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HTML

              
                <canvas id="myCanvas"></canvas>
              
            
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CSS

              
                
              
            
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JS

              
                // ページの読み込みを待つ
window.addEventListener('load', init);

function init() {

  // サイズを指定
  const width = 960;
  const height = 540;
  let rot = 0;

  // 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);

  // 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);

  // ジオメトリを作成(球体)
  const geometry = new THREE.SphereGeometry(300, 30, 30);
  // 画像を読み込む
  const loader = new THREE.TextureLoader();
  const texture = loader.load('https://s.cdpn.io/profiles/user/305282/512.jpg');
  // マテリアルを作成
  const material = new THREE.MeshStandardMaterial({map: texture});
  //メッシュを作成
  const mesh = new THREE.Mesh(geometry, material);
  //シーンにメッシュを適用
  scene.add(mesh);

  // 平行光源
  const directionalLight = new THREE.DirectionalLight(0xFFFFFF);
  directionalLight.position.set(1, 1, 1);
  // シーンに追加
  scene.add(directionalLight);


  // 星屑を作成 (カメラの動きをわかりやすくするため)
  createStarField();

  function createStarField() {
    // 形状データを作成
    const geometry = new THREE.Geometry();
    for (let i = 0; i < 1000; i++) {
      geometry.vertices.push(
        new THREE.Vector3(
          3000 * (Math.random() - 0.5),
          3000 * (Math.random() - 0.5),
          3000 * (Math.random() - 0.5)
        )
      );
    }
    // マテリアルを作成
    const material = new THREE.PointsMaterial({
      size: 10,
      color: 0xffffff
    });

    // 物体を作成
    const mesh = new THREE.Points(geometry, material);
    scene.add(mesh);
  }

  tick();

  // 毎フレーム時に実行されるループイベントです
  function tick() {

    rot += 0.5; // 毎フレーム角度を0.5度ずつ足していく

    // ラジアンに変換する
    const radian = (rot * Math.PI) / 180;
    // 角度に応じてカメラの位置を設定
    camera.position.x = 1000 * Math.sin(radian);
    camera.position.z = 1000 * Math.cos(radian);
    // 原点方向を見つめる
    camera.lookAt(new THREE.Vector3(0, 0, 0));
    // レンダリング
    renderer.render(scene, camera);    
    requestAnimationFrame(tick);
  }
}
              
            
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999px

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