spark/examples/dynamic-lighting/index.html

<!DOCTYPE html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Spark • VFX Dynamic Lighting</title>
  <style>
    html,
    body {
      margin: 0;
      height: 100%;
      background-color: black;
    }

    #canvas {
      position: absolute;
      width: 100%;
      height: 100%;
      touch-action: none;
    }

    header {
      position: absolute;
      z-index: 10;
      margin: 1rem 2rem;
    }

    label {
      font-family: sans-serif;
      font-size: 20px;
      color: white;
      cursor: pointer;
      margin-right: 2rem;
      margin-bottom: 0.5rem;
      background-color: black;
      border-radius: 10px;
    }

    header {
      width: 100%;
      padding: 0;
      margin-left: 0;
      padding-top: 20px;
      text-align: center;
    }

    @media screen and (max-width: 60em) {
      label {
        font-size: 18px;
      }

      header {
        margin-left: 1.2rem;
      }
    }

  </style>
</head>

<body>
  <header>
    <label><input type="checkbox" id="debug" autocomplete="off">Debug Light SDFs</label>
    <label><input type="checkbox" id="daynight" checked="checked" autocomplete="off"> Enable Lighting</label>
  </header>

  <canvas id="canvas"></canvas>
  <script type="importmap">
  {
    "imports": {
      "three": "/examples/js/vendor/three/build/three.module.js",
      "@sparkjsdev/spark": "/dist/spark.module.js"
    }
  }
  </script>
  <script type="module">
    import * as THREE from "three";
    import {
      SplatMesh,
      SplatEdit,
      SparkRenderer,
      SplatEditSdf,
      SplatEditSdfType,
      SplatEditRgbaBlendMode,
      FpsMovement,
      PointerControls,
    } from "@sparkjsdev/spark";
    import { getAssetFileURL } from "/examples/js/get-asset-url.js";

    const canvas = document.getElementById("canvas");
    const scene = new THREE.Scene();

    const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 100);
    camera.position.set(0, 0.3, -2.5);

    const renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement)

    // Create a SparkRenderer and add it to the scene to render all the Gsplats.
    const spark = new SparkRenderer({ renderer });
    scene.add(spark);

    const splatURL = await getAssetFileURL("fireplace.spz");
    const fireplace = new SplatMesh({ url: splatURL });
    fireplace.quaternion.set(1, 0, 0, 0);
    fireplace.position.set(0, -1, -10);
    scene.add(fireplace);

    const fpsMovement = new FpsMovement({ moveSpeed: 2 });
    const pointerControls = new PointerControls({ canvas });

    let night = true;
    const lights = [];
    // Debug SDF spheres
    const helpers = [];

    function createLight(scene, lightingLayer, position, color, radius, opacity) {
      const light = new SplatEditSdf({
        type: SplatEditSdfType.SPHERE,
        color: color,
        radius: radius,
        opacity: opacity,
      });
      light.position.copy(position);

      // create a wireframe helper
      const helper = new THREE.Mesh(
        new THREE.SphereGeometry(radius, 16, 16),
        new THREE.MeshBasicMaterial({ wireframe: true, color: color }),
      );
      helper.position.copy(light.position);
      helper.visible = false;
      scene.add(helper);
      helpers.push(helper);

      lightingLayer.add(light);
      lights.push(light);
    }

    // Create lighting layer
    const emberLayer = new SplatEdit({
      rgbaBlendMode: SplatEditRgbaBlendMode.ADD_RGBA,
      sdfSmooth: 0.1,
      softEdge: 0.8,
    });
    scene.add(emberLayer);

    const lightingLayer = new SplatEdit({
      rgbaBlendMode: SplatEditRgbaBlendMode.ADD_RGBA,
      sdfSmooth: 0.1,
      softEdge: 1.4,
    });
    scene.add(lightingLayer);

    const ambientLayer = new SplatEdit({
      rgbaBlendMode: SplatEditRgbaBlendMode.DARKEN,
      sdfSmooth: 0.1,
      softEdge: 0.05,
    });
    scene.add(ambientLayer);

    // glowing embers at the base of the fire
    createLight(
      scene,
      emberLayer,
      new THREE.Vector3(0.5, -1.0, -10.5),
      new THREE.Color(1, 0.6, 0.4),
      0.75,
      1,
    );

    // light in the fireplace
    createLight(
      scene,
      lightingLayer,
      new THREE.Vector3(0.3, -1.1, -10.6),
      new THREE.Color(1, 0.95, 0.2),
      1.6,
      0,
    );

    // ambient light throughout the full room
    createLight(
      scene,
      ambientLayer,
      new THREE.Vector3(0, 1, -11),
      new THREE.Color(1, 0.8, 0.6),
      6,
      0.8,
    );
    console.log(helpers);

    let lastTime;

    renderer.setAnimationLoop(time => {
      const timeSeconds = time * 0.0005;
      const deltaTime = timeSeconds - (lastTime ?? timeSeconds);
      lastTime = timeSeconds;

      // fpsMovement.update(deltaTime, camera);
      pointerControls.update(deltaTime, camera);
      camera.position.z = -2.5 - Math.sin(timeSeconds * 0.1) * 2;
      renderer.render(scene, camera);

      // Create flickering fire effect
      const baseHue = 0.04; // Orange-red base hue
      const fireHue = 0.03; // Yellow base hue
      const hueVariation = 0.03; // Slight variation in hue

      // Add some randomness to the flicker
      const randomFlicker = Math.sin(timeSeconds * 4) * 0.5 + 0.5;

      // we'll combine these to make a more natural flickering effect
      const mediumFlicker = Math.sin(timeSeconds * 13) * 0.1 + 0.1; // Medium flicker
      const fastFlicker = Math.sin(timeSeconds * 20) * 0.1 + 0.1; // Fast flicker
      const slowFlicker = Math.sin(timeSeconds * 6) * 0.04 + 0.5; // Slow base flicker
      // Combine the flickers
      const combinedFlicker = (slowFlicker + mediumFlicker + fastFlicker) / 3;

      for (let i = 0; i < lights.length - 1; i++) {
        const h = baseHue + combinedFlicker * hueVariation; // Slightly varying orange-red hue
        const s = 0.5 + randomFlicker * 0.3; // High saturation with slight variation
        const l = 0.5 + combinedFlicker * 0.2; // Varying brightness
        lights[i].color.setHSL(h, s, l);
        lights[i].visible = night;
      }

      lights[lights.length - 1].visible = night;
      lights[lights.length - 1].color.setHSL(baseHue, 0.5, combinedFlicker);
    });

    document.getElementById('debug').addEventListener('change', ev => {
      const visible = ev.target.checked;
      for (let helper of helpers) {
        helper.visible = visible;
      }
    });
    document.getElementById('daynight').addEventListener('change', ev => {
      night = !night;
    });
  </script>
</body>

</html>