wallpaper/index.html at main · Ed-Key/wallpaper · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Coloring Book Sky</title>
  <style>
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html, body { width: 100%; height: 100%; overflow: hidden; background: #1a1040; }
    canvas { display: block; width: 100%; height: 100%; }

    /* Debug panel — toggle with 'D' key */
    #debug-panel {
      display: none; position: fixed; top: 12px; right: 12px; width: 320px;
      background: rgba(10, 10, 25, 0.92); border: 1px solid #333; border-radius: 8px;
      padding: 14px; z-index: 1000; font: 12px/1.6 'SF Mono', 'Menlo', monospace; color: #aaa;
      backdrop-filter: blur(8px); max-height: 90vh; overflow-y: auto;
    }
    #debug-panel.visible { display: block; }
    #debug-panel h3 { color: #ff6b9d; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 12px 0 6px; }
    #debug-panel h3:first-child { margin-top: 0; }
    #debug-panel .row { display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }
    #debug-panel .row label { width: 120px; font-size: 11px; color: #888; }
    #debug-panel .row input[type="range"] { flex: 1; accent-color: #ff6b9d; }
    #debug-panel .row .val { width: 40px; text-align: right; color: #fff; font-size: 11px; }
    #debug-panel .hint { font-size: 10px; color: #555; margin-top: 8px; }
  </style>
</head>
<body>

<!-- Debug panel (press D to toggle) -->
<div id="debug-panel">
  <h3>Vibrancy</h3>
  <div class="row"><label>Saturation</label><input type="range" id="d-vibrance" min="50" max="180" value="117"><span class="val" id="v-vibrance">1.17</span></div>

  <h3>Color Temperature</h3>
  <div class="row"><label>Warm R</label><input type="range" id="d-warmR" min="90" max="115" value="96"><span class="val" id="v-warmR">0.96</span></div>
  <div class="row"><label>Cool R</label><input type="range" id="d-coolR" min="80" max="105" value="89"><span class="val" id="v-coolR">0.89</span></div>
  <div class="row"><label>Warm B</label><input type="range" id="d-warmB" min="75" max="105" value="87"><span class="val" id="v-warmB">0.87</span></div>
  <div class="row"><label>Cool B</label><input type="range" id="d-coolB" min="90" max="120" value="103"><span class="val" id="v-coolB">1.03</span></div>

  <h3>Glow Pulse</h3>
  <div class="row"><label>Max Intensity</label><input type="range" id="d-glowMax" min="0" max="20" value="16"><span class="val" id="v-glowMax">0.16</span></div>
  <div class="row"><label>Center X</label><input type="range" id="d-glowX" min="0" max="100" value="61"><span class="val" id="v-glowX">0.61</span></div>
  <div class="row"><label>Center Y</label><input type="range" id="d-glowY" min="0" max="100" value="62"><span class="val" id="v-glowY">0.62</span></div>
  <div class="row"><label>Spread</label><input type="range" id="d-glowSpread" min="10" max="80" value="52"><span class="val" id="v-glowSpread">5.2</span></div>

  <h3>Noise Color Mod</h3>
  <div class="row"><label>Intensity</label><input type="range" id="d-noiseAmt" min="0" max="10" value="7"><span class="val" id="v-noiseAmt">0.070</span></div>

  <h3>God Rays</h3>
  <div class="row"><label>Intensity</label><input type="range" id="d-rayInt" min="0" max="50" value="29"><span class="val" id="v-rayInt">0.29</span></div>
  <div class="row"><label>Center X</label><input type="range" id="d-rayX" min="0" max="100" value="56"><span class="val" id="v-rayX">0.56</span></div>
  <div class="row"><label>Center Y</label><input type="range" id="d-rayY" min="0" max="100" value="18"><span class="val" id="v-rayY">0.18</span></div>
  <div class="row"><label>Orbit Radius X</label><input type="range" id="d-rayOrbitX" min="0" max="30" value="6"><span class="val" id="v-rayOrbitX">0.06</span></div>
  <div class="row"><label>Orbit Radius Y</label><input type="range" id="d-rayOrbitY" min="0" max="20" value="5"><span class="val" id="v-rayOrbitY">0.05</span></div>

  <h3>Vignette</h3>
  <div class="row"><label>Min Opacity</label><input type="range" id="d-vigMin" min="0" max="30" value="6"><span class="val" id="v-vigMin">0.06</span></div>
  <div class="row"><label>Max Opacity</label><input type="range" id="d-vigMax" min="0" max="40" value="12"><span class="val" id="v-vigMax">0.12</span></div>

  <h3>Cloud Morph</h3>
  <div class="row"><label>Amplitude</label><input type="range" id="d-morphAmp" min="0" max="30" value="16"><span class="val" id="v-morphAmp">0.016</span></div>
  <div class="row"><label>Speed</label><input type="range" id="d-morphSpd" min="1" max="300" value="59"><span class="val" id="v-morphSpd">0.059</span></div>
  <div class="row"><label>Scale</label><input type="range" id="d-morphScl" min="10" max="80" value="30"><span class="val" id="v-morphScl">3.0</span></div>

  <h3>Shooting Stars</h3>
  <div class="row"><label>Brightness</label><input type="range" id="d-ssOpacity" min="0" max="100" value="70"><span class="val" id="v-ssOpacity">0.70</span></div>

  <h3>Star Twinkle</h3>
  <div class="row"><label>Speed Min</label><input type="range" id="d-twinkMin" min="1" max="30" value="5"><span class="val" id="v-twinkMin">0.5</span></div>
  <div class="row"><label>Speed Max</label><input type="range" id="d-twinkMax" min="5" max="50" value="23"><span class="val" id="v-twinkMax">2.3</span></div>

  <div class="hint">Press D to close. Values update live.</div>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script>
// ============================================================
// STAR DETECTION PARAMS (tuned via star-debug.html)
// ============================================================
const STAR_PARAMS = {
  minLuminance: 0.52,
  maxSaturation: 0.63,
  minLocalContrast: 0.03,
  sampleRadius: 20,
  scoreThreshold: 0.35,
  maskPadding: 10,
};

// ============================================================
// HELPERS
// ============================================================
function smoothstep(edge0, edge1, x) {
  const t = Math.max(0, Math.min(1, (x - edge0) / (edge1 - edge0)));
  return t * t * (3 - 2 * t);
}

// ============================================================
// STAR DETECTION → BINARY MASK
// ============================================================
function detectStarMask(img) {
  const W = img.width, H = img.height, N = W * H;
  const canvas = document.createElement('canvas');
  canvas.width = W; canvas.height = H;
  const ctx = canvas.getContext('2d');
  ctx.drawImage(img, 0, 0);
  const imageData = ctx.getImageData(0, 0, W, H);
  const px = imageData.data;

  const { minLuminance, maxSaturation, minLocalContrast, sampleRadius, scoreThreshold, maskPadding } = STAR_PARAMS;
  const r = sampleRadius;

  // Luminance + saturation maps
  const lumMap = new Float32Array(N);
  const satMap = new Float32Array(N);
  for (let i = 0; i < N; i++) {
    const idx = i * 4;
    const rr = px[idx] / 255, gg = px[idx + 1] / 255, bb = px[idx + 2] / 255;
    lumMap[i] = 0.2126 * rr + 0.7152 * gg + 0.0722 * bb;
    const maxC = Math.max(rr, gg, bb), minC = Math.min(rr, gg, bb);
    satMap[i] = maxC > 0 ? (maxC - minC) / maxC : 0;
  }

  // Integral image
  const integral = new Float64Array(N);
  for (let y = 0; y < H; y++) {
    for (let x = 0; x < W; x++) {
      const i = y * W + x;
      integral[i] = lumMap[i]
        + (x > 0 ? integral[i - 1] : 0)
        + (y > 0 ? integral[i - W] : 0)
        - (x > 0 && y > 0 ? integral[i - W - 1] : 0);
    }
  }

  function boxSum(x0, y0, x1, y1) {
    let s = integral[y1 * W + x1];
    if (x0 > 0) s -= integral[y1 * W + x0 - 1];
    if (y0 > 0) s -= integral[(y0 - 1) * W + x1];
    if (x0 > 0 && y0 > 0) s += integral[(y0 - 1) * W + x0 - 1];
    return s;
  }

  // Detect
  const rawMask = new Uint8Array(N);
  const innerR = Math.max(1, Math.floor(r * 0.3));
  for (let y = 0; y < H; y++) {
    for (let x = 0; x < W; x++) {
      const i = y * W + x;
      const lum = lumMap[i];
      const lumScore = smoothstep(minLuminance, minLuminance + 0.2, lum);
      if (lumScore < 0.01) continue;
      const satScore = 1.0 - smoothstep(0.0, maxSaturation, satMap[i]);
      if (satScore < 0.01) continue;
      const ox0 = Math.max(0, x - r), oy0 = Math.max(0, y - r);
      const ox1 = Math.min(W - 1, x + r), oy1 = Math.min(H - 1, y + r);
      const ix0 = Math.max(0, x - innerR), iy0 = Math.max(0, y - innerR);
      const ix1 = Math.min(W - 1, x + innerR), iy1 = Math.min(H - 1, y + innerR);
      const outerSum = boxSum(ox0, oy0, ox1, oy1);
      const innerSum = boxSum(ix0, iy0, ix1, iy1);
      const outerArea = (ox1 - ox0 + 1) * (oy1 - oy0 + 1);
      const innerArea = (ix1 - ix0 + 1) * (iy1 - iy0 + 1);
      const ringAvg = (outerArea - innerArea) > 0 ? (outerSum - innerSum) / (outerArea - innerArea) : lum;
      const conScore = smoothstep(minLocalContrast, minLocalContrast + 0.1, lum - ringAvg);
      if (lumScore * satScore * conScore >= scoreThreshold) rawMask[i] = 1;
    }
  }

  // Dilate
  const mask = new Uint8Array(N);
  const pad = maskPadding;
  if (pad === 0) {
    mask.set(rawMask);
  } else {
    for (let y = 0; y < H; y++) {
      for (let x = 0; x < W; x++) {
        if (!rawMask[y * W + x]) continue;
        const y0 = Math.max(0, y - pad), y1 = Math.min(H - 1, y + pad);
        const x0 = Math.max(0, x - pad), x1 = Math.min(W - 1, x + pad);
        for (let py = y0; py <= y1; py++) {
          for (let px2 = x0; px2 <= x1; px2++) {
            const dx = px2 - x, dy = py - y;
            if (dx * dx + dy * dy <= pad * pad) mask[py * W + px2] = 1;
          }
        }
      }
    }
  }

  return { mask, px, W, H };
}

// ============================================================
// CONNECTED-COMPONENT LABELING (BFS flood fill)
// Assigns each star blob a unique random phase + speed,
// encoded into a texture: R=phase, G=speed, B=starness
// ============================================================
function buildStarDataTexture(mask, W, H) {
  const N = W * H;
  const canvas = document.createElement('canvas');
  canvas.width = W; canvas.height = H;
  const ctx = canvas.getContext('2d');
  const imgData = ctx.createImageData(W, H);
  const data = imgData.data;

  // Fill alpha to 255
  for (let i = 0; i < N; i++) data[i * 4 + 3] = 255;

  const visited = new Uint8Array(N);
  const queue = [];
  let starCount = 0;

  for (let y = 0; y < H; y++) {
    for (let x = 0; x < W; x++) {
      const i = y * W + x;
      if (!mask[i] || visited[i]) continue;

      // New star blob — assign unique random phase and speed
      starCount++;
      const phase = Math.floor(Math.random() * 256);  // 0-255 → maps to 0-2π in shader
      const speed = Math.floor(Math.random() * 256);  // 0-255 → maps to speed range in shader

      // BFS
      queue.length = 0;
      queue.push(i);
      visited[i] = 1;
      let head = 0;

      while (head < queue.length) {
        const ci = queue[head++];
        const cx = ci % W;
        const cy = (ci - cx) / W;

        // Write star data
        const oi = ci * 4;
        data[oi] = phase;      // R = phase
        data[oi + 1] = speed;  // G = speed
        data[oi + 2] = 255;    // B = starness (is a star)

        // 8-connected neighbors
        for (let dy = -1; dy <= 1; dy++) {
          for (let dx = -1; dx <= 1; dx++) {
            if (dx === 0 && dy === 0) continue;
            const nx = cx + dx, ny = cy + dy;
            if (nx < 0 || nx >= W || ny < 0 || ny >= H) continue;
            const ni = ny * W + nx;
            if (!mask[ni] || visited[ni]) continue;
            visited[ni] = 1;
            queue.push(ni);
          }
        }
      }
    }
  }

  console.log('[Sky] Connected components:', starCount, 'individual stars found');
  ctx.putImageData(imgData, 0, 0);
  return canvas;
}

// ============================================================
// BUILD CLEAN SKY (stars replaced with background color)
// ============================================================
function buildCleanSky(mask, px, W, H) {
  const N = W * H;
  const canvas = document.createElement('canvas');
  canvas.width = W; canvas.height = H;
  const ctx = canvas.getContext('2d');
  const imgData = ctx.createImageData(W, H);
  const cd = imgData.data;

  // Copy original pixels
  for (let i = 0; i < px.length; i++) cd[i] = px[i];

  // Replace masked pixels with ring-average from non-masked neighbors
  const outerR = STAR_PARAMS.sampleRadius + STAR_PARAMS.maskPadding;
  for (let i = 0; i < N; i++) {
    if (!mask[i]) continue;
    const x = i % W, y = (i - x) / W;
    let sumR = 0, sumG = 0, sumB = 0, cnt = 0;
    for (let dy = -outerR; dy <= outerR; dy++) {
      for (let dx = -outerR; dx <= outerR; dx++) {
        const nx = x + dx, ny = y + dy;
        if (nx < 0 || nx >= W || ny < 0 || ny >= H) continue;
        const ni = ny * W + nx;
        if (mask[ni]) continue; // skip star pixels
        sumR += px[ni * 4]; sumG += px[ni * 4 + 1]; sumB += px[ni * 4 + 2];
        cnt++;
      }
    }
    if (cnt > 0) {
      cd[i * 4] = Math.round(sumR / cnt);
      cd[i * 4 + 1] = Math.round(sumG / cnt);
      cd[i * 4 + 2] = Math.round(sumB / cnt);
    }
  }

  ctx.putImageData(imgData, 0, 0);
  return canvas;
}

// ============================================================
// MAIN
// ============================================================
function main() {
  const renderer = new THREE.WebGLRenderer({ antialias: false });
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
  document.body.appendChild(renderer.domElement);

  const scene = new THREE.Scene();
  const camera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0, 1);

  const skyImg = new Image();
  skyImg.onload = () => {
    const skyTexture = new THREE.Texture(skyImg);
    skyTexture.minFilter = THREE.LinearFilter;
    skyTexture.magFilter = THREE.LinearFilter;
    skyTexture.needsUpdate = true;

    const screenAspect = window.innerWidth / window.innerHeight;
    const skyAspect = skyImg.width / skyImg.height;

    const skyGeo = new THREE.PlaneGeometry(2, 2);
    const skyMat = new THREE.ShaderMaterial({
      uniforms: {
        uSky: { value: skyTexture },
        uSkyClean: { value: skyTexture },
        uStarData: { value: null },
        uTime: { value: 0.0 },
        uScreenAspect: { value: screenAspect },
        uImageAspect: { value: skyAspect },
        uTwinkleActive: { value: 0.0 },
        // Living sky uniforms (computed in JS animate loop)
        uTempTint: { value: new THREE.Vector3(1, 1, 1) },
        uGlowIntensity: { value: 0.0 },
        uVignetteOpacity: { value: 0.09 },
        uLightPos: { value: new THREE.Vector2(0.5, 0.25) },
        uGodRayIntensity: { value: 0.29 },
        uGlowCenter: { value: new THREE.Vector2(0.61, 0.62) },
        uGlowSpread: { value: 5.2 },
        uNoiseAmount: { value: 0.07 },
        uTwinkleSpeedMin: { value: 0.5 },
        uTwinkleSpeedRange: { value: 1.8 },
        uMorphAmp: { value: 0.017 },
        uMorphSpeed: { value: 0.052 },
        uMorphScale: { value: 3.0 },
        uVibrance: { value: 1.17 },
      },
      vertexShader: `
        varying vec2 vUv;
        void main() {
          vUv = uv;
          gl_Position = vec4(position.xy, 0.0, 1.0);
        }
      `,
      fragmentShader: `
        // === UNIFORMS ===
        uniform sampler2D uSky;
        uniform sampler2D uSkyClean;
        uniform sampler2D uStarData;
        uniform float uTime;
        uniform float uScreenAspect;
        uniform float uImageAspect;
        uniform float uTwinkleActive;
        uniform vec3 uTempTint;
        uniform float uGlowIntensity;
        uniform float uVignetteOpacity;
        uniform vec2 uLightPos;
        uniform float uGodRayIntensity;
        uniform vec2 uGlowCenter;
        uniform float uGlowSpread;
        uniform float uNoiseAmount;
        uniform float uTwinkleSpeedMin;
        uniform float uTwinkleSpeedRange;
        uniform float uMorphAmp;
        uniform float uMorphSpeed;
        uniform float uMorphScale;
        uniform float uVibrance;
        varying vec2 vUv;

        // === ASHIMA 2D SIMPLEX NOISE ===
        vec3 mod289(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
        vec2 mod289(vec2 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
        vec3 permute(vec3 x) { return mod289(((x * 34.0) + 1.0) * x); }

        float snoise(vec2 v) {
          const vec4 C = vec4(0.211324865405187, 0.366025403784439,
                             -0.577350269189626, 0.024390243902439);
          vec2 i  = floor(v + dot(v, C.yy));
          vec2 x0 = v - i + dot(i, C.xx);
          vec2 i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
          vec4 x12 = x0.xyxy + C.xxzz;
          x12.xy -= i1;
          i = mod289(i);
          vec3 p = permute(permute(i.y + vec3(0.0, i1.y, 1.0)) + i.x + vec3(0.0, i1.x, 1.0));
          vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0);
          m = m * m; m = m * m;
          vec3 x = 2.0 * fract(p * C.www) - 1.0;
          vec3 h = abs(x) - 0.5;
          vec3 ox = floor(x + 0.5);
          vec3 a0 = x - ox;
          m *= 1.79284291400159 - 0.85373472095314 * (a0*a0 + h*h);
          vec3 g;
          g.x = a0.x * x0.x + h.x * x0.y;
          g.yz = a0.yz * x12.xz + h.yz * x12.yw;
          return 130.0 * dot(m, g);
        }

        // === GOD RAYS ===
        vec3 computeGodRays(vec2 uv, vec2 lightPos) {
          float t = mod(uTime, 10000.0);
          vec2 delta = uv - lightPos;
          float dist = length(delta);
          vec2 rayDir = delta / max(dist, 0.001);

          // Noise mask (once per pixel, not per sample)
          float angle = atan(delta.y, delta.x);
          float noiseMask = snoise(vec2(angle * 5.0 + t * 0.008, 1.5));
          noiseMask = smoothstep(0.2, 0.8, noiseMask * 0.5 + 0.5);

          // Radial march toward light (40 samples)
          float rayAccum = 0.0;
          vec2 sampleUV = uv;
          float stepLen = 0.3 / 40.0;

          for (int i = 0; i < 40; i++) {
            sampleUV -= rayDir * stepLen;
            vec2 clamped = clamp(sampleUV, 0.001, 0.999);
            vec3 samp = texture2D(uSky, clamped).rgb;
            float lum = dot(samp, vec3(0.2126, 0.7152, 0.0722));
            // Bright areas pass light, dark areas block
            float occlusion = smoothstep(0.42, 0.65, lum);
            rayAccum += occlusion;
          }
          rayAccum /= 40.0;

          // Distance falloff
          float falloff = 1.0 - smoothstep(0.0, 0.85, dist);
          falloff *= falloff;

          vec3 rayColor = vec3(1.0, 0.94, 0.85);
          return rayColor * rayAccum * noiseMask * falloff * uGodRayIntensity;
        }

        // === MAIN ===
        void main() {
          float t = mod(uTime, 10000.0);

          // 1. Cover mode UV
          vec2 uv = vUv;
          if (uScreenAspect > uImageAspect) {
            float scale = uImageAspect / uScreenAspect;
            uv.y = uv.y * scale + (1.0 - scale) * 0.5;
          } else {
            float scale = uScreenAspect / uImageAspect;
            uv.x = uv.x * scale + (1.0 - scale) * 0.5;
          }

          // 2. Cloud morph (UV distortion via noise)
          vec2 morphUV = uv; // save original for star data lookup
          if (uMorphAmp > 0.0) {
            float mt = t * uMorphSpeed;
            float dx = snoise(uv * uMorphScale + vec2(mt, 0.0));
            float dy = snoise(uv * uMorphScale + vec2(0.0, mt) + 50.0);
            // Edge fade: reduce distortion near image edges to prevent clamping artifacts
            float edgeFade = smoothstep(0.0, 0.05, uv.x) * smoothstep(1.0, 0.95, uv.x)
                           * smoothstep(0.0, 0.05, uv.y) * smoothstep(1.0, 0.95, uv.y);
            uv += vec2(dx, dy) * uMorphAmp * edgeFade;
          }

          // 3. Sample clean sky at MORPHED UV (star-free sky morphs freely)
          vec3 color = texture2D(uSkyClean, uv).rgb;

          // 4. Star twinkle — stars composited from ORIGINAL UV (pinned in place)
          if (uTwinkleActive > 0.5) {
            vec4 sd = texture2D(uStarData, morphUV);
            if (sd.b > 0.5) {
              float phase = sd.r * 6.2831;
              float speed = uTwinkleSpeedMin + sd.g * uTwinkleSpeedRange;
              float wave = sin(t * speed + phase);
              float twinkle = smoothstep(-0.3, 0.3, wave);
              vec3 star = texture2D(uSky, morphUV).rgb; // star from original position
              color = mix(color, star, twinkle);
            }
          }

          // 4. Color temperature breathing (uniform from JS)
          color *= uTempTint;

          // 4b. Vibrancy (saturation adjustment)
          float luma = dot(color, vec3(0.2126, 0.7152, 0.0722));
          color = mix(vec3(luma), color, uVibrance);

          // 5. Noise-based color modulation (spatially varying)
          float nt = t * 0.01;
          float n1 = snoise(uv * 1.5 + vec2(nt * 0.3, 0.0));
          float n2 = snoise(uv * 1.5 + vec2(0.0, nt * 0.4) + 100.0);
          float n3 = snoise(uv * 1.5 + vec2(nt * 0.35, nt * 0.2) + 200.0);
          color *= vec3(1.0 + n1 * uNoiseAmount, 1.0 + n2 * uNoiseAmount, 1.0 + n3 * uNoiseAmount);

          // 6. Atmospheric glow pulse
          float glowDist = length(uv - uGlowCenter);
          float glowMask = exp(-glowDist * glowDist * uGlowSpread);
          color += vec3(1.0, 0.85, 0.72) * glowMask * uGlowIntensity;

          // 7. God rays (screen blend)
          vec3 rays = computeGodRays(uv, uLightPos);
          color = color + rays - color * rays;

          // 8. Breathing vignette
          vec2 vigUv = vUv - 0.5;
          float vigDist = length(vigUv);
          float vig = smoothstep(0.6, 1.1, vigDist);
          vec3 vigColor = vec3(0.15, 0.08, 0.18);
          color = mix(color, vigColor, vig * uVignetteOpacity);

          gl_FragColor = vec4(color, 1.0);
        }
      `,
      depthWrite: false,
      depthTest: false,
    });
    const skyMesh = new THREE.Mesh(skyGeo, skyMat);
    skyMesh.renderOrder = 0;
    scene.add(skyMesh);

    // Foreground: Chance cutout
    const loader = new THREE.TextureLoader();
    const chanceTexture = loader.load('chance-cutout.png', () => {
      const chanceAspect = chanceTexture.image.width / chanceTexture.image.height;
      const chanceHeight = 1.7;
      const chanceWidth = chanceHeight * chanceAspect / screenAspect;

      const chanceGeo = new THREE.PlaneGeometry(chanceWidth, chanceHeight);
      const chanceMat = new THREE.MeshBasicMaterial({
        map: chanceTexture,
        transparent: true,
        depthWrite: false,
        depthTest: false,
      });
      const chanceMesh = new THREE.Mesh(chanceGeo, chanceMat);
      chanceMesh.position.set(0, -1.0 + chanceHeight * 0.5, 0);
      chanceMesh.renderOrder = 1;
      scene.add(chanceMesh);

      // --- Shooting star mesh ---
      const SHOOTING_STARS = [
        { startTime: 8,  startX: -0.8, startY: 0.2,  endX: -0.1, endY: 0.35 },
        { startTime: 28, startX: 0.1,  startY: 0.4,  endX: 0.85, endY: 0.55 },
        { startTime: 48, startX: -0.5, startY: 0.5,  endX: 0.25, endY: 0.65 },
      ];
      const ssGeo = new THREE.PlaneGeometry(0.3, 0.008);
      const ssMat = new THREE.ShaderMaterial({
        uniforms: {
          uOpacity: { value: 0.0 },
          uTrailFade: { value: 0.0 },
        },
        vertexShader: `
          varying vec2 vUv;
          void main() {
            vUv = uv;
            gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
          }
        `,
        fragmentShader: `
          uniform float uOpacity;
          uniform float uTrailFade;
          varying vec2 vUv;
          void main() {
            // Taper: bright at right (head), fading left (tail)
            float head = smoothstep(0.0, 1.0, vUv.x);
            // Soft glow across width
            float width = 1.0 - abs(vUv.y - 0.5) * 2.0;
            width = pow(max(width, 0.0), 0.5);
            // Trail dissolve during linger phase
            float trail = smoothstep(uTrailFade, uTrailFade + 0.3, vUv.x);
            // Combine
            float alpha = head * width * trail * uOpacity;
            vec3 color = vec3(1.0, 0.96, 0.90);
            gl_FragColor = vec4(color * alpha, alpha);
          }
        `,
        transparent: true,
        blending: THREE.AdditiveBlending,
        depthWrite: false,
        depthTest: false,
      });
      const ssMesh = new THREE.Mesh(ssGeo, ssMat);
      ssMesh.renderOrder = 0.5;
      scene.add(ssMesh);

      // Render static frame immediately
      renderer.render(scene, camera);
      console.log('[Sky] Static sky loaded. Computing star detection...');

      // Star detection (deferred so page renders first)
      setTimeout(() => {
        // Step 1: Detect star mask
        const { mask, px, W, H } = detectStarMask(skyImg);

        // Step 2: Connected-component labeling → per-star phase/speed texture
        const starDataCanvas = buildStarDataTexture(mask, W, H);
        const starDataTexture = new THREE.Texture(starDataCanvas);
        starDataTexture.minFilter = THREE.NearestFilter;  // CRITICAL: no interpolation
        starDataTexture.magFilter = THREE.NearestFilter;  // categorical data, not visual
        starDataTexture.needsUpdate = true;

        // Step 3: Build clean sky (stars removed)
        const cleanSkyCanvas = buildCleanSky(mask, px, W, H);
        const cleanTexture = new THREE.Texture(cleanSkyCanvas);
        cleanTexture.minFilter = THREE.LinearFilter;
        cleanTexture.magFilter = THREE.LinearFilter;
        cleanTexture.needsUpdate = true;

        // Activate twinkle
        skyMat.uniforms.uSkyClean.value = cleanTexture;
        skyMat.uniforms.uStarData.value = starDataTexture;
        skyMat.uniforms.uTwinkleActive.value = 1.0;

        console.log('[Sky] Twinkle active!');

        // Debug panel helpers
        const dv = (id) => parseInt(document.getElementById(id).value);
        const dp = document.getElementById('debug-panel');
        window.addEventListener('keydown', (e) => {
          if (e.key === 'd' || e.key === 'D') dp.classList.toggle('visible');
        });
        // Update display values on slider input
        dp.querySelectorAll('input[type="range"]').forEach(input => {
          input.addEventListener('input', () => {
            const id = input.id.replace('d-', 'v-');
            const el = document.getElementById(id);
            if (!el) return;
            // Format based on which slider
            if (input.id.includes('warmR') || input.id.includes('coolR') || input.id.includes('warmB') || input.id.includes('coolB'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('glowMax'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('glowX') || input.id.includes('glowY'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('glowSpread'))
              el.textContent = (parseInt(input.value) / 10).toFixed(1);
            else if (input.id.includes('noiseAmt'))
              el.textContent = (parseInt(input.value) / 100).toFixed(3);
            else if (input.id.includes('rayInt'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('rayX') || input.id.includes('rayY'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('rayOrbit'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('vigMin') || input.id.includes('vigMax'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('twinkMin'))
              el.textContent = (parseInt(input.value) / 10).toFixed(1);
            else if (input.id.includes('twinkMax'))
              el.textContent = (parseInt(input.value) / 10).toFixed(1);
            else if (input.id.includes('ssOpacity'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('vibrance'))
              el.textContent = (parseInt(input.value) / 100).toFixed(2);
            else if (input.id.includes('morphAmp'))
              el.textContent = (parseInt(input.value) / 1000).toFixed(3);
            else if (input.id.includes('morphSpd'))
              el.textContent = (parseInt(input.value) / 1000).toFixed(3);
            else if (input.id.includes('morphScl'))
              el.textContent = (parseInt(input.value) / 10).toFixed(1);
          });
        });

        // Animation loop — timing designed for 60-second seamless loop
        function animate(timestamp) {
          requestAnimationFrame(animate);
          const t = timestamp * 0.001;
          skyMat.uniforms.uTime.value = t;

          // Read debug values (cheap — just parseInt on cached DOM elements)
          const warmR = dv('d-warmR') / 100;
          const coolR = dv('d-coolR') / 100;
          const warmB = dv('d-warmB') / 100;
          const coolB = dv('d-coolB') / 100;
          const glowMax = dv('d-glowMax') / 100;
          const rayInt = dv('d-rayInt') / 100;
          const rayCX = dv('d-rayX') / 100;
          const rayCY = dv('d-rayY') / 100;
          const rayOrbX = dv('d-rayOrbitX') / 100;
          const rayOrbY = dv('d-rayOrbitY') / 100;
          const vigMin = dv('d-vigMin') / 100;
          const vigMax = dv('d-vigMax') / 100;

          // Color temperature breathing (1 full cycle in 60s)
          const tempOsc = Math.sin(t * 0.1047) * 0.5 + 0.5;
          const tint = skyMat.uniforms.uTempTint.value;
          tint.x = warmR + tempOsc * (coolR - warmR);
          tint.y = 0.95;
          tint.z = warmB + tempOsc * (coolB - warmB);

          // Atmospheric glow pulse (2 full cycles in 60s)
          const glowOsc = Math.sin(t * 0.2094) * 0.5 + 0.5;
          skyMat.uniforms.uGlowIntensity.value = glowOsc * glowMax;

          // Breathing vignette (3 full cycles in 60s)
          const vigOsc = Math.sin(t * 0.3142) * 0.5 + 0.5;
          skyMat.uniforms.uVignetteOpacity.value = vigMin + vigOsc * (vigMax - vigMin);

          // God ray light — orbits behind Chance's head
          const orbitT = t * 0.1047; // 1 orbit in 60s
          const lp = skyMat.uniforms.uLightPos.value;
          lp.x = rayCX + Math.cos(orbitT) * rayOrbX;
          lp.y = rayCY + Math.sin(orbitT) * rayOrbY;
          skyMat.uniforms.uGodRayIntensity.value = rayInt;

          // Glow center + spread from debug panel
          skyMat.uniforms.uGlowCenter.value.x = dv('d-glowX') / 100;
          skyMat.uniforms.uGlowCenter.value.y = dv('d-glowY') / 100;
          skyMat.uniforms.uGlowSpread.value = dv('d-glowSpread') / 10;
          skyMat.uniforms.uNoiseAmount.value = dv('d-noiseAmt') / 100;
          skyMat.uniforms.uTwinkleSpeedMin.value = dv('d-twinkMin') / 10;
          skyMat.uniforms.uTwinkleSpeedRange.value = (dv('d-twinkMax') - dv('d-twinkMin')) / 10;

          // Vibrancy
          skyMat.uniforms.uVibrance.value = dv('d-vibrance') / 100;

          // Cloud morph
          skyMat.uniforms.uMorphAmp.value = dv('d-morphAmp') / 1000;
          skyMat.uniforms.uMorphSpeed.value = dv('d-morphSpd') / 1000;
          skyMat.uniforms.uMorphScale.value = dv('d-morphScl') / 10;

          // Shooting stars
          const loopT = t % 60;
          const ssMaxOpacity = dv('d-ssOpacity') / 100;
          let ssActive = false;

          for (const ss of SHOOTING_STARS) {
            const elapsed = loopT - ss.startTime;
            if (elapsed < 0 || elapsed > 3.0) continue;

            ssActive = true;
            const travelDur = 1.5;
            const angle = Math.atan2(ss.endY - ss.startY, ss.endX - ss.startX);

            if (elapsed < travelDur) {
              // Phase 1: Head traveling
              const progress = elapsed / travelDur;
              const fadeIn = Math.min(1.0, elapsed / 0.3);
              const headX = ss.startX + (ss.endX - ss.startX) * progress;
              const headY = ss.startY + (ss.endY - ss.startY) * progress;
              const cx = (ss.startX + headX) / 2;
              const cy = (ss.startY + headY) / 2;
              const dx = headX - ss.startX;
              const dy = headY - ss.startY;
              const len = Math.sqrt(dx * dx + dy * dy);

              ssMesh.scale.set(Math.max(0.01, len / 0.3), 1, 1);
              ssMesh.position.set(cx, cy, 0);
              ssMesh.rotation.z = angle;
              ssMat.uniforms.uOpacity.value = fadeIn * ssMaxOpacity;
              ssMat.uniforms.uTrailFade.value = 0.0;
            } else {
              // Phase 2: Trail lingering
              const lingerProgress = (elapsed - travelDur) / 1.5;
              const cx = (ss.startX + ss.endX) / 2;
              const cy = (ss.startY + ss.endY) / 2;
              const dx = ss.endX - ss.startX;
              const dy = ss.endY - ss.startY;
              const fullLen = Math.sqrt(dx * dx + dy * dy);

              ssMesh.scale.set(fullLen / 0.3, 1, 1);
              ssMesh.position.set(cx, cy, 0);
              ssMesh.rotation.z = angle;
              ssMat.uniforms.uOpacity.value = ssMaxOpacity * (1.0 - lingerProgress);
              ssMat.uniforms.uTrailFade.value = lingerProgress;
            }
            break;
          }
          if (!ssActive) ssMat.uniforms.uOpacity.value = 0.0;

          renderer.render(scene, camera);
        }
        requestAnimationFrame(animate);
        window.skyReady = true;
      }, 50);

      // Resize
      window.addEventListener('resize', () => {
        const newAspect = window.innerWidth / window.innerHeight;
        renderer.setSize(window.innerWidth, window.innerHeight);
        skyMat.uniforms.uScreenAspect.value = newAspect;
        const newChanceWidth = chanceHeight * chanceAspect / newAspect;
        chanceMesh.geometry.dispose();
        chanceMesh.geometry = new THREE.PlaneGeometry(newChanceWidth, chanceHeight);
      });
    });
    chanceTexture.minFilter = THREE.LinearFilter;
    chanceTexture.magFilter = THREE.LinearFilter;
  };
  skyImg.src = 'sky-panorama.jpg';
}

main();
</script>
</body>
</html>