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HTML 

              
                <!DOCTYPE html>
<html lang="ja">
  <head>
    <!-- CDNからThree.js読み込み -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.js"></script>
  </head>
  <body>
    <!-- (表示) 出力を保持する -->
    <div id="WebGL-output"></div>

    <!-- Three.jsコードの記述 -->
    <script type="text/javascript">
      var scene; // シーン定義
      var camera; // カメラ定義
      var renderer; // レンダラー定義

      function init() {
        /* シーン作成 */
        scene = new THREE.Scene();

        /* カメラ作成 */
        camera = new THREE.PerspectiveCamera(
          45, // 視野
          window.innerWidth / window.innerHeight, // アスペクト
          0.1, // どの程度のカメラ距離から描画を始めるか
          1000 // どのくらい遠くまで見えるか
        );
        scene.add(camera);

        // カメラのポジションと向きを決定
        camera.position.x = -30;
        camera.position.y = 40;
        camera.position.z = 30;
        camera.lookAt(scene.position); // シーンの中心にカメラを向ける

        /* レンダラー作成 */
        renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(new THREE.Color(0xeeeeee));
        renderer.setSize(window.innerWidth, window.innerHeight);

        /* ライト作成 */
        // 均等光源(影ができない)
        var ambientLight = new THREE.AmbientLight(0x0c0c0c);
        scene.add(ambientLight);
        // 点座標への光源(影ができる)
        var spotLight = new THREE.SpotLight(0xffffff);
        spotLight.position.set(-20, 30, -5);
        spotLight.castShadow = true; // 影を落とす
        scene.add(spotLight);

        /* 球体作成 */
        var sphereGeometry = new THREE.SphereGeometry(9, 20, 20);
        var sphereMaterial = new THREE.MeshLambertMaterial({ color: 0x1327ff });
        var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);

        // 球体ポジション等
        sphere.position.x = 0;
        sphere.position.y = 0;
        sphere.position.z = 0;
        sphere.castShadow = true;

        // オブジェクトをシーンに追加
        scene.add(sphere);

        // レンダラーの出力をhtmlに追加する
        document
          .getElementById("WebGL-output")
          .appendChild(renderer.domElement);

        // シーンを描画
        render();
        // シーンを描画する関数
        function render() {
          // 表示
          renderer.render(scene, camera);
          // レンダリング(再帰)
          requestAnimationFrame(render);
        }
      }

      // 表示が終わってからThree.js関連処理(関数init)を実行
      window.addEventListener("load", init());
    </script>
  </body>
</html>
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