().lerp(PAL.silk[0], fade * 0.45);
        put(p.x, p.y, p.z, col, rnd(1.2, 3.4) * sc, rnd(0.3, 0.7) * sc, 0.75);
      }
    });
    for (let k = 0; k < 46 && i < TREE_N - 9; k++) {          // pines on the near shore
      const az = rnd(-0.55, 0.55), d = RANGES[0].d + rnd(-6, -1);
      const p = place(az, d, 0, 0.6).clone();
      const s = rnd(0.7, 1.5);
      for (let t = 0; t < 6; t++) put(p.x + rnd(-0.5, 0.5) * s, p.y + 1.6 * s + t * 0.85 * s, p.z + rnd(-0.5, 0.5) * s,
        pick(PAL.ink).clone().lerp(PAL.malachite[0], 0.5), (2.6 - t * 0.3) * s, 0.9 * s, 0.85);
      put(p.x, p.y + 0.8 * s, p.z, PAL.ink[0], 0.3 * s, 1.6 * s, 0.9);
    }
    for (let k = 0; k < 10 && i < TREE_N - 3; k++) {          // a village by the water
      const az = rnd(-0.45, 0.3), d = RANGES[0].d + rnd(-4, 1);
      const p = place(az, d, 0, 0.6).clone();
      put(p.x, p.y + 0.9, p.z, pick(PAL.silk), 2.6, 0.7, 0.9);
      put(p.x, p.y + 1.7, p.z, PAL.ink[1], 3.2, 0.5, 0.92);
    }
    for (let k = 0; k < 30 && i < TREE_N - 2; k++) {          // the long bridge
      const t = k / 29, az = -0.95 + t * 0.62, d = 22 - Math.sin(t * Math.PI) * 2.5;
      const p = place(az, d, 0, 1.0).clone();
      put(p.x, p.y + 1.6 + Math.sin(t * Math.PI) * 1.2, p.z, PAL.ink[1], 2.0, 0.35, 0.9);
    }
    for (const b of [[0.5, 15, 1], [-0.3, 21, 0.85]]) {       // boats
      const p = place(b[0], b[1], 0, 0.8).clone(), s = b[2];
      put(p.x, p.y + 0.35 * s, p.z, PAL.ink[0], 2.4 * s, 0.35 * s, 0.95);
      put(p.x + 0.3 * s, p.y + 1.2 * s, p.z, PAL.silk[2], 1.1 * s, 1.1 * s, 0.75);
    }
    for (; i < TREE_N; i++) trees.set(i, 0, -999, 0, PAL.ink[0], 0.01, 0.01, 0, 0);
    trees.flush(true);
  }
  function buildMist() {
    for (let i = 0; i < MIST_N; i++) {
      const ri = (random() * RANGES.length) | 0, rg = RANGES[ri];
      const sc = rg.d / 46;
      const az = rnd(-rg.w, rg.w), d = rg.d - rnd(2, 9) * (1 + ri * 0.4);
      const p = place(az, d, rnd(0.5, 0.35 * rg.h), rg.w);
      mist.set(i, p.x, p.y, p.z, pick(PAL.mist), rnd(3, 9) * sc, rnd(0.3, 0.9) * sc, (random() - 0.5) * 0.1,
        0.035 + random() * 0.075);
    }
    mist.flush(true);
  }
  function buildWaves() {
    for (let i = 0; i < WAVE_N; i++) {
      const az = MODE === "scroll" ? rnd(-1.8, 1.8) : rnd(-Math.PI, Math.PI), d = 3 + Math.pow(random(), 1.6) * 170;
      const p = place(az, d, 0.05, 1.8);
      const col = pick(PAL.water).clone().lerp(PAL.silk[0], Math.min(0.55, d / 300));
      waves.set(i, p.x, p.y, p.z, col, rnd(1.2, 3.6) * (0.5 + d / 55), rnd(0.10, 0.26) * (0.5 + d / 80), 0, 0.45 + random() * 0.35);
    }
    waves.flush(true);
  }

  function applyPose() {
    if (MODE === "scroll") {
      const s = SCROLL_SCALE * globePose.scale;
      world.scale.set(s, s * SCROLL_STRETCH, s);
      world.position.copy(globePose.pos);
      world.position.y += 0.22 * globePose.scale;
      world.rotation.set(0, globePose.yaw, 0);
    } else if (isWidget()) {
      world.scale.setScalar(GLOBE_SCALE * globePose.scale);
      world.position.copy(globePose.pos);
      world.rotation.set(0, globePose.yaw, 0);
    } else {
      world.scale.setScalar(1); world.position.set(0, 0, 0); world.rotation.set(0, 0, 0);
    }
    world.updateMatrixWorld(true);
  }
  function applyMode() {
    applyPose();
    skyDome.visible = MODE !== "scroll";
    river.visible = MODE !== "scroll";
    paper.visible = MODE === "scroll";
    scrollFrame.visible = MODE === "scroll";
    glass.visible = MODE === "globe";
    lip.visible = MODE === "globe";
    seed=73021;
    buildUnderpainting();buildMountains(); buildTrees(); buildMist(); buildWaves();
    onModeChanged();
  }

  // ── hands, the same reach rule as the other worlds ───────────────────────
  const mkHand = (side) => ({
    side, pos: new THREE.Vector3(), prev: new THREE.Vector3(), vel: new THREE.Vector3(),
    local: new THREE.Vector3(), localVel: new THREE.Vector3(), pinch: 0, active: false, wasActive: false, palmUp: false
  });
  const hands = { left: mkHand("left"), right: mkHand("right") };
  const _rp = new THREE.Vector3(), _rl = new THREE.Vector3(), _prev = new THREE.Vector3();
  function withinPaint(p) {
    if (isWidget()) return p.distanceTo(globePose.pos) < R * GLOBE_SCALE * globePose.scale * 1.1;
    return p.y < 2.0;
  }
  function rayTarget(src) {
    const o = src.ray.origin, d = src.ray.dir;
    if (isWidget()) {
      _rl.copy(globePose.pos).sub(o);
      const t = _rl.dot(d);
      if (t < 0.05) return null;
      _rp.copy(o).addScaledVector(d, t);
      return _rp.distanceTo(globePose.pos) < R * GLOBE_SCALE * globePose.scale ? _rp : null;
    }
    if (d.y > -0.02) return null;
    const t = -o.y / d.y;
    return t > 0.2 && t < 200 ? _rp.copy(o).addScaledVector(d, t) : null;
  }
  function readHands(dt) {
    for (const s of ["left", "right"]) { hands[s].prev.copy(hands[s].pos); hands[s].active = false; }
    for (const g of app.im.groups.values()) {
      const src = g.source;
      const h = hands[src.handedness === "left" ? "left" : "right"];
      if (h.active || g.list.some((i) => i.selecting)) continue;
      let p = null, pinch = 0, palmUp = false;
      if (src.kind === "hand" && src.tracked) { p = src.pinchPoint; pinch = src.pinchValue; palmUp = src.palmFacingHead; }
      else if (src.kind === "controller" && src.tracked) { p = src.nearPoint; pinch = Math.max(src.selectValue || 0, src.select ? 1 : 0); }
      else if (src.ray.valid) pinch = src.select ? 1 : 0;
      if (!p || (pinch > 0.05 && !withinPaint(p))) {
        const hit = src.ray.valid && pinch > 0.05 ? rayTarget(src) : null;
        if (hit) p = hit; else if (!p) continue;
      }
      h.active = true; h.palmUp = palmUp; h.pinch = pinch;
      h.pos.copy(p);
      if (!h.wasActive) h.prev.copy(h.pos);
      h.vel.copy(h.pos).sub(h.prev).divideScalar(Math.max(dt, 1e-3));
      h.local.copy(h.pos); world.worldToLocal(h.local);
      _prev.copy(h.prev); world.worldToLocal(_prev);
      h.localVel.copy(h.local).sub(_prev).divideScalar(Math.max(dt, 1e-3));
      h.wasActive = true;
    }
  }

  // ── per-frame ───────────────────────────────────────────────────────────
  let simT = 0;
  function sweep(L, i, h, radius, strength, dt, swirl) {
    const i3 = i * 3;
    const dx = L.pos[i3] - h.local.x, dy = L.pos[i3 + 1] - h.local.y, dz = L.pos[i3 + 2] - h.local.z;
    const d2 = dx * dx + dy * dy + dz * dz;
    if (d2 > radius * radius || d2 < 1e-6) return 0;
    const d = Math.sqrt(d2), f = 1 - d / radius, s = f * strength * dt;
    L.vel[i3] += (dx / d) * s + h.localVel.x * f * dt * 0.8 - (swirl ? dz / d : 0) * s * 0.8;
    L.vel[i3 + 1] += (dy / d) * s * 0.5 + h.localVel.y * f * dt * 0.8;
    L.vel[i3 + 2] += (dz / d) * s + h.localVel.z * f * dt * 0.8 + (swirl ? dx / d : 0) * s * 0.8;
    return f;
  }
  function spring(L, i, k, damp, dt) {
    const i3 = i * 3;
    for (let c = 0; c < 3; c++) {
      L.vel[i3 + c] += (L.home[i3 + c] - L.pos[i3 + c]) * k * dt;
      L.vel[i3 + c] *= Math.pow(damp,dt*60);
      L.pos[i3 + c] += L.vel[i3 + c] * dt;
    }
  }
  function update(dt, now) {
    readHands(dt);
    for(const h of Object.values(hands)) if(!h.active) h.wasActive=false;
    simT += dt;
    const t = simT;
    const u = isWidget() ? 1 / world.scale.x : 1;
    const rad = isWidget() ? 0.16 * u : 3.2;
    const kF = isWidget() ? u * 0.05 : 1;
    const act = [hands.left, hands.right].filter((h) => h.active && !h.palmUp);
    const stir = act.filter((h) => h.pinch > 0.6);

    for (let i = 0; i < MIST_N; i++) {                     // the mist drifts, and takes your hand's stroke
      const i3 = i * 3, ph = mist.phase[i];
      mist.home[i3] += Math.sin(t * 0.13 + ph) * .36 * dt;
      mist.home[i3 + 1] += Math.cos(t * 0.09 + ph) * .18 * dt;
      for (const h of act) sweep(mist, i, h, rad * (h.pinch > 0.6 ? 1.4 : 1.1), (h.pinch > 0.6 ? 9 : 3) * kF, dt, h.pinch > 0.6);
      spring(mist, i, 0.8, 0.965, dt);
      mist.alpha[i] = mist.baseAlpha[i] * (0.8 + 0.3 * Math.sin(t * 0.5 + ph));
    }
    mist.flush();

    for (let i = 0; i < WAVE_N; i++) {                     // the river answers more crisply
      const i3 = i * 3, ph = waves.phase[i];
      waves.home[i3 + 1] = 0.02 + Math.sin(t * 0.8 + ph) * 0.05;
      for (const h of act) sweep(waves, i, h, rad, (h.pinch > 0.6 ? 12 : 4) * kF, dt, h.pinch > 0.6);
      spring(waves, i, 5.0, 0.93, dt);
      waves.rot[i] = Math.sin(t * 0.6 + ph) * 0.05;
    }
    waves.flush();

    { // Continue settling after release; never leave trees suspended.
      for (let i = 0; i < TREE_N; i++) {
        for (const h of stir) sweep(trees, i, h, rad * 0.8, 5 * kF, dt, false);
        spring(trees, i, 7.0, 0.9, dt);
      }
      trees.flush();
    }
  }

  applyMode();
  return {
    world, glass, globePose, R, GLOBE_SCALE, isWidget, hands,
    handleRadius() { return MODE === "scroll" ? 0.95 * globePose.scale : R * GLOBE_SCALE * globePose.scale * 1.12; },
    update, applyMode,
    setMode(m) { MODE = m; applyMode(); },
    get mode() { return MODE; },
    recentre() {
      const fwd = new THREE.Vector3(0, 0, -1).applyQuaternion(CAM.quaternion); fwd.y = 0; fwd.normalize();
      globePose.pos.copy(CAM.position).add(fwd.multiplyScalar(0.62)); globePose.pos.y = CAM.position.y - 0.45;
      globePose.yaw = Math.atan2(fwd.x, fwd.z) + Math.PI; globePose.scale = 1;
      if (isWidget()) applyPose();
    },
    setPose(pos, scale, yaw) { globePose.pos.copy(pos); globePose.scale = scale; globePose.yaw = yaw; applyPose(); },
    setHandleHot(v) { glass.material.uniforms.uGlow.value += ((v ? 1 : 0) - glass.material.uniforms.uGlow.value) * 0.2; },
    setAlpha(a) { skyMat.uniforms.uAlpha.value = a; waterMat.uniforms.uAlpha.value = a; skyMat.transparent = a < 0.999; waterMat.transparent = true; },
    onMode(fn) { onModeChanged = fn; },
    N: MTN_N + TREE_N + MIST_N + WAVE_N + contour.n
  };
}
var GALLERY_VERSION = "0.7.2";


// ---------------------------------------------------------------------------
// Preview spheres: a small painted globe of each work, for the gallery plinths.
// ---------------------------------------------------------------------------
var PREVIEW_COMMON = `
  precision highp float;
  uniform float uTime; uniform float uHover; uniform float uOpen;
  float hash3(vec3 p) { p = fract(p * 0.3183099 + vec3(0.1, 0.2, 0.3)); p *= 17.0; return fract(p.x * p.y * p.z * (p.x + p.y + p.z)); }
  float noise3(vec3 p) { vec3 i = floor(p); vec3 f = fract(p); f = f * f * (3.0 - 2.0 * f);
    return mix(mix(mix(hash3(i), hash3(i + vec3(1,0,0)), f.x), mix(hash3(i + vec3(0,1,0)), hash3(i + vec3(1,1,0)), f.x), f.y),
               mix(mix(hash3(i + vec3(0,0,1)), hash3(i + vec3(1,0,1)), f.x), mix(hash3(i + vec3(0,1,1)), hash3(i + vec3(1,1,1)), f.x), f.y), f.z); }
  float fbm(vec3 p) { float a = 0.5, s = 0.0; for (int i = 0; i < 3; i++) { s += a * noise3(p); p = p * 2.03 + vec3(1.7, 9.2, 3.1); a *= 0.5; } return s; }
  vec3 rotAxis(vec3 v, vec3 ax, float a) { float c = cos(a), s = sin(a); return v * c + cross(ax, v) * s + ax * dot(ax, v) * (1.0 - c); }
  float glow(vec3 p, vec3 s, float size) { float a = acos(clamp(dot(p, normalize(s)), -1.0, 1.0)); return exp(-a * a / (size * size)); }`;

// Baked once into an equirectangular texture and shown on a plain unlit sphere.
// A live ShaderMaterial here is the one thing that was not identical in both eyes
// on device; a texture on MeshBasicMaterial is the most ordinary path there is.
var PREVIEW_CACHE = /* @__PURE__ */ new Map();
var PREVIEW_MAIN = `
  varying vec2 vUv;
  vec3 art(vec3 p, vec3 n, float t);
  void main() {
    float theta = (1.0 - vUv.y) * 3.14159265;
    float phi = vUv.x * 6.28318531;
    vec3 n = vec3(-cos(phi) * sin(theta), cos(theta), sin(phi) * sin(theta));
    gl_FragColor = vec4(art(n, n, uTime), 1.0);
  }
`;
function previewTexture(app, THREE, art) {
  if (PREVIEW_CACHE.has(art.id)) return PREVIEW_CACHE.get(art.id);
  const rt = new THREE.WebGLRenderTarget(1024, 512, { depthBuffer: false, stencilBuffer: false });
  rt.texture.colorSpace = THREE.SRGBColorSpace;      // round-trips to what the shader drew
  rt.texture.generateMipmaps = true;
  rt.texture.minFilter = THREE.LinearMipmapLinearFilter;
  const mat = new THREE.ShaderMaterial({
    uniforms: { uTime: { value: 7.5 }, uHover: { value: 0 }, uOpen: { value: 0 } },
    vertexShader: `varying vec2 vUv; void main() { vUv = uv; gl_Position = vec4(position.xy, 0.0, 1.0); }`,
    fragmentShader: PREVIEW_COMMON + PREVIEW_MAIN + art.glsl
  });
  const quad = new THREE.Mesh(new THREE.PlaneGeometry(2, 2), mat);
  const scene = new THREE.Scene(); scene.add(quad);
  const cam = new THREE.Camera();
  const r = app.renderer, wasXR = r.xr.enabled, prevTarget = r.getRenderTarget();
  r.xr.enabled = false;                              // bake off the XR camera
  try { r.setRenderTarget(rt); r.render(scene, cam); }
  finally { r.setRenderTarget(prevTarget); r.xr.enabled = wasXR; }
  quad.geometry.dispose(); mat.dispose();
  rt.texture.userData.sharedPreview=true;
  PREVIEW_CACHE.set(art.id, rt.texture);
  return rt.texture;
}

var STARRY_PREVIEW_GLSL = `
    const vec3 DEEP = vec3(0.039, 0.086, 0.216);
    const vec3 COBALT = vec3(0.110, 0.247, 0.561);
    const vec3 SKYC = vec3(0.357, 0.576, 0.839);
    const vec3 PALE = vec3(0.663, 0.784, 0.910);
    const vec3 GOLD = vec3(0.965, 0.843, 0.420);
    const vec3 IVORY = vec3(0.984, 0.945, 0.760);
    vec3 swirl(vec3 p, vec3 ax, float k, float r, float ph) {
      float ang = acos(clamp(dot(p, ax), -1.0, 1.0));
      return rotAxis(p, ax, exp(-ang * ang / (2.0 * r * r)) * k * (1.4 + 0.5 * sin(ph)));
    }
    vec3 art(vec3 p0, vec3 n, float t) {
      vec3 p = p0;
      p = swirl(p, normalize(vec3(0.30, 0.50, -0.81)), 2.2, 0.48, t * 0.45);
      p = swirl(p, normalize(vec3(-0.60, 0.36, -0.72)), -1.6, 0.32, t * 0.45 + 2.1);
      p = swirl(p, normalize(vec3(0.55, 0.42, 0.72)), 1.3, 0.38, t * 0.45 + 4.0);
      p = rotAxis(p, vec3(0.0, 1.0, 0.0), t * 0.05);
      vec3 q = p * 2.3;
      float n1 = fbm(q), n2 = fbm(q + vec3(5.2, 1.3, 2.8));
      float v = smoothstep(0.30, 0.86, fbm(q + 1.7 * vec3(n1, n2, n1 * 0.6 + n2 * 0.4)));
      vec3 col = mix(DEEP * 0.8, COBALT, smoothstep(0.0, 0.6, v));
      col = mix(col, SKYC, smoothstep(0.55, 0.95, v) * 0.85);
      col = mix(col, PALE, smoothstep(0.9, 1.0, v) * 0.4);
      col *= 0.85 + 0.3 * noise3(p * vec3(40.0, 9.0, 40.0));
      float s = 0.0;
      s += glow(n, vec3(0.18, 0.62, -0.76), 0.16) * 1.2;
      s += glow(n, vec3(0.52, 0.48, -0.70), 0.12);
      s += glow(n, vec3(-0.30, 0.55, -0.78), 0.11);
      s += glow(n, vec3(-0.62, 0.40, -0.68), 0.13);
      s += glow(n, vec3(-0.05, 0.80, -0.60), 0.10);
      s += glow(n, vec3(0.62, 0.72, 0.31), 0.12);
      s += glow(n, vec3(-0.55, 0.66, 0.51), 0.11);
      s += glow(n, vec3(0.10, 0.45, 0.89), 0.10);
      col = mix(col, GOLD, clamp(s, 0.0, 1.0) * 0.85);
      col += IVORY * pow(glow(n, vec3(0.82, 0.52, -0.25), 0.2), 2.0) * 1.2;
      col = mix(col, DEEP * 0.45, smoothstep(-0.05, -0.35, n.y) * 0.85);
      return col;
    }`;

var MONET_PREVIEW_GLSL = `
    vec3 art(vec3 p0, vec3 n, float t) {
      vec3 sun = normalize(vec3(0.10, 0.12, 0.985));   // turned to face whoever is looking
      vec3 ZEN = vec3(0.404, 0.435, 0.478);
      vec3 MID = vec3(0.612, 0.608, 0.596);
      vec3 HAZE = vec3(0.788, 0.737, 0.667);
      vec3 WARM = vec3(0.902, 0.663, 0.435);
      vec3 col;
      float sd = max(dot(n, sun), 0.0);
      if (n.y > -0.02) {                                   // the sky half
        col = mix(MID, ZEN, smoothstep(0.02, 0.8, n.y));
        col = mix(col, HAZE, smoothstep(0.4, -0.02, n.y));
        col = mix(col, WARM, pow(sd, 6.0) * 0.8);
        col *= 0.92 + 0.16 * fbm(vec3(n.x * 3.0, n.y * 9.0, n.z * 3.0) + vec3(t * 0.05, 0.0, 0.0));
        col += vec3(0.98, 0.45, 0.15) * pow(sd, 700.0) * 2.2;
        col = mix(col, vec3(0.92, 0.60, 0.35), pow(sd, 30.0) * 0.5);      // the disc itself
      } else {                                             // the water half, in flat strokes
        vec3 COOL = vec3(0.215, 0.290, 0.360);
        vec3 COOL2 = vec3(0.420, 0.505, 0.580);
        float band = fbm(vec3(n.x * 2.0, n.y * 26.0, n.z * 2.0) + vec3(t * 0.06, 0.0, 0.0));
        col = mix(COOL, COOL2, smoothstep(0.35, 0.72, band));
        vec3 refl = normalize(vec3(sun.x, -abs(sun.y), sun.z));
        float lane = exp(-pow(acos(clamp(dot(normalize(vec3(n.x, 0.0, n.z)), normalize(vec3(sun.x, 0.0, sun.z))), -1.0, 1.0)), 2.0) / 0.10);
        float dash = smoothstep(0.45, 0.75, fbm(vec3(n.x * 4.0, n.y * 34.0, n.z * 4.0) + vec3(t * 0.5, 0.0, 0.0)));
        col = mix(col, vec3(0.910, 0.490, 0.180), lane * dash * (1.0 - smoothstep(-0.05, -0.95, n.y)) * 1.0);
        col = mix(col, vec3(0.96, 0.78, 0.55), lane * dash * pow(max(-n.y, 0.0), 0.5) * 0.25);
        col = mix(col, vec3(0.106, 0.145, 0.188), smoothstep(-0.55, -0.95, n.y) * 0.7);
      }
      col = mix(col, vec3(0.658, 0.662, 0.627), pow(1.0 - abs(n.y), 8.0) * 0.35);   // haze at the waterline
      return col;
    }`;

var QIANLI_PREVIEW_GLSL = `
    vec3 art(vec3 p0, vec3 n, float t) {
      vec3 SILK = vec3(0.855, 0.788, 0.627);
      vec3 SILK2 = vec3(0.741, 0.722, 0.608);
      vec3 MAL = vec3(0.129, 0.384, 0.263);
      vec3 MAL2 = vec3(0.278, 0.596, 0.396);
      vec3 AZ = vec3(0.075, 0.243, 0.384);
      vec3 AZ2 = vec3(0.145, 0.392, 0.545);
      vec3 WATER = vec3(0.318, 0.494, 0.478);
      vec3 GOLD = vec3(0.902, 0.812, 0.573);
      float az = atan(n.x, n.z);
      float el = n.y;
      vec3 col = mix(SILK, SILK2, smoothstep(0.0, 0.9, el));           // silk ground
      col *= 0.97 + 0.05 * fbm(vec3(n.x * 7.0, n.y * 7.0, n.z * 7.0));
      // four ranges: the far ones sit high and pale, the near ones low and deep
      for (int k = 0; k < 4; k++) {
        float fk = float(k);
        float far = 1.0 - fk / 3.0;                                    // 1 = furthest
        float ph = fk * 2.3;
        float base = 0.40 - fk * 0.115;
        float amp = 0.20 - fk * 0.035;
        float ridge = base
          + amp * (0.62 * sin(az * (1.6 + fk * 0.8) + ph) + 0.30 * sin(az * (3.7 + fk) - ph * 1.4)
                 + 0.18 * sin(az * (7.0 + fk * 2.0) + ph * 0.7))
          + 0.035 * fbm(vec3(az * 2.5 + ph, fk, 0.0));
        float m = smoothstep(ridge + 0.010, ridge - 0.010, el);        // below the ridge is rock
        float band = clamp((ridge - el) / (0.34 - fk * 0.05), 0.0, 1.0);  // summit to foot
        vec3 rock = mix(AZ, MAL, smoothstep(0.1, 0.75, band));
        rock = mix(rock, band > 0.5 ? MAL2 : AZ2, 0.4 * fbm(vec3(n.x * 18.0, n.y * 18.0, n.z * 18.0)));
        rock = mix(rock, SILK, 0.24 * far);                            // aerial distance
        col = mix(col, rock, m);
        float rim = smoothstep(0.016, 0.0, abs(el - ridge)) * (1.0 - far * 0.7);
        col = mix(col, GOLD, rim * 0.55);
        col = mix(col, vec3(0.925, 0.937, 0.898), smoothstep(0.04, 0.0, el - ridge + 0.05) * m * 0.10);  // mist at the foot
      }
      // the river: jade, with the pale strokes of the current
      float w = smoothstep(-0.14, -0.30, el);
      vec3 water = mix(WATER, vec3(0.463, 0.600, 0.573), 0.4 + 0.35 * sin(az * 2.0));
      water *= 0.93 + 0.10 * sin(el * 120.0 + fbm(vec3(n.x * 4.0, 0.0, n.z * 4.0)) * 7.0);
      col = mix(col, water, w);
      col = mix(col, vec3(0.918, 0.925, 0.878), smoothstep(-0.02, -0.10, el) * 0.10);
      return col;
    }`;

var ART = [
  { id: "starry-night", title: "The Starry Night", byline: "after Vincent van Gogh, 1889", glsl: STARRY_PREVIEW_GLSL },
  { id: "impression-sunrise", title: "Impression, Sunrise", byline: "after Claude Monet, Le Havre 1872", glsl: MONET_PREVIEW_GLSL },
  { id: "qianli-jiangshan", title: "Rivers and Mountains", byline: "\u5343\u91cc\u6c5f\u5c71\u5716 \u00b7 after Wang Ximeng, 1113", glsl: QIANLI_PREVIEW_GLSL },
  { id:"living-ink", title:"Living Ink", byline:"Rongxuan Mu · a study in movement", glsl:`vec3 art(vec3 p,vec3 n,float t){float ink=fbm(p*8.);float brush=sin(p.x*12.+p.y*5.+fbm(p*4.)*8.);vec3 paper=vec3(.88,.84,.73);return mix(paper,vec3(.055,.11,.1),smoothstep(.3,.55,brush)*smoothstep(.35,.55,ink));}` }
];

// ---------------------------------------------------------------------------
// The hand menu belongs to the world you are in: it shows that world's own
// controls, and the framework's settings sit one tap away behind "Settings".
// ---------------------------------------------------------------------------
function navButtons(app) {
  if (app._nav) return app._nav;
  const b = (label, onClick) => new UIButton(app.im, label, { w: 0.075, h: 0.026, fontSize: 24, onClick });
  app._nav = {
    home: b("\u2190 Gallery", () => app.worlds.load("gallery")),
    settings: b("Settings \u2026", () => showMenuPage(app, "system")),
    back: b("\u2190 Back", () => showMenuPage(app, "world"))
  };
  return app._nav;
}

function setWorldMenu(app, world, ctx) {
  if (!app._baseMenu) app._baseMenu = app.menu.items.filter((i) => i !== app.opacitySlider);
  app._world = world; app._worldCtx = ctx;
  try { app._worldItems = (world && world.menuItems) ? (world.menuItems(ctx) || []) : []; }
  catch (e) { console.error(e); app._worldItems = []; }
  showMenuPage(app, "world");
}

function showMenuPage(app, page) {
  const menu = app.menu, nav = navButtons(app), world = app._world;
  const inGallery = !world || world.id === "gallery";
  let items, slider = null, title;
  if (page === "system") {
    items = app._baseMenu.filter((i) => i !== app.menuButtons.home).concat([nav.back]);
    slider = app.opacitySlider;
    title = "VibeXR \u00b7 Settings";
  } else {
    items = (app._worldItems || []).concat(inGallery ? [nav.settings] : [nav.home, nav.settings]);
    title = ((world && world.title) || "VibeXR");
  }
  const rows = Math.ceil(items.length / 2);
  const h = 0.028 + rows * 0.032 + (slider ? 0.048 : 0.016);
  const old = menu.panel;
  for (const i of menu.items) i.root.removeFromParent();       // keep the buttons, drop the panel
  menu.items = [];
  if (Math.abs(old.h - h) > 1e-4 || old._title !== title) {
    const np = new UIPanel(title, { w: 0.17, h });
    np._title = title;
    np.root.visible = old.root.visible;
    np.root.position.copy(old.root.position);
    np.root.quaternion.copy(old.root.quaternion);
    np.root.scale.copy(old.root.scale);
    old.root.parent?.add(np.root);
    old.root.removeFromParent();
    old.root.traverse((o) => { o.geometry?.dispose?.(); if (o.material) { o.material.map?.dispose?.(); o.material.dispose?.(); } });
    menu.panel = np; menu.root = np.root;
  }
  menu.setItems(items, slider);
  app._menuPage = page;
}

// ---------------------------------------------------------------------------
// Gallery: the lobby. Each work is a painted sphere on a plinth; tap to enter.
// ---------------------------------------------------------------------------
var Gallery = {
  id: "gallery",
  title: "Gallery",
  init(ctx) {
    const { root, THREE: T, app } = ctx;
    this.app = app;
    const top = calibratedTableTop(app);
    root.add(new T.HemisphereLight(0xcfe0ff, 0x202030, 1.4));
    this.balls = [];
    this.entering = null;
    this.time = 0;
    setImmersive(app, false);      // the hall is your room
    const portalSpots = [
      [-.64,.40,-1.05],[-.23,.16,-.72],[.22,.57,-1.19],[.66,.25,-.88]
    ];
    ART.forEach((a, i) => {
      const spot=portalSpots[i];
      const x=spot[0]+(Math.random()-.5)*.06;
      const y=top+spot[1]+(Math.random()-.5)*.04;
      const z=spot[2]+(Math.random()-.5)*.06;
      const tex = previewTexture(app, T, a);
      const mat = new T.MeshBasicMaterial({ map: tex, toneMapped: false });
      const organicGeo=new T.SphereGeometry(0.12,48,32);
      const positions=organicGeo.attributes.position;
      for(let j=0;j<positions.count;j++){
        const x=positions.getX(j),y=positions.getY(j),z=positions.getZ(j);
        const swell=1+.10*Math.sin(x*24+i*1.7)*Math.cos(y*19-z*16)+.055*Math.sin(y*35+z*22+i);
        positions.setXYZ(j,x*swell*(1+i*.025),y*swell*(1.08-i*.025),z*swell);
      }
      organicGeo.computeVertexNormals();organicGeo.computeBoundingSphere();
      const ball = new T.Mesh(organicGeo, mat);
      ball.position.set(x, y, z); ball.name = `preview-${a.id}`;
      ball.userData.noHighlight = true;
      root.add(ball);
      // hover: a soft shell around the globe, additive and view-independent
      const halo = new T.Mesh(organicGeo.clone().scale(1.065,1.065,1.065), new T.MeshBasicMaterial({
        color: 0xf6d76b, transparent: true, opacity: 0, blending: T.AdditiveBlending,
        side: T.BackSide, depthWrite: false, toneMapped: false
      }));
      halo.userData.noCollider = true; halo.userData.noHighlight = true;
      ball.add(halo);
      const title = ctx.label(a.title, { height: 0.025, color: "#f6d76b" });
      title.position.set(x, y + .20, z); root.add(title);
      const by = ctx.label(`${a.byline}`, { height: 0.011, color: "#cfe0ff" });
      by.position.set(x, y + .165, z); root.add(by);
      const it = ctx.add(ball, {});
      const st = { a, ball, mat, halo, it, hover: 0, hovering: false, base: ball.position.clone(), labels: [title, by], phase: i * 1.7 };
      it.on("hoverenter", () => { st.hovering = true; });
      it.on("hoverexit", () => { st.hovering = false; });
      it.on("tap", () => this.enterArt(st));
      this.balls.push(st);
    });
    const hint = ctx.label("Pinch, trigger or poke a sphere to step inside · palm up for the menu", { height: 0.014, color: "#8fa6c8" });
    hint.position.set(0, top + 0.03, -0.72); hint.rotation.x = -0.9; root.add(hint);
  },
  menuItems(ctx) { return []; },
  enterArt(st) {
    if (this.entering) return;
    this.entering = { st, t: 0 };
    this.app.log(`entering ${st.a.title}`);
  },
  update(dt, t, ctx) {
    const head = ctx.app.im.head;
    this.time += Math.min(dt, 0.05); t = this.time;
    for (const s of this.balls) {
      s.hover += ((s.hovering ? 1 : 0) - s.hover) * Math.min(1, dt * 10);
      s.halo.material.opacity = s.hover * 0.28;
      s.ball.rotation.y += dt * 0.12;
      if (!this.entering) {
        // breathing: a slow rise and fall with a small swell in the same rhythm
        const br = Math.sin(t * 0.9 + s.phase), br2 = Math.sin(t * 1.8 + s.phase * 1.3);
        s.ball.position.set(
          s.base.x+Math.sin(t*.31+s.phase)*.015,
          s.base.y+br*.022+br2*.004,
          s.base.z+Math.sin(t*.23+s.phase*1.4)*.012);
        s.labels.forEach((label,j)=>label.position.copy(s.ball.position).add(new ctx.THREE.Vector3(0,j===0?.20:.165,0)));
        s.ball.scale.setScalar((1 + br * 0.018) * (1 + 0.06 * s.hover));
      }
      for (const l of s.labels) if (head) l.lookAt(head.x, l.position.y, head.z);
    }
    const e = this.entering;
    if (e) {
      e.t += dt;
      const k = Math.min(1, e.t / 0.7), ease = k * k * (3 - 2 * k);
      e.st.ball.scale.setScalar(1 + ease * 0.7);          // grow in place: flying it into your face reads badly in stereo
      e.st.halo.material.opacity = 0.28 + ease * 0.5;
      if (k >= 1 && !e.done) { e.done = true; ctx.app.worlds.load(e.st.a.id); }
    }
  }
};

// ---------------------------------------------------------------------------
// Shared bits for a world you stand inside: the camera has to see past 100 m,
// and the framework's background opacity drives how much of the room is left.
// ---------------------------------------------------------------------------
function enterArtWorld(world, ctx) {
  const app = ctx.app;
  world.app = app;
  world.time = 0;
  world._opacity = app.sessionMode === "ar" && app.vst.supported ? app.vst.target : null;
  // no floating button inside an artwork: the hand menu carries "← Gallery"
}
function exitArtWorld(world, ctx) {
  const app = ctx.app;
  if (world._opacity !== null) app.setOpacity(world._opacity, false);
}
// where the head is, whichever part of the framework has it first
function headPos(app, out) {
  if (app.im && app.im.head) return out.copy(app.im.head);
  if (app.input && app.input.head) return out.copy(app.input.head);
  return app.camera.getWorldPosition(out);
}
// how opaque the artwork should be right now: fully in VR, the slider's value in passthrough
function artAlpha(app) { return app.sessionMode === "ar" ? app.vst.opacity : 1; }
// When the world paints its own sky, the framework's dark backdrop has nothing
// left to do — it would only sit behind the painting and dull it.
function ownSky(app, has) { if (has) app.backdrop.visible = false; }
// Anything that is not a world you stand inside belongs in your room: the
// gallery and every widget mode start with passthrough on, the immersive modes
// take the background opaque. (The Background slider still overrides by hand.)
function setImmersive(app, on) {
  if (app.sessionMode !== "ar" || !app.vst.supported) return;
  app.setOpacity(on ? 1 : 0, false);
}
// every source whose pinch / trigger isn't aimed at something interactive
function freeSelects(app, onDown, onHold, onEnd, held) {
  const live = new Set();
  for (const g of app.im.groups.values()) {
    const src = g.source; live.add(src);
    const cur = held.get(src);
    if (cur) {
      if (!src.select || !src.ray.valid) { onEnd(src, cur); held.delete(src); }
      else onHold(src, cur);
      continue;
    }
    if (!src.selectDown || !src.ray.valid) continue;
    if (src.kind === "hand" && src.palmFacingHead) continue;
    if (g.list.some((i) => i.hover || i.selecting)) continue;
    const made = onDown(src);
    if (made) held.set(src, made);
  }
  for (const [src, v] of held) if (!live.has(src)) { onEnd(src, v); held.delete(src); }
}

// ---------------------------------------------------------------------------
// The Starry Night. Pinch / trigger at the sky to stir a vortex; the hand menu
// carries the dome / sphere / cube modes, and in the volume modes you can pick
// the whole painting up and scale it with two hands.
// ---------------------------------------------------------------------------
var StarryNight = {
  id: "starry-night",
  title: "The Starry Night",
  init(ctx) {
    const { root, THREE: T, app } = ctx;
    enterArtWorld(this, ctx);
    this.sn = buildStarryNight(T, root);
    this.sn.dabUniforms.uSize.value = app.sessionMode ? 1.6 : 1.35;
    setImmersive(app, true);       // you stand under this sky
    this.held = new Map();
    this.sign = new Map();
    this.sq = new Map();
    // an invisible handle for the volume modes, so the framework's own grab works on it
    const proxy = new T.Mesh(new T.SphereGeometry(1, 20, 14), new T.MeshBasicMaterial({ transparent: true, opacity: 0, depthWrite: false }));
    proxy.name = "painting"; proxy.visible = false; proxy.userData.noHighlight = true;
    proxy.position.copy(this.sn.dabUniforms.uVolCenter.value);
    proxy.scale.setScalar(this.sn.dabUniforms.uVolR.value);
    root.add(proxy);
    this.proxyIt = ctx.add(proxy, { draggable: true, twoHand: true });
    this.proxy = proxy;
    ctx.log(`Starry Night: ${this.sn.N.toLocaleString()} particles`);
  },
  menuItems(ctx) {
    const sn = this.sn;
    const btns = ["Dome", "Sphere", "Cube"].map((label, i) => ctx.button(label, {
      w: 0.075, h: 0.026, fontSize: 24, toggle: true, value: i === sn.shape.target,
      onClick: () => { this.setShape(ctx, i); }
    }));
    this.shapeBtns = btns;
    return btns.concat([ctx.button("Calm the sky", { w: 0.075, h: 0.026, fontSize: 22, onClick: () => { for (const v of sn.userVortices) { v.held = false; v.strength = 0.01; } } })]);
  },
  setShape(ctx, i) {
    const sn = this.sn, app = ctx.app;
    setImmersive(app, i === 0);
    if (i > 0 && sn.shape.target === 0) {                  // bring the volume to arm's length
      const head = headPos(app, new ctx.THREE.Vector3()), dir = new ctx.THREE.Vector3();
      app.camera.getWorldDirection(dir); dir.y = 0; dir.normalize();
      sn.placeVolume(head.x + dir.x * 0.85, Math.max(0.8, head.y - 0.2), head.z + dir.z * 0.85, 0.45);
      this.proxy.position.copy(sn.dabUniforms.uVolCenter.value);
      this.proxy.scale.setScalar(0.45);
    }
    sn.setShape(i);
    if (this.shapeBtns) this.shapeBtns.forEach((b, k) => b.setValue(k === i));
  },
  update(dt, t, ctx) {
    const app = ctx.app, sn = this.sn;
    this.time += Math.min(dt, 0.05); t = this.time;
    sn.shared.uTime.value = t;
    // the volume modes: the painting sits on a handle you can carry and scale
    const vol = sn.shape.target > 0 || sn.shape.animating;
    this.proxy.visible = vol;
    if (vol) {
      const held = this.proxyIt.selections.length > 0;
      sn.shape.held = held;
      const r = Math.min(1.4, Math.max(0.16, this.proxy.scale.x));
      this.proxy.scale.setScalar(r);
      sn.dabUniforms.uVolR.value = r;
      sn.dabUniforms.uVolCenter.value.copy(this.proxy.position);
    } else sn.shape.held = false;
    sn.updateShape(dt);
    sn.updateFrames(t, artAlpha(app));
    ownSky(app, sn.shape.target === 0 && !sn.shape.animating);
    freeSelects(app, (src) => {
      if (src.kind === "controller") {
        const sq = src.squeeze > 0.5;
        if (sq && !this.sq.get(src)) this.sign.set(src, -(this.sign.get(src) || 1));
        this.sq.set(src, sq);
      }
      const sign = src.kind === "controller" ? (this.sign.get(src) || 1) : src.handedness === "left" ? -1 : 1;
      return sn.beginVortex(sn.aimAxis(src.ray.origin, src.ray.dir), sign);
    }, (src, v) => {
      v.dir.copy(sn.aimAxis(src.ray.origin, src.ray.dir));
      if (src.kind === "controller") {
        const sq = src.squeeze > 0.5;
        if (sq && !this.sq.get(src)) { const s = -(this.sign.get(src) || 1); this.sign.set(src, s); v.sign = s; }
        this.sq.set(src, sq);
      }
    }, (src, v) => { v.held = false; }, this.held);
    sn.updateVortices(dt, t);
  },
  exit(ctx) { exitArtWorld(this, ctx); this.held.clear(); this.shapeBtns = null; }
};

// ---------------------------------------------------------------------------
// Impression, Sunrise. Pinch / trigger at the water to pull a wake through it.
// ---------------------------------------------------------------------------
var MonetSunrise = {
  id: "impression-sunrise",
  title: "Impression, Sunrise",
  init(ctx) {
    const { root, THREE: T, app } = ctx;
    enterArtWorld(this, ctx);
    this.mn = buildMonet(T, root, app);
    this.mn.onMode(() => { this.syncButtons(); this.syncHandle(); });
    this.applyVST(ctx);
    // the handle: a tray just under the widget. Drag it to carry the painting,
    // two hands to scale and turn it — the same grab as anything else in the
    // framework. Pinching inside the glass stirs the paint instead.
    const handle = new T.Mesh(new T.TorusGeometry(1, 0.08, 10, 40).rotateX(Math.PI / 2), new T.MeshBasicMaterial({ transparent: true, opacity: 0, depthWrite: false }));
    handle.name = "painting"; handle.userData.noHighlight = true;
    root.add(handle);
    this.handleIt = ctx.add(handle, { draggable: true, twoHand: true });
    this.handle = handle;
    this.handleIt.on("hoverenter", () => { this.hot = true; });
    this.handleIt.on("hoverexit", () => { this.hot = false; });
    this._y = new T.Vector3(0, 1, 0);
    this._p = new T.Vector3();
    this.syncHandle();
    ctx.log(`Impression, Sunrise: ${this.mn.N.toLocaleString()} strokes`);
  },
  // Globe and Cube are widgets you hold in your room; Immersive puts you in the
  // painting, so it takes the background with it
  applyVST(ctx) { setImmersive(ctx.app, !this.mn.isWidget()); },
  menuItems(ctx) {
    const mn = this.mn;
    const b = (label, isActive, onClick) => ctx.button(label, { w: 0.075, h: 0.026, fontSize: 22, toggle: true, value: isActive(), onClick });
    this.btns = [
      b("Globe", () => mn.mode === "globe", () => { mn.setMode("globe"); this.applyVST(ctx); }),
      b("Cube", () => mn.mode === "cube", () => { mn.setMode("cube"); this.applyVST(ctx); }),
      b("Immersive", () => mn.mode === "immersive", () => { mn.setMode("immersive"); this.applyVST(ctx); }),
      b("Whirl", () => mn.FX.pinch === "whirl", () => mn.setPinch("whirl")),
      b("Gather", () => mn.FX.pinch === "gather", () => mn.setPinch("gather")),
      b("Scatter", () => mn.FX.pinch === "scatter", () => mn.setPinch("scatter")),
      b("Speed", () => mn.FX.accelerate, () => mn.toggleFX("accelerate")),
      b("Mist", () => mn.FX.mist, () => mn.toggleFX("mist")),
      b("Sun \u2191", () => mn.FX.sunUp, () => mn.toggleFX("sunUp"))
    ];
    this.btns.push(ctx.button("Recentre", { w: 0.075, h: 0.026, fontSize: 22, onClick: () => mn.recentreGlobe() }));
    this.states = [() => mn.mode === "globe", () => mn.mode === "cube", () => mn.mode === "immersive",
      () => mn.FX.pinch === "whirl", () => mn.FX.pinch === "gather", () => mn.FX.pinch === "scatter",
      () => mn.FX.accelerate, () => mn.FX.mist, () => mn.FX.sunUp];
    return this.btns;
  },
  syncButtons() {
    if (!this.btns || !this.states) return;
    this.states.forEach((f, i) => this.btns[i].setValue(f()));
  },
  // handle ← pose
  syncHandle() {
    const mn = this.mn, p = mn.globePose;
    if (!this.handle) return;
    this.handle.visible = mn.isWidget();
    const s = mn.R * mn.GLOBE_SCALE * p.scale * 1.12;
    this.handle.position.set(p.pos.x, p.pos.y - 0.035 * p.scale, p.pos.z);
    this.handle.scale.setScalar(s);
    this.handle.quaternion.setFromAxisAngle(this._y, p.yaw);
  },
  update(dt, t, ctx) {
    const mn = this.mn, app = ctx.app;
    this.time += Math.min(dt, 0.05);
    const held = this.handleIt.selections.length > 0;
    mn.setHandleHot(held || this.hot);
    if (mn.isWidget() && held) {                       // pose ← handle
      const sc = Math.min(3, Math.max(0.35, this.handle.scale.x / (mn.R * mn.GLOBE_SCALE * 1.12)));
      this._p.copy(this.handle.position); this._p.y += 0.035 * sc;
      const e = new ctx.THREE.Euler().setFromQuaternion(this.handle.quaternion, "YXZ");
      mn.setPose(this._p, sc, e.y);
    } else this.syncHandle();
    mn.update(Math.min(dt, 0.05), this.time);
    ownSky(app, mn.mode === "immersive");
  },
  exit(ctx) { exitArtWorld(this, ctx); this.btns = null; }
};

// ---------------------------------------------------------------------------
// A Thousand Li of Rivers and Mountains. Immersive puts you on the shore;
// Globe and Scroll are the painting held at arm's length, carried by the same
// handle as the others. Pinch to sweep the mist and ruffle the river.
// ---------------------------------------------------------------------------
var QianliJiangshan = {
  id: "qianli-jiangshan",
  title: "Rivers and Mountains",
  init(ctx) {
    const { root, THREE: T, app } = ctx;
    enterArtWorld(this, ctx);
    this.hot=false;
    this.qj = buildQianli(T, root, app);
    this.qj.onMode(() => this.syncButtons());
    this.qj.recentre();
    setImmersive(app, !this.qj.isWidget());
    const handle = new T.Mesh(new T.TorusGeometry(1, 0.08, 10, 40).rotateX(Math.PI / 2), new T.MeshBasicMaterial({ transparent: true, opacity: 0, depthWrite: false }));
    handle.name = "scroll"; handle.userData.noHighlight = true;
    root.add(handle);
    this.handleIt = ctx.add(handle, { draggable: true, twoHand: true });
    this.handle = handle;
    this.handleIt.on("hoverenter", () => { this.hot = true; });
    this.handleIt.on("hoverexit", () => { this.hot = false; });
    this._y = new T.Vector3(0, 1, 0);
    this._p = new T.Vector3();
    this.syncHandle();
    ctx.log(`Rivers and Mountains: ${this.qj.N.toLocaleString()} strokes`);
  },
  menuItems(ctx) {
    const qj = this.qj;
    const b = (label, isActive, onClick) => ctx.button(label, { w: 0.075, h: 0.026, fontSize: 22, toggle: true, value: isActive(), onClick });
    const mode = (m, label) => b(label, () => qj.mode === m, () => {
      qj.setMode(m);
      if (qj.isWidget()) qj.recentre();
      setImmersive(ctx.app, !qj.isWidget());
      this.syncHandle(); this.syncButtons();
    });
    this.btns = [mode("globe", "Globe"), mode("scroll", "Scroll"), mode("immersive", "Immersive")];
    this.states = [() => qj.mode === "globe", () => qj.mode === "scroll", () => qj.mode === "immersive"];
    this.btns.push(ctx.button("Recentre", { w: 0.075, h: 0.026, fontSize: 22, onClick: () => { qj.recentre(); this.syncHandle(); } }));
    return this.btns;
  },
  syncButtons() { if (this.btns && this.states) this.states.forEach((f, i) => this.btns[i].setValue(f())); },
  syncHandle() {
    const qj = this.qj, p = qj.globePose;
    if (!this.handle) return;
    this.handle.visible = qj.isWidget();
    this.handle.position.set(p.pos.x, p.pos.y - 0.035 * p.scale, p.pos.z);
    this.handle.scale.setScalar(qj.handleRadius());
    this.handle.quaternion.setFromAxisAngle(this._y, p.yaw);
  },
  update(dt, t, ctx) {
    const qj = this.qj, app = ctx.app;
    this.time += Math.min(dt, 0.05);
    const held = this.handleIt.selections.length > 0;
    qj.setHandleHot(held || this.hot);
    if (qj.isWidget() && held) {
      const unit = qj.handleRadius() / Math.max(qj.globePose.scale, 1e-3);
      const sc = Math.min(3, Math.max(0.35, this.handle.scale.x / unit));
      this._p.copy(this.handle.position); this._p.y += 0.035 * sc;
      const e = new ctx.THREE.Euler().setFromQuaternion(this.handle.quaternion, "YXZ");
      qj.setPose(this._p, sc, e.y);
    } else this.syncHandle();
    qj.setAlpha(artAlpha(app));
    qj.update(Math.min(dt, 0.05), this.time);
    ownSky(app, qj.mode === "immersive");
  },
  exit(ctx) { exitArtWorld(this, ctx); this.btns = null; }
};

// A head-centred veil works in stereo XR and passthrough as well as desktop.
class GalleryTransition {
  constructor(app) {
    this.app=app;
    this.material=new THREE7.MeshBasicMaterial({color:0x080a0e,side:THREE7.BackSide,transparent:true,opacity:0,depthTest:false,depthWrite:false,toneMapped:false});
    this.mesh=new THREE7.Mesh(new THREE7.SphereGeometry(.5,24,16),this.material);
    this.mesh.renderOrder=10000;this.mesh.frustumCulled=false;this.mesh.visible=false;
    this.mesh.userData.noCollider=true;app.scene.add(this.mesh);
  }
  fade(to,duration) {
    this.finish?.();
    const from=this.material.opacity,start=performance.now();
    this.mesh.visible=true;
    return new Promise(resolve=>{
      const finish=()=>{
        clearTimeout(timer);this.material.opacity=to;this.mesh.visible=to>0;
        this.step=null;this.finish=null;resolve();
      };
      const timer=setTimeout(finish,duration+80);
      this.finish=finish;
      this.step=now=>{
        const t=Math.min(1,(now-start)/duration);
        const ease=t*t*t*(t*(t*6-15)+10);
        this.material.opacity=from+(to-from)*ease;
        if(t===1)finish();
      };
    });
  }
  update(now) {
    this.mesh.position.copy(this.app.input.head);
    this.step?.(now);
  }
}

// One shared context: evolving ambient phrases and dry, crisp interaction feedback.
class GalleryAudio {
  constructor() {
    this.enabled=true;this.active=false;this.world='gallery';this.lastClick=-1;
    this.voices=new Set();this.timer=null;this.phrase=0;this.nextPhrase=0;
  }
  async unlock() {
    if(!this.enabled)return;
    try {
      if(!this.ctx)this.build();
      if(this.ctx.state==='suspended')await this.ctx.resume();
      this.sync();
    } catch(e){console.warn('Audio unavailable; the gallery remains usable.',e.message);}
  }
  build() {
    const AC=window.AudioContext||window.webkitAudioContext;
    if(!AC)throw new Error('Web Audio unavailable');
    const c=this.ctx=new AC();
    this.master=c.createGain();this.master.gain.value=0;
    const limiter=c.createDynamicsCompressor();limiter.threshold.value=-18;limiter.ratio.value=5;
    this.master.connect(limiter);limiter.connect(c.destination);
    this.music=c.createGain();this.music.gain.value=.5;this.music.connect(this.master);
    this.reverb=c.createConvolver();
    const impulse=c.createBuffer(2,Math.round(c.sampleRate*3.6),c.sampleRate);
    for(let ch=0;ch<2;ch++){const d=impulse.getChannelData(ch);for(let i=0;i<d.length;i++)d[i]=(Math.random()*2-1)*Math.pow(1-i/d.length,3)*.24;}
    this.reverb.buffer=impulse;
    const wet=c.createGain();wet.gain.value=.32;this.reverb.connect(wet);wet.connect(this.master);
    this.noise=c.createBuffer(1,Math.round(c.sampleRate*.1),c.sampleRate);
    const noise=this.noise.getChannelData(0);for(let i=0;i<noise.length;i++)noise[i]=Math.random()*2-1;
  }
  audible(){return this.enabled&&this.active&&!document.hidden;}
  sync() {
    if(!this.ctx)return;
    const on=this.audible();this.master.gain.setTargetAtTime(on?.6:0,this.ctx.currentTime,.2);
    if(on&&!this.timer){
      this.nextPhrase=this.ctx.currentTime+.08;
      this.schedule();this.timer=setInterval(()=>this.schedule(),180);
    } else if(!on){
      clearInterval(this.timer);this.timer=null;this.stopVoices();
    }
  }
  setActive(v){this.active=v;this.sync();if(v)void this.unlock();}
  setEnabled(v){this.enabled=v;this.sync();if(v&&this.active)void this.unlock();}
  setWorld(id){
    if(this.world===id)return;
    // Keep the current phrase and its reverb tail; adopt the new texture at the next phrase.
    this.world=id;
  }
  // Finite voices, including scheduled notes, are reclaimed on mute / exit / world change.
  track(source,nodes,end){
    const voice={source,nodes};this.voices.add(voice);
    source.onended=()=>{nodes.forEach(n=>n.disconnect());this.voices.delete(voice);};
    source.stop(end);return voice;
  }
  stopVoices(){
    if(!this.ctx)return;
    const t=this.ctx.currentTime;
    for(const v of this.voices){
      if(v.envelope){v.envelope.cancelScheduledValues(t);v.envelope.setTargetAtTime(.0001,t,.05);}
      try{v.source.stop(t+.25);}catch{}
    }
  }
  note(midi,t,duration,level,pan=0,bright=false){
    const c=this.ctx,o=c.createOscillator(),g=c.createGain(),p=c.createStereoPanner(),f=c.createBiquadFilter();
    o.type=bright?'triangle':'sine';o.frequency.value=440*Math.pow(2,(midi-69)/12);
    o.detune.value=(Math.random()-.5)*5;f.type='lowpass';f.frequency.value=bright?1500:800;
    p.pan.value=pan;
    const attack=bright?.018:1.2;
    g.gain.setValueAtTime(.0001,t);g.gain.exponentialRampToValueAtTime(level,t+attack);
    g.gain.exponentialRampToValueAtTime(.0001,t+duration);
    o.connect(f);f.connect(g);g.connect(p);p.connect(this.music);p.connect(this.reverb);
    o.start(t);this.track(o,[o,f,g,p],t+duration+.05).envelope=g.gain;
  }
  schedule(){
    if(!this.audible()||this.ctx.state!=='running')return;
    const now=this.ctx.currentTime;if(this.nextPhrase<now-.5)this.nextPhrase=now+.08;
    if(this.nextPhrase>now+.3)return;
    const settings={
      gallery:[45,1], 'starry-night':[45,.85], 'impression-sunrise':[45,1.1],
      'qianli-jiangshan':[45,.95], 'living-ink':[45,.8]
    };
    const [root,pace]=settings[this.world]||settings.gallery;
    const chords=[[0,7,14,16],[5,12,16,21],[9,16,19,26],[2,9,14,21],[0,12,16,23],[7,14,21,26]];
    const chord=chords[this.phrase%chords.length],t=this.nextPhrase,length=(9+Math.random()*3)/pace;
    chord.forEach((n,i)=>this.note(root+n,t+i*.18,length+2,i===0?.065:.027,(i-1.5)*.35));
    // Pentatonic fragments leave deliberate gaps, rather than a repeating arpeggio.
    const scale=[0,2,4,7,9,12],count=this.phrase%3===2?2:4;
    for(let i=0;i<count;i++){
      const degree=scale[(this.phrase*2+i*2+Math.floor(Math.random()*3))%scale.length];
      this.note(root+24+degree,t+1.5+i*(length-3)/count+Math.random()*.5,2.5+Math.random()*2,.018+Math.random()*.012,(Math.random()-.5)*1.3,true);
    }
    this.phrase++;this.nextPhrase+=length;
  }
  click(kind='tap'){
    if(!this.ctx||!this.audible()||this.ctx.state!=='running')return;
    const c=this.ctx,t=c.currentTime;if(t-this.lastClick<.065)return;this.lastClick=t;
    // Framework v0.8.22 finger snap: noise crack, bright edge and short low thump.
    const level=kind==='ink'?.12:.22;
    const burst=(type,freq,q,amp,duration)=>{
      const src=c.createBufferSource(),f=c.createBiquadFilter(),g=c.createGain();
      src.buffer=this.noise;f.type=type;f.frequency.value=freq;f.Q.value=q;
      g.gain.setValueAtTime(amp,t);g.gain.exponentialRampToValueAtTime(.0001,t+duration);
      src.connect(f);f.connect(g);g.connect(this.master);src.start(t);this.track(src,[src,f,g],t+duration+.01);
    };
    burst('bandpass',2600,.9,level*1.6,.07);burst('highpass',6000,.707,level*.9,.025);
    const o=c.createOscillator(),g=c.createGain();o.type='sine';
    o.frequency.setValueAtTime(220,t);o.frequency.exponentialRampToValueAtTime(90,t+.06);
    g.gain.setValueAtTime(level*.8,t);g.gain.exponentialRampToValueAtTime(.0001,t+.08);
    o.connect(g);g.connect(this.master);o.start(t);this.track(o,[o,g],t+.09);
  }
  dispose(){
    clearInterval(this.timer);this.timer=null;this.stopVoices();
    for(const v of this.voices)v.nodes.forEach(n=>n.disconnect());
    this.voices.clear();void this.ctx?.close();
  }
}

// Spatial Yellowtail: smoothed centerline, rotation-minimizing frames and guided flight.
class YellowtailStroke {
  constructor(ctx,color,index){
    const T=ctx.THREE;this.T=T;this.ctx=ctx;this.index=index;this.root=new T.Group();this.points=[];this.released=false;this.distance=0;this.age=0;this.expired=false;
    this.geometry=new T.BufferGeometry();this.positions=new Float32Array(180*8*3);this.geometry.setAttribute('position',new T.BufferAttribute(this.positions,3).setUsage(T.DynamicDrawUsage));
    const indices=[];for(let i=0;i<179;i++)for(let j=0;j<8;j++){const a=i*8+j,b=i*8+(j+1)%8;indices.push(a,b,a+8,b,b+8,a+8);}
    this.geometry.setIndex(indices);this.geometry.setDrawRange(0,0);
    this.material=new T.MeshBasicMaterial({color,transparent:true,opacity:1,side:T.DoubleSide,depthWrite:false});
    this.mesh=new T.Mesh(this.geometry,this.material);this.mesh.frustumCulled=false;this.root.add(this.mesh);
    this.tangent=new T.Vector3();this.side=new T.Vector3();this.up=new T.Vector3();
    this.seedSide=null;this.seedTangent=null;this.spin=new T.Quaternion();this.renderPoints=[];
    this.smoothA=Array.from({length:180},()=>new T.Vector3());this.smoothB=Array.from({length:180},()=>new T.Vector3());
    this.tangents=Array.from({length:180},()=>new T.Vector3());this.lengths=new Float32Array(180);
    this.steerTangent=new T.Vector3();this.turnQ=new T.Quaternion();this.viewer=new T.Vector3();
  }
  add(p){
    if(this.released||!Number.isFinite(p.x+p.y+p.z))return;
    if(this.points.length&&this.points.at(-1).distanceToSquared(p)<.000064)return;
    this.points.push(p.clone());if(this.points.length>180)this.points.shift();this.render();
  }
  render(){
    const n=this.points.length;if(n<2)return;
    // Two gentle low-pass passes remove tracking corners without rounding away the gesture.
    let pts=this.smoothA,other=this.smoothB;
    for(let i=0;i<n;i++)pts[i].copy(this.points[i]);
    for(let pass=0;pass<2;pass++){
      for(let i=0;i<n;i++){other[i].copy(pts[i]);if(i>0&&i<n-1)other[i].multiplyScalar(.5).addScaledVector(pts[i-1],.25).addScaledVector(pts[i+1],.25);}
      [pts,other]=[other,pts];
    }
    this.renderPoints=pts;const tangents=this.tangents;
    for(let i=0;i<n;i++){
      tangents[i].copy(pts[Math.min(n-1,i+1)]).sub(pts[Math.max(0,i-1)]);
      if(tangents[i].lengthSq()<1e-10){if(i)tangents[i].copy(tangents[i-1]);else tangents[i].set(0,0,-1);}
      tangents[i].normalize();
    }
    // Carry the first frame between updates, then parallel-transport it down the curve.
    if(this.seedSide){
      this.spin.setFromUnitVectors(this.seedTangent,tangents[0]);this.side.copy(this.seedSide).applyQuaternion(this.spin);
    }else{
      this.side.set(1,0,0);if(Math.abs(tangents[0].x)>.85)this.side.set(0,0,1);
    }
    this.side.addScaledVector(tangents[0],-this.side.dot(tangents[0])).normalize();
    if(!this.seedSide){this.seedSide=new this.T.Vector3();this.seedTangent=new this.T.Vector3();}this.seedSide.copy(this.side);this.seedTangent.copy(tangents[0]);
    let arc=0;const lengths=this.lengths;lengths[0]=0;for(let i=1;i<n;i++){arc+=pts[i].distanceTo(pts[i-1]);lengths[i]=arc;}
    for(let i=0;i<n;i++){
      if(i){this.spin.setFromUnitVectors(tangents[i-1],tangents[i]);this.side.applyQuaternion(this.spin);}
      this.tangent.copy(tangents[i]);this.side.addScaledVector(this.tangent,-this.side.dot(this.tangent)).normalize();
      this.up.crossVectors(this.side,this.tangent).normalize();
      const u=arc?Math.min(1,lengths[i]/arc):i/(n-1),width=.002+.016*Math.pow(Math.sin(Math.PI*u),.7),p=pts[i];
      for(let j=0;j<8;j++){const a=j/8*Math.PI*2,k=(i*8+j)*3;
        const w=Math.cos(a)*width,h=Math.sin(a)*width*.32;
        this.positions[k]=p.x+this.side.x*w+this.up.x*h;
        this.positions[k+1]=p.y+this.side.y*w+this.up.y*h;
        this.positions[k+2]=p.z+this.side.z*w+this.up.z*h;
      }
    }
    this.geometry.setDrawRange(0,(n-1)*48);this.geometry.attributes.position.needsUpdate=true;
  }
  finish(){
    if(this.points.length<3)return false;
    const T=this.T;this.render();this.points=this.renderPoints.slice(0,this.points.length).map(p=>p.clone());
    this.arc=[0];for(let i=1;i<this.points.length;i++)this.arc.push(this.arc.at(-1)+this.points[i].distanceTo(this.points[i-1]));
    this.length=this.arc.at(-1);if(this.length<.025)return false;
    this.released=true;this.head=this.points.at(-1).clone();this.previousHead=this.head.clone();
    this.heading=this.head.clone().sub(this.points[Math.max(0,this.points.length-6)]).normalize();
    if(this.heading.lengthSq()<.001)this.heading.copy(this.tangents[this.points.length-1]);
    this.center=headPos(this.ctx.app,new T.Vector3());
    this.orbitCenter=this.center.clone();this.radial=new T.Vector3();this.desired=new T.Vector3();
    // Replay the recorded spatial gesture by arc length, independent of sampling rate.
    this.gesture=this.points.map(p=>p.clone());this.gestureArc=this.arc.slice();
    this.gestureDrift=this.head.clone().sub(this.points[0]);
    if(this.gestureDrift.length()<.12)this.gestureDrift.copy(this.heading).multiplyScalar(.2);
    else this.gestureDrift.setLength(.2);
    if(this.freeFlight)this.gestureDrift.set(0,0,0);
    this.gestureSteps=[];this.gestureDistances=[0];
    for(let i=1;i<this.gesture.length;i++){
      const delta=this.gesture[i].clone().sub(this.gesture[i-1]).addScaledVector(this.gestureDrift,1/(this.gesture.length-1));
      if(delta.length()<1e-7)continue;
      this.gestureDistances.push(this.gestureDistances.at(-1)+delta.length());this.gestureSteps.push(delta.normalize());
    }
    this.gestureLength=this.gestureDistances.at(-1);
    this.frame=new T.Quaternion();this.lastRadial=this.head.clone().sub(this.center).normalize();
    if(this.lastRadial.lengthSq()<.001)this.lastRadial.set(0,0,-1);
    this.lastTangent=this.heading.clone().addScaledVector(this.lastRadial,-this.heading.dot(this.lastRadial));
    if(this.lastTangent.lengthSq()<.001){this.lastTangent.set(0,1,0).cross(this.lastRadial);if(this.lastTangent.lengthSq()<.001)this.lastTangent.set(1,0,0);}
    this.lastTangent.normalize();
    this.path=this.points.map((p,i)=>({p:p.clone(),s:this.arc[i]}));this.pathDistance=this.length;
    return true;
  }
  recordedVelocity(out){
    const d=this.distance%this.gestureLength,arc=this.gestureDistances;
    let lo=0,hi=arc.length-1;
    while(lo+1<hi){const mid=(lo+hi)>>1;if(arc[mid]<=d)lo=mid;else hi=mid;}
    // Short interpolation around joins removes a hard kick at the cycle seam.
    const segment=arc[lo+1]-arc[lo],u=(d-arc[lo])/segment;
    const next=(lo+1)%this.gestureSteps.length;
    out.copy(this.gestureSteps[lo]);
    const blend=this.T.MathUtils.smoothstep(u,.7,1);
    out.lerp(this.gestureSteps[next],blend);
    if(out.lengthSq()<1e-8)out.copy(this.gestureSteps[lo]);
    return out.normalize();
  }
  cameraPosition(out){
    const app=this.ctx.app,camera=app.renderer?.xr?.isPresenting?app.renderer.xr.getCamera():app.camera;
    return camera?.getWorldPosition?camera.getWorldPosition(out):headPos(app,out);
  }
  steer(step){
    const T=this.T;
    this.cameraPosition(this.center);
    this.orbitCenter.copy(this.center);
    this.radial.copy(this.head).sub(this.orbitCenter);
    const radius=this.radial.length();if(radius<.001)this.radial.copy(this.lastRadial);else this.radial.divideScalar(radius);
    // Transport the gesture's coordinate frame with the orbit, preserving its local turns.
    this.spin.setFromUnitVectors(this.lastRadial,this.radial);this.frame.premultiply(this.spin).normalize();
    this.lastTangent.applyQuaternion(this.spin);this.lastRadial.copy(this.radial);
    this.recordedVelocity(this.desired).applyQuaternion(this.frame);
    const vr=this.desired.dot(this.radial);
    // v_t = v - dot(v,r)r. Preserve the drawn tangential motion, not an invented orbit direction.
    const constraint=T.MathUtils.smoothstep(radius,2.3,2.95);
    this.desired.addScaledVector(this.radial,-vr*constraint);
    this.steerTangent.copy(this.desired).addScaledVector(this.radial,-this.desired.dot(this.radial));
    if(this.steerTangent.lengthSq()>.0025)this.lastTangent.copy(this.steerTangent).normalize();
    // Only nearly radial marks need a small continuity fallback; no random vertical wave.
    if(constraint>.9&&this.steerTangent.lengthSq()<.0025)this.desired.addScaledVector(this.lastTangent,.05);
    const correction=T.MathUtils.clamp((3-radius)*.45,-.5,.5);
    this.desired.addScaledVector(this.radial,correction);
    if(this.desired.lengthSq()>.000001)this.heading.copy(this.desired).normalize();
  }
  advance(step){
    this.previousHead.copy(this.head);this.steer(step);this.head.addScaledVector(this.heading,step);
    this.distance+=step;this.pathDistance+=step;this.path.push({p:this.head.clone(),s:this.pathDistance});
    const tail=this.pathDistance-this.length;
    while(this.path.length>2&&this.path[1].s<tail)this.path.shift();
    let j=0;
    for(let i=0;i<this.points.length;i++){
      const s=tail+this.arc[i];while(j<this.path.length-2&&this.path[j+1].s<s)j++;
      const a=this.path[j],b=this.path[j+1];this.points[i].lerpVectors(a.p,b.p,this.T.MathUtils.clamp((s-a.s)/(b.s-a.s||1),0,1));
    }
  }
  update(dt,speed,paused){
    if(!this.released||paused||this.expired)return;
    let travel=Math.min(.1,Math.max(0,dt))*Math.max(0,speed)*.65;
    while(travel>1e-8){const step=Math.min(.012,travel);this.advance(step);travel-=step;}
    // Visibility depends on actual camera separation, never cumulative path length.
    this.cameraPosition(this.viewer);this.cameraDistance=Infinity;
    for(const p of this.points)this.cameraDistance=Math.min(this.cameraDistance,p.distanceTo(this.viewer));
    const fadeStart=this.fadeStart??5,fadeEnd=this.fadeEnd??7;
    this.expired=this.cameraDistance>=fadeEnd;
    this.material.opacity=1-this.T.MathUtils.smoothstep(this.cameraDistance,fadeStart,fadeEnd);this.render();
  }
  dispose(){this.root.removeFromParent();this.geometry.dispose();this.material.dispose();}
}

var LivingInk={
  id:'living-ink',title:'Living Ink',
  init(ctx){
    const {root,THREE:T,app}=ctx;enterArtWorld(this,ctx);setImmersive(app,false);
    this.environment=new T.Group();root.add(this.environment);
    this.strokes=[];this.held=new Map();this.speed=1;this.paused=false;this.palette=['#f4ef34','#76a4ee','#f4f0e4','#c48ce6','#6ee7d2'];this.nextColor=0;
    const dome=new T.Mesh(new T.SphereGeometry(38,32,16),new T.MeshBasicMaterial({color:0x171d2f,side:T.BackSide}));this.environment.add(dome);
    const floor=new T.Mesh(new T.CircleGeometry(14,64),new T.MeshBasicMaterial({color:0x111629}));floor.rotation.x=-Math.PI/2;floor.position.y=-1.05;this.environment.add(floor);
    const rings=new T.Group();for(let i=1;i<=6;i++){const r=new T.Mesh(new T.RingGeometry(i*1.1,i*1.1+.006,96),new T.MeshBasicMaterial({color:i%2?0x76a4ee:0xf4ef34,transparent:true,opacity:.1,side:T.DoubleSide}));r.rotation.x=-Math.PI/2;r.position.y=-1.045;rings.add(r);}this.environment.add(rings);
    const head=headPos(app,new T.Vector3()),q=app.renderer.xr.isPresenting?app.renderer.xr.getCamera().quaternion:app.camera.quaternion;
    const f=new T.Vector3(0,0,-1).applyQuaternion(q);f.y=0;if(f.lengthSq()<.01)f.set(0,0,-1);f.normalize();
    this.title=ctx.label('SPATIAL YELLOWTAIL',{height:.052,color:'#f4ef34'});this.title.position.copy(head).addScaledVector(f,1.45);this.title.position.y+=.64;this.title.quaternion.copy(q);root.add(this.title);
    this.hint=ctx.label('Pinch or hold the trigger to draw in space. Release to send it flowing around you.',{height:.017,color:'#f4f0e4'});this.hint.position.copy(head).addScaledVector(f,1.44);this.hint.position.y+=.54;this.hint.quaternion.copy(q);root.add(this.hint);
    this.syncEnvironment(app);
  },
  syncEnvironment(app){
    // In AR the framework backdrop controls room visibility via the hand menu.
    this.environment.visible=app.sessionMode!=='ar';
    if(this.environment.visible)ownSky(app,true);
  },
  pointFor(ctx,src,stroke){
    const T=ctx.THREE;
    if(src.kind==='hand'&&src.nearPoint)return src.nearPoint.clone();
    const depth=stroke?.depth||.72;
    if(src.ray?.valid)return src.ray.origin.clone().addScaledVector(src.ray.dir,depth);
    return headPos(ctx.app,new T.Vector3()).add(new T.Vector3(0,0,-depth));
  },
  begin(ctx,src){
    if(this.strokes.length>=12){const i=this.strokes.findIndex(s=>s.released);if(i<0)return null;this.strokes.splice(i,1)[0].dispose();}
    const stroke=new YellowtailStroke(ctx,this.palette[this.nextColor++%this.palette.length],this.nextColor);
    stroke.depth=src.kind==='hand' ? .16 : .72;ctx.root.add(stroke.root);stroke.add(this.pointFor(ctx,src,stroke));this.strokes.push(stroke);return stroke;
  },
  finish(src,stroke){if(!stroke.finish()){const i=this.strokes.indexOf(stroke);if(i>=0)this.strokes.splice(i,1);stroke.dispose();}},
  clear(){for(const stroke of this.strokes)stroke.dispose();this.strokes=[];this.held?.clear();},
  addDemo(ctx){
    if(!ctx||this.strokes.length>=12)return;const T=ctx.THREE,stroke=new YellowtailStroke(ctx,this.palette[this.nextColor++%this.palette.length],this.nextColor);
    const head=headPos(ctx.app,new T.Vector3());for(let i=0;i<92;i++){const a=i/91*Math.PI*2;stroke.add(new T.Vector3(Math.cos(a)*.42,Math.sin(a*2)*.16,Math.sin(a)*.28).add(head).add(new T.Vector3(0,0,-1)));}
    ctx.root.add(stroke.root);stroke.finish();this.strokes.push(stroke);
  },
  menuItems(ctx){
    const b=(label,fn)=>ctx.button(label,{w:.075,h:.026,fontSize:21,onClick:fn});
    return [b('Slower',()=>this.speed=Math.max(.25,this.speed*.75)),b('Faster',()=>this.speed=Math.min(3,this.speed*1.3)),ctx.button('Pause',{w:.075,h:.026,fontSize:21,toggle:true,value:false,onClick:v=>this.paused=v}),b('Clear',()=>this.clear())];
  },
  update(dt,t,ctx){
    freeSelects(ctx.app,src=>this.begin(ctx,src),(src,stroke)=>stroke.add(this.pointFor(ctx,src,stroke)),(src,stroke)=>this.finish(src,stroke),this.held);
    for(const stroke of this.strokes)stroke.update(dt,this.speed,this.paused);
    this.strokes=this.strokes.filter(stroke=>{if(!stroke.expired)return true;stroke.dispose();return false;});this.syncEnvironment(ctx.app);
  },
  exit(ctx){this.clear();exitArtWorld(this,ctx);this.title=this.hint=this.environment=null;}
};

// src/main.js
var VERSION = "0.8.22";
var App = class {
  constructor() {
    if (window.__HAND_L) setHandAssetsBase64(window.__HAND_L, window.__HAND_R);
    else if (window.__HAND_URL) loadHandAssets(window.__HAND_URL).catch((e) => this.log(`hand mesh unavailable (${e.message}) - joints only`));
    this.renderer = new THREE7.WebGLRenderer({ antialias: true, alpha: true });
    this.renderer.setPixelRatio(Math.min(2, window.devicePixelRatio));
    this.renderer.setSize(innerWidth, innerHeight);
    this.renderer.xr.enabled = true;
    this.renderer.xr.setReferenceSpaceType("local-floor");
    document.body.appendChild(this.renderer.domElement);
    this.scene = new THREE7.Scene();
    this.bg = new THREE7.Color(725024);
    this.scene.background = this.bg;
    this.camera = new THREE7.PerspectiveCamera(70, innerWidth / innerHeight, 0.05, 2e3);
    this.camera.position.set(0, 1.95, 0.7);
    this.controls = new OrbitControls(this.camera, this.renderer.domElement);
    this.controls.target.set(0, 1.6, -0.5);
    this.controls.mouseButtons = { LEFT: null, MIDDLE: THREE7.MOUSE.DOLLY, RIGHT: THREE7.MOUSE.ROTATE };
    this.controls.update();
    this.input = new InputSystem();
    this.im = new InteractionManager();
    this.visuals = /* @__PURE__ */ new Map();
    this.rings = new LongPressRings(this.scene);
    this.logPanel = new LogPanel();
    this.menu = new HandMenu(this);
    this.worlds = new WorldManager(this);
    this.audio = new GalleryAudio();
    this.transition = new GalleryTransition(this);
    document.addEventListener("visibilitychange",()=>{this.audio.sync(); if(!document.hidden && this.audio.active) void this.audio.unlock();});
    window.addEventListener("pagehide",()=>this.audio.setActive(false));
    this.sessionMode = null;
    this.settings = { handMesh: true, handJoints: false, ray: true };
    this.vst = { supported: false, opacity: 0, target: 0, last: 0.85 };
    this.backdrop = new THREE7.Mesh(
      new THREE7.SphereGeometry(1400, 32, 16),
      new THREE7.MeshBasicMaterial({ color: 725024, side: THREE7.BackSide, transparent: true, opacity: 0, depthWrite: false, fog: false })
    );
    this.backdrop.renderOrder = -100;
    this.backdrop.visible = false;
    this.backdrop.userData.noCollider = true;
    this.scene.add(this.backdrop);
    this.events = [];
    this.input.onAdd = (s) => this._addSource(s);
    this.input.onRemove = (s) => this._removeSource(s);
    this.mouse = new MouseSource(this.camera, this.renderer.domElement);
    this._addSource(this.mouse);
    Interactable.onAny = (e) => this._onEvent(e);
    this._buildMenu();
    this.worlds.register(Playground);
    this.worlds.register(Gallery);
    this.worlds.register(StarryNight);
    this.worlds.register(MonetSunrise);
    this.worlds.register(QianliJiangshan);
    this.worlds.register(LivingInk);
    addEventListener("resize", () => {
      if (this.renderer.xr.isPresenting) return;
      this.camera.aspect = innerWidth / innerHeight;
      this.camera.updateProjectionMatrix();
      this.renderer.setSize(innerWidth, innerHeight);
    });
    this.last = performance.now();
    this.renderer.setAnimationLoop((t, f) => this._loop(t, f));
  }
  // - sources -
  _addSource(s) {
    const g = this.im.addSource(s);
    const device = s.kind === "hand" ? new HandVisual(s, this.scene, { showMesh: this.settings.handMesh, showJoints: this.settings.handJoints }) : s.kind === "controller" ? new ControllerVisual(s, this.scene) : null;
    const iv = new InteractorVisual(g, this.scene);
    iv.showRay = this.settings.ray;
    this.visuals.set(s, { device, iv });
    if (s.kind !== "mouse") this.log(`+ ${s.kind} ${s.handedness}`);
  }
  _removeSource(s) {
    this.im.removeSource(s);
    const v = this.visuals.get(s);
    v?.device?.dispose();
    v?.iv.dispose();
    this.visuals.delete(s);
    if (this.menu.owner === s) this.menu._close();
    this.log(`- ${s.kind} ${s.handedness}`);
  }
  // - menu -
  _buildMenu() {
    const b = (label, opts) => new UIButton(this.im, label, { w: 0.075, h: 0.026, fontSize: 26, ...opts });
    this.menuButtons = {
      sound: b("Sound", { toggle:true, value:true, onClick:v=>{this.audio.setEnabled(v);syncSoundButton();} }),
      home: b("Home", { onClick: () => this.worlds.load("gallery") }),
      vst: b("VST", { toggle: true, value: true, onClick: (v) => this.setVST(v) }),
      reset: b("Reset world", { onClick: () => this.worlds.reload() }),
      mesh: b("Hand outline", { toggle: true, value: true, onClick: (v) => {
        this.settings.handMesh = v;
        for (const x of this.visuals.values()) if (x.device instanceof HandVisual) x.device.showMesh = v;
      } }),
      joints: b("Joints", { toggle: true, value: false, onClick: (v) => {
        this.settings.handJoints = v;
        for (const x of this.visuals.values()) if (x.device instanceof HandVisual) x.device.showJoints = v;
      } }),
      ray: b("Ray", { toggle: true, value: true, onClick: (v) => {
        this.settings.ray = v;
        for (const x of this.visuals.values()) x.iv.showRay = v;
      } }),
      gain: b("Depth gain", { toggle: true, value: ICFG.farGain.enabled, onClick: (v) => {
        ICFG.farGain.enabled = v;
        this.log(`depth gain ${v ? "on" : "off"}`);
      } }),
      clear: b("Clear log", { onClick: () => this.logPanel.clear() }),
      exit: b("Exit XR", { onClick: () => this.renderer.xr.getSession()?.end() })
    };
    this.opacitySlider = new UISlider(this.im, "Background", { w: 0.15, value: 0, onChange: (v) => this.setOpacity(v) });
    const m = this.menuButtons;
    this.menu.setItems([m.home, m.sound, m.vst, m.gain, m.mesh, m.joints, m.ray, m.reset, m.clear, m.exit], this.opacitySlider);
  }
  // - VST / background opacity -
  setOpacity(v, fromSlider = true) {
    if (!this.vst.supported) v = 1;
    this.vst.target = THREE7.MathUtils.clamp(v, 0, 1);
    if (this.vst.target > 0.02) this.vst.last = this.vst.target;
    this.menuButtons.vst.setValue(this.vst.target < 0.99);
    if (!fromSlider) this.opacitySlider.set(this.vst.target, true);
  }
  setVST(on) {
    if (!this.vst.supported) {
      this.menuButtons.vst.setValue(false);
      this.log("VST not available (VR session)");
      return;
    }
    this.setOpacity(on ? 0 : 1, false);
    this.log(`VST ${on ? "on" : "off"}`);
  }
  _updateBackdrop(dt) {
    const v = this.vst;
    v.opacity += (v.target - v.opacity) * Math.min(1, dt * 8);
    if (Math.abs(v.target - v.opacity) < 2e-3) v.opacity = v.target;
    const inAR = this.sessionMode === "ar";
    this.backdrop.visible = inAR && v.opacity > 1e-3;
    this.backdrop.material.opacity = v.opacity;
    this.backdrop.position.copy(this.input.head);
  }
  // - sessions -
  async enterXR(mode) {
    if(this._entering || this.sessionMode) return;
    this._entering=true;
    document.getElementById("error").hidden=true;
    void this.audio.unlock();
    let pendingSession=null;
    if (!navigator.xr) {this._entering=false;return this.error("WebXR is not available in this browser.");}
    const type = mode === "ar" ? "immersive-ar" : "immersive-vr";
    try {
      const ok = await navigator.xr.isSessionSupported(type);
      if (!ok) return this.error(`${type} is not supported on this device.`);
      const session = pendingSession = await navigator.xr.requestSession(type, {
        optionalFeatures: ["local-floor", "hand-tracking", "bounded-floor"]
      });
      const feats = session.enabledFeatures;
      let floor = feats ? feats.includes("local-floor") : true;
      this.sessionMode = mode;
      this.vst.supported = mode === "ar";
      this.scene.background = mode === "ar" ? null : this.bg;
      this.renderer.setClearColor(0, mode === "ar" ? 0 : 1);
      session.addEventListener("end", () => this._onSessionEnd());
      this.renderer.xr.setReferenceSpaceType(floor ? "local-floor" : "local");
      try {
        await this.renderer.xr.setSession(session);
      } catch (e) {
        if (!floor) throw e;
        floor = false;
        this.renderer.xr.setReferenceSpaceType("local");
        await this.renderer.xr.setSession(session);
      }
      if (!floor) {
        const base = this.renderer.xr.getReferenceSpace();
        this.renderer.xr.setReferenceSpace(base.getOffsetReferenceSpace(new XRRigidTransform({ x: 0, y: -1.6, z: 0 })));
        this._checkFloor = true;
        this.log("local-floor unavailable \u2192 using local + 1.6 m");
      }
      try {
        this.renderer.xr.setFoveation(1);
      } catch (_) {
      }
      this.audio.setActive(true);
      session.addEventListener("visibilitychange",()=>this.audio.setActive(session.visibilityState==="visible"));
      this.mouse.tracked = false;
      this.im.group(this.mouse).blocked = true;
      if (mode === "ar") this.setOpacity(0, false);
      else this.setOpacity(1, false);
      this.menuButtons.vst.setLabel(mode === "ar" ? "VST" : "VST n/a");
      overlay.hide();
      this.log(`session ${type}`);
      await this.worlds.reload();
      this._calibrate = 10; // rebuild once the real head pose is known (table height calibration)
    } catch (e) {
      this.audio.setActive(false);
      if(pendingSession) await pendingSession.end().catch(()=>{});
      this.error(`Could not start ${type}: ${e.message}`);
    } finally { this._entering=false; }
  }
  _onSessionEnd() {
    this.audio.setActive(false);
    this._calibrate=0;
    this.input.clear();
    this.sessionMode = null;
    this.vst.supported = false;
    this.backdrop.visible = false;
    this.scene.background = this.bg;
    this.renderer.setClearColor(0, 1);
    this.im.group(this.mouse).blocked = false;
    overlay.show();
    this.log("session ended");
    this.worlds.reload();
  }
  // - loop -
  _loop(t, frame) {
    const now = performance.now();
    const dt = Math.min(1 / 30, (now - this.last) / 1e3);
    this.last = now;
    if (frame) {
      this.input.update(frame, this.renderer.xr.getReferenceSpace(), now);
      if (this._calibrate && frame.getViewerPose(this.renderer.xr.getReferenceSpace()) && --this._calibrate <= 0) {
        this._calibrate = 0;
        this.worlds.reload(); // playground re-reads the head height -> table = head - TABLE_BELOW_HEAD
      }
      if (this._checkFloor && this.input.head.lengthSq() > 0) {
        this._checkFloor = false;
        if (this.input.head.y < 0.5) {
          const base = this.renderer.xr.getReferenceSpace();
          this.renderer.xr.setReferenceSpace(base.getOffsetReferenceSpace(new XRRigidTransform({ x: 0, y: 3.2, z: 0 })));
        }
      }
    } else {
      this.mouse.update(now);
      this.input.head.copy(this.camera.position);
      this.controls.update();
    }
    this._updateBackdrop(dt);
    this.menu.update(dt, now);
    if(!this.worlds._loading)this.im.update(dt, now, this.input.head);
    for (const v of this.visuals.values()) {
      v.device?.update();
      v.iv.update(this.input.head, dt); if(this.worlds._loading)v.iv.root.visible=false;
    }
    this.rings.update(this.im.longPressProgress(), this.input.head);
    this.worlds.update(dt, now / 1e3);
    this.logPanel.update(now);
    this.transition.update(now);
    this.renderer.render(this.scene, this.camera);
  }
  // - logging -
  _onEvent(e) {
    if(e.type === "press" && e.interactor?.source.kind !== "hand") this.audio.click();
    if (e.type === "statechange" || e.type === "drag") return;
    const i = e.interactor;
    const src = i ? `${i.type}/${i.source.kind === "hand" ? "hand" : i.source.kind === "controller" ? "ctrl" : i.source.kind === "pointer" ? "ptr" : "mouse"}-${i.source.handedness[0]}` : "";
    const name = e.target.object.name || "object";
    let extra = "";
    if (e.type === "scale") extra = ` \u00d7${e.ratio.toFixed(2)}`;
    if (e.type === "rotate") extra = ` ${THREE7.MathUtils.radToDeg(e.angle).toFixed(0)}\u00b0`;
    if (e.type === "dragend" && e.peakGain && i?.type === "far") extra = `  gain\u2264${e.peakGain.toFixed(1)} d ${e.startDistance.toFixed(1)}\u2192${e.distance.toFixed(1)}m`;
    this.events.push({ type: e.type, name, via: src, t: performance.now() });
    if (this.events.length > 400) this.events.splice(0, 100);
    if (e.type === "scale" || e.type === "rotate") {
      this._lastXform = `${e.type} ${name}${extra}`;
      return;
    }
    if (e.type === "transformend" && this._lastXform) this.log(this._lastXform);
    this.log(`${e.type.padEnd(10)} ${name}  ${src}${e.type === "dragend" ? extra : ""}`);
  }
  log(msg) {
    this.logPanel.push(msg);
    overlay.status(msg);
  }
  error(msg) {
    this.log(`\u26a0 ${msg}`);
    overlay.error(msg);
  }
};
var overlay = (() => {
  const el = document.getElementById("overlay");
  const st = document.getElementById("status");
  const er = document.getElementById("error");
  return {
    hide() {
      el.classList.add("hidden");
    },
    show() {
      el.classList.remove("hidden");
    },
    status(m) {
      if (st) st.textContent = m;
    },
    error(m) {
      if (er) {
        er.textContent = m;
        er.hidden = false;
      }
    }
  };
})();
var app = new App();
window.VXR = { app, THREE: THREE7, ICFG, VERSION, GALLERY_VERSION, dev: { HandVisual, outlineMaterial } };
function syncSoundButton(){const b=document.getElementById('sound');b.setAttribute('aria-pressed',String(app.audio.enabled));b.textContent=app.audio.enabled?'Sound on · ambient & interaction':'Sound off';app.menuButtons.sound.setValue(app.audio.enabled);}
document.getElementById('sound').onclick=()=>{app.audio.setEnabled(!app.audio.enabled);syncSoundButton();};
document.getElementById("ver").textContent = `Gallery v${GALLERY_VERSION}`;
app.onWorldChanged = (w,c)=>{setWorldMenu(app,w,c);app.audio.setWorld(w.id);};
await app.worlds.load("gallery");
var arBtn = document.getElementById("enter-ar");
arBtn.onclick = () => app.enterXR(app.preferredXRMode || "vr");
(async () => {
  if (!navigator.xr) {
    arBtn.disabled = true;
    overlay.status("Open this page in a WebXR-compatible headset browser.");
    return;
  }
  const [vr, ar] = await Promise.all(["immersive-vr", "immersive-ar"].map((m) => navigator.xr.isSessionSupported(m).catch(() => false)));
  app.preferredXRMode = ar ? "ar" : vr ? "vr" : null;
  arBtn.disabled = !app.preferredXRMode;
  overlay.status(app.preferredXRMode ? "Ready. Put on your headset and enter the gallery." : "No immersive session is available in this browser.");
})();

if(new URLSearchParams(location.search).get('qa')==='1'){
 const panel=document.createElement('div');panel.id='qa';panel.style='position:fixed;bottom:8px;left:8px;z-index:20;display:flex;gap:6px;flex-wrap:wrap;max-width:95vw';
 const add=(name,fn)=>{const b=document.createElement('button');b.textContent=name;b.style='font-size:11px;padding:8px 12px';b.onclick=fn;panel.append(b);};
 add('Cover',()=>overlay.show());add('Gallery',()=>{overlay.hide();void app.worlds.load('gallery');});
 ART.forEach(a=>add(a.title,()=>{overlay.hide();void app.worlds.load(a.id);}));
 for(const mode of ['scroll','globe','immersive'])add(mode,()=>{if(app.worlds.current?.qj)app.worlds.current.qj.setMode(mode);});
 add('Stroke test',()=>app.worlds.current?.addDemo?.(app.worlds.ctx));
 add('Clear',()=>app.worlds.current?.clear?.());
 add('Audio test',()=>{app.audio.setActive(!app.audio.active);app.audio.click();});
 const stats=document.createElement('output');stats.id='qa-stats';stats.style='font:10px monospace;color:white;align-self:center';panel.append(stats);
 setInterval(()=>{stats.textContent=JSON.stringify({world:app.worlds.current?.id,geometries:app.renderer.info.memory.geometries,textures:app.renderer.info.memory.textures,draws:app.renderer.info.render.calls,strokes:app.worlds.current?.strokes?.length,audio:app.audio.ctx?.state,points:app.worlds.current?.strokes?.reduce((n,s)=>n+s.points.length,0),failed:!!app.worlds._failed});},1000);
 document.body.append(panel);
}

// Landing spiral artwork: every dab is a live brush stroke that answers the cursor.
// Hover stirs the paint along with you and whirls it in your wake, a quick flick
// scatters it, press-and-hold gathers it into a whirlpool (release lets it bloom out).
// Left alone, the whole spiral turns slowly, like a galaxy seen at a tilt.
(() => {
  const host = document.querySelector('.artwork');
  const svg = host && host.querySelector('svg');
  if (!svg) return;
  const reduce = matchMedia('(prefers-reduced-motion: reduce)').matches;
  const [vbX, vbY, vbW, vbH] = svg.getAttribute('viewBox').trim().split(/[\s,]+/).map(Number);
  const paths = svg.querySelectorAll('path');
  const N = paths.length;
  if (!N) return;
  const F = () => new Float32Array(N);
  const hx = F(), hy = F(), a0 = F(), len = F(), wid = F(), ph = F();
  const u0 = F(), w0 = F(), du0 = F(), dw0 = F(), r0 = F();
  const x = F(), y = F(), vx = F(), vy = F(), ang = F(), glow = F(), rel = F();
  const col = new Array(N), key = new Uint16Array(N);
  const keyStyle = [], keyWidth = [], keyMap = new Map();
  const q = (v) => Math.min(255, Math.round(v / 24) * 24);
  let cx = 0, cy = 0;
  for (let i = 0; i < N; i++) {
    const p = paths[i];
    const m = /M\s*([-\d.]+)[\s,]+([-\d.]+)\s*l\s*([-\d.]+)[\s,]+([-\d.]+)/.exec(p.getAttribute('d') || '') || [0, 0, 0, 0, 0];
    const dx = +m[3], dy = +m[4];
    hx[i] = x[i] = +m[1] + dx / 2; hy[i] = y[i] = +m[2] + dy / 2;
    a0[i] = ang[i] = Math.atan2(dy, dx); len[i] = Math.hypot(dx, dy);
    wid[i] = +(p.getAttribute('stroke-width') || 1);
    const c = col[i] = p.getAttribute('stroke') || '#ffffff';
    ph[i] = Math.random() * 6.283;
    cx += hx[i]; cy += hy[i];
    // resting strokes are drawn in batches: quantised colour + width
    const r = q(parseInt(c.slice(1, 3), 16)), g = q(parseInt(c.slice(3, 5), 16)), b = q(parseInt(c.slice(5, 7), 16));
    const wl = Math.max(1, Math.round(wid[i] * 2)) / 2, k = r + ',' + g + ',' + b + '|' + wl;
    if (!keyMap.has(k)) { keyMap.set(k, keyStyle.length); keyStyle.push('rgb(' + r + ',' + g + ',' + b + ')'); keyWidth.push(wl); }
    key[i] = keyMap.get(k);
  }
  cx /= N; cy /= N;
  // the spiral is a flattened disc: work in its round frame (y stretched by 1/k)
  let sxx = 0, syy = 0;
  for (let i = 0; i < N; i++) { sxx += (hx[i] - cx) ** 2; syy += (hy[i] - cy) ** 2; }
  const k = Math.sqrt(syy / sxx) || 1;
  let rmax = 1, wind = 0;
  for (let i = 0; i < N; i++) {
    const u = u0[i] = hx[i] - cx, w = w0[i] = (hy[i] - cy) / k;
    let du = Math.cos(a0[i]), dw = Math.sin(a0[i]) / k; const dl = Math.hypot(du, dw) || 1; du /= dl; dw /= dl;
    du0[i] = du; dw0[i] = dw;
    const r = r0[i] = Math.hypot(u, w) || 1; rmax = Math.max(rmax, r);
    wind += ((du * u + dw * w) / r) * ((dw * u - du * w) / r);
  }
  for (let i = 0; i < N; i++) r0[i] /= rmax;
  const OMEGA = -Math.sign(wind || 1) * (2 * Math.PI / 140);  // one slow turn every ~2 min, arms trailing
  let theta = 0, primed = false;
  const order = Array.from({ length: N }, (_, i) => i).sort((a, b) => key[a] - key[b]);

  const cv = document.createElement('canvas');
  const ctx = cv.getContext('2d');
  if (!ctx) return;
  host.insertBefore(cv, svg);
  host.classList.add('live');

  let W = 0, H = 0, dpr = 1, s = 1, ox = 0, oy = 0, BASE = 0.32;
  const small = matchMedia('(max-width:700px)');
  function fit() {
    const r = host.getBoundingClientRect();
    dpr = Math.min(2, window.devicePixelRatio || 1);
    W = r.width; H = r.height;
    cv.width = Math.max(1, Math.round(W * dpr)); cv.height = Math.max(1, Math.round(H * dpr));
    s = Math.min(W / vbW, H / vbH) || 1;                 // same "meet" fit as the SVG,
    if (H > W) s = Math.max(s, Math.min(H * 0.42 / vbH, W * 1.8 / vbW));   // but bleeding wider on a portrait screen
    ox = (W - vbW * s) / 2 - vbX * s; oy = (H - vbH * s) / 2 - vbY * s;
    BASE = small.matches ? 0.26 : 0.34;
  }

  // ── the cursor ─────────────────────────────────────────────────────────
  const P = { x: 1e9, y: 1e9, vx: 0, vy: 0, t: 0, in: false, down: false, downAt: 0, burst: 0, bx: 0, by: 0 };
  const overlayEl = document.getElementById('overlay');
  const active = () => !overlayEl || !overlayEl.classList.contains('hidden');
  const toVB = (e) => { const r = host.getBoundingClientRect(); return [(e.clientX - r.left - ox) / s, (e.clientY - r.top - oy) / s]; };
  window.addEventListener('pointermove', (e) => {
    if (!active()) return;
    const [nx, ny] = toVB(e), now = performance.now();
    if (P.in && P.t) {
      const dt = Math.max(0.008, (now - P.t) / 1000), k = Math.min(1, dt * 18);
      P.vx += ((nx - P.x) / dt - P.vx) * k; P.vy += ((ny - P.y) / dt - P.vy) * k;
    } else { P.vx = P.vy = 0; }
    P.x = nx; P.y = ny; P.t = now; P.in = true; wake();
  }, { passive: true });
  document.addEventListener('pointerout', (e) => { if (!e.relatedTarget) P.in = false; }, { passive: true });
  window.addEventListener('pointerdown', (e) => {
    if (!active() || e.button > 0) return;
    if (e.target.closest && e.target.closest('button,a,input,select,textarea,label,[role="button"]')) return;
    const [nx, ny] = toVB(e);
    P.x = nx; P.y = ny; P.vx = P.vy = 0; P.in = true; P.t = performance.now();
    P.down = true; P.downAt = P.t; wake();
  }, { passive: true });
  const release = (e, bloom) => {
    if (P.down && bloom && performance.now() - P.downAt > 160) { P.burst = 1; P.bx = P.x; P.by = P.y; }
    P.down = false;
    if (e.pointerType === 'touch') P.in = false;
  };
  window.addEventListener('pointerup', (e) => release(e, true), { passive: true });
  window.addEventListener('pointercancel', (e) => release(e, false), { passive: true });

  // ── the paint ──────────────────────────────────────────────────────────
  const HALF = Math.PI / 2;
  const wrapH = (d) => { d = (d + HALF) % Math.PI; if (d < 0) d += Math.PI; return d - HALF; };  // strokes have no head/tail
  let energy = 0;
  function step(dt, t) {
    theta += OMEGA * dt;
    const R = Math.min(200, Math.max(45, 110 / s));      // ~110 px of reach on screen
    const G = P.down ? R * 1.7 : R;
    const pvx = P.vx, pvy = P.vy, sp = Math.hypot(pvx, pvy);
    const on = P.in, burst = P.burst, B2 = (R * 1.8) * (R * 1.8);
    P.burst = 0; energy = 0;
    const K = 14, C = 3.4, fade = Math.exp(-dt * 1.6), turn = Math.min(1, dt * 9);
    for (let i = 0; i < N; i++) {
      // where this dab's home has drifted to as the disc turns (inner arms breathe a little)
      const th = theta + 0.06 * Math.sin(t * 0.3 + r0[i] * 2.2) * (1 - r0[i]);
      const c = Math.cos(th), sn = Math.sin(th);
      const nhx = cx + u0[i] * c - w0[i] * sn, nhy = cy + (u0[i] * sn + w0[i] * c) * k;
      const hvx = primed ? (nhx - hx[i]) / dt : 0, hvy = primed ? (nhy - hy[i]) / dt : 0;
      hx[i] = nhx; hy[i] = nhy;
      a0[i] = Math.atan2((du0[i] * sn + dw0[i] * c) * k, du0[i] * c - dw0[i] * sn);
      let kS = K, ax = 0, ay = 0, g = 0;
      if (on) {
        const dx = x[i] - P.x, dy = y[i] - P.y, d2 = dx * dx + dy * dy;
        if (d2 < G * G) {
          const d = Math.sqrt(d2) || 1e-3, ux = dx / d, uy = dy / d;
          if (P.down) {
            // gather: drawn in to a ring round the cursor and drained like a whirlpool
            const f = 1 - d / G, pull = 560 * f * Math.max(-1, Math.min(1, (d - 9) / 16)), sw = 320 * f;
            ax += -ux * pull - uy * sw; ay += -uy * pull + ux * sw;
            kS = K * (1 - 0.92 * f); g = 0.35 + 0.6 * f;
          } else {
            const f = 1 - d / R, f2 = f * f;
            // stir: the paint is dragged along with the cursor
            ax += (pvx - vx[i]) * 7 * f2; ay += (pvy - vy[i]) * 7 * f2;
            // whirl: counter-rotating eddies shed in the wake, plus a slow swirl while you hover
            const w = (pvx * dy - pvy * dx >= 0 ? 1 : -1) * sp * 1.4 * f2 + 55 * f2;
            ax += -uy * w; ay += ux * w;
            // scatter: a quick flick throws the dabs outward
            if (sp > 260) { const sc = (sp - 260) * 2.2 * f; ax += ux * sc; ay += uy * sc; }
            g = f * (0.45 + Math.min(0.55, sp / 420));
          }
        }
      }
      if (burst) {  // release after a gather: the pool blooms back out
        const dx = x[i] - P.bx, dy = y[i] - P.by, d2 = dx * dx + dy * dy;
        if (d2 < B2) { const d = Math.sqrt(d2) || 1e-3, f = 1 - d / (R * 1.8); vx[i] += dx / d * 300 * f; vy[i] += dy / d * 300 * f; }
      }
      ax += (hx[i] - x[i]) * kS - (vx[i] - hvx) * C; ay += (hy[i] - y[i]) * kS - (vy[i] - hvy) * C;
      vx[i] += ax * dt; vy[i] += ay * dt;
      x[i] += vx[i] * dt; y[i] += vy[i] * dt;
      const rx = vx[i] - hvx, ry = vy[i] - hvy, v2 = rx * rx + ry * ry;   // motion relative to the slow turn
      rel[i] = Math.sqrt(v2);
      let target = a0[i];                                  // dabs turn to follow the flow
      if (v2 > 16) target = a0[i] + wrapH(Math.atan2(ry, rx) - a0[i]) * Math.min(1, rel[i] / 140);
      ang[i] += wrapH(target - ang[i]) * turn;
      glow[i] = Math.max(glow[i] * fade, g);
      energy += v2 + glow[i];
    }
    primed = true;
  }

  function seg(i, t, amb) {
    const a = ang[i] + amb * 0.08 * Math.sin(t * 0.7 + ph[i]);
    const px = x[i], py = y[i];
    const L = len[i] * 0.5 * (1 + Math.min(1.6, rel[i] / 150));   // smear when stirred
    const c = Math.cos(a) * L, sn = Math.sin(a) * L;
    ctx.moveTo(px - c, py - sn); ctx.lineTo(px + c, py + sn);
  }
  function draw(t, amb) {
    ctx.setTransform(1, 0, 0, 1, 0, 0);
    ctx.clearRect(0, 0, cv.width, cv.height);
    ctx.setTransform(dpr * s, 0, 0, dpr * s, dpr * ox, dpr * oy);
    ctx.lineCap = 'round';
    ctx.globalAlpha = BASE;
    let cur = -1;
    for (let n = 0; n < N; n++) {                        // resting strokes, batched
      const i = order[n];
      if (glow[i] > 0.04) continue;
      if (key[i] !== cur) {
        if (cur >= 0) ctx.stroke();
        cur = key[i]; ctx.strokeStyle = keyStyle[cur]; ctx.lineWidth = keyWidth[cur]; ctx.beginPath();
      }
      seg(i, t, amb);
    }
    if (cur >= 0) ctx.stroke();
    for (let i = 0; i < N; i++) {                        // stirred strokes light up
      const gl = glow[i];
      if (gl <= 0.04) continue;
      ctx.globalAlpha = BASE + (0.95 - BASE) * Math.min(1, gl);
      ctx.strokeStyle = col[i]; ctx.lineWidth = wid[i] * (1 + 0.5 * gl);
      ctx.beginPath(); seg(i, t, amb); ctx.stroke();
    }
    ctx.globalAlpha = 1;
  }

  let raf = 0, last = 0, frame = 0;
  function tick(now) {
    raf = 0;
    if (!active()) return;                               // woken again when the cover returns
    const dt = Math.min(1 / 30, last ? (now - last) / 1000 : 1 / 60); last = now;
    if (now - P.t > 40) { const k = Math.exp(-dt * 10); P.vx *= k; P.vy *= k; }
    step(dt, now / 1000);
    const r = host.getBoundingClientRect();
    const calm = !P.in && !P.down && energy < 2;
    if (r.bottom > 0 && r.top < innerHeight && !(calm && (frame++ & 1))) draw(now / 1000, 1);
    raf = requestAnimationFrame(tick);
  }
  function wake() { if (!raf && !reduce && active()) { last = 0; primed = false; raf = requestAnimationFrame(tick); } }

  fit();
  if (reduce) draw(0, 0);
  new ResizeObserver(() => { fit(); if (reduce) draw(0, 0); else wake(); }).observe(host);
  if (overlayEl) new MutationObserver(wake).observe(overlayEl, { attributes: true, attributeFilter: ['class'] });
  wake();
})();

export {
  VERSION
};
</script>