Casting shadows with Three.js's game

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Casting shadows with Three.js
Developer anonymous｜Date and time 70/1/1 9:42:03
Build time unknown sec｜Game capacity 2.523KB｜

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<html>
  <head>
    <meta charset="utf-8" />
    <script type="importmap">
      {
        "imports": {
          "three": "https://unpkg.com/three@0.152.2/build/three.module.js"
        }
      }
    </script>
    <script type="module">
      import * as THREE from "three";

// サイズを指定
      const width = 320;
      const height = 540;

// レンダラーを作成
      const renderer = new THREE.WebGLRenderer({
        canvas: document.querySelector("#myCanvas"),
      });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(width, height);

// レンダラー：シャドウを有効にする
      renderer.shadowMap.enabled = true;

// シーンを作成
      const scene = new THREE.Scene();

// カメラを作成
      const camera = new THREE.PerspectiveCamera(45, width / height);
      camera.position.set(20, 20, 20);
      camera.lookAt(new THREE.Vector3(0, 0, 0));

// 床を作成
      const meshFloor = new THREE.Mesh(
        new THREE.BoxGeometry(2000, 0.1, 2000),
        new THREE.MeshStandardMaterial({ color: 0x808080, roughness: 0.0 })
      );
      // 影を受け付ける
      meshFloor.receiveShadow = true;
      scene.add(meshFloor);

// オブジェクトを作成
      const meshKnot = new THREE.Mesh(
        new THREE.TorusKnotGeometry(3, 1, 100, 16),
        new THREE.MeshStandardMaterial({ color: 0xaa0000, roughness: 0.0 })
      );
      meshKnot.position.set(0, 5, 0);
      // 影を落とす
      meshKnot.castShadow = true;
      scene.add(meshKnot);

// 照明を作成
      const light = new THREE.SpotLight(0xffffff, 2, 100, Math.PI / 4, 1);
      // ライトに影を有効にする
      light.castShadow = true;
      light.shadow.mapSize.width =  512;
      light.shadow.mapSize.height = 512;
      scene.add(light);

tick();

// 毎フレーム時に実行されるループイベントです
      function tick() {
        // レンダリング
        renderer.render(scene, camera);

// 照明の位置を更新
        const t = Date.now() / 500;
        const r = 20.0;
        const lx = r * Math.cos(t);
        const lz = r * Math.sin(t);
        const ly = 20.0 + 5.0 * Math.sin(t / 3.0);
        light.position.set(lx, ly, lz);

requestAnimationFrame(tick);
      }
    </script>
  </head>
  <body>
    <canvas id="myCanvas"></canvas>
  </body>
</html>