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HTML 

              
                <!DOCTYPE html>
<html lang="ja">
  <head>
    <title>Add Remove Cube</title>
    <!-- CDNからThree.js読み込み -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
    <!-- フレームレートの描画 -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/stats.js/10/Stats.js"></script>
    <!-- プロパティのインタラクティブ調整バー描画 -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.9/dat.gui.min.js"></script>
    <style>
      body {
        /*ページ全体を使用するためmarginを0に設定
            overflowをhiddenに設定*/
        margin: 0;
        overflow: hidden;
      }
    </style>
  </head>
  <body>
    <!-- フレームレート表示 -->
    <div id="Stats-output"></div>
    <!-- (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 camera; // カメラ定義
      var scene; // シーン定義
      var renderer; // レンダラー定義

      /* すべての読み込みが終わってからThree.js関連の処理を実行 */
      function init() {
        var stats = initStats(); // フレームレートなど表示

        // オブジェクト、カメラ、ライトなどすべての要素を格納するシーン作成
        scene = new THREE.Scene();
        scene.fog = new THREE.FogExp2(0xffffff, 0.005); // 遠くの物が霞んで見える設定
        // カメラ設定
        camera = new THREE.PerspectiveCamera(
          45, // 視野
          window.innerWidth / window.innerHeight, // アスペクト
          0.1, // どの程度のカメラの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); // カメラをシーンに追加

        // Cameraに基づいてブラウザ内でどのように見えるか計算
        renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(new THREE.Color(0xeeeeee)); // レンダラー初期値決定
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.shadowMap.enabled = true; // オブジェクトシャドウを有効にする

        // 座標軸をシーンに追加
        // var axes = new THREE.AxisHelper(20);
        // scene.add(axes);

        // 平面作成
        var planeGeometry = new THREE.PlaneGeometry(60, 40, 1, 1); // width:60, height:40
        var planeMaterial = new THREE.MeshLambertMaterial({ color: 0xffffff });
        var plane = new THREE.Mesh(planeGeometry, planeMaterial);
        plane.receiveShadow = true; // 影を受ける

        // 回転と位置決め
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.x = 0;
        plane.position.y = 0;
        plane.position.z = 0;

        // シーンに平面を追加
        scene.add(plane);

        // シーンの中心にカメラを向ける
        camera.position.x = -30;
        camera.position.y = 40;
        camera.position.z = 30;
        camera.lookAt(scene.position);

        // 均等光源
        var ambientLight = new THREE.AmbientLight(0x0c0c0c);
        scene.add(ambientLight);

        // 光源をシーンに追加
        var spotLight = new THREE.SpotLight(0xffffff);
        spotLight.position.set(-20, 30, -5);
        spotLight.castShadow = true; // 影を落とす
        scene.add(spotLight);
        // レンダラーの出力をhtmlの(WebGL-output)に追加
        document
          .getElementById("WebGL-output")
          .appendChild(renderer.domElement);

        // インタラクティブに調整するプロパティ設定
        var controls = new (function () {
          this.rotationSpeed = 0.02; // 回転速度
          this.numberOfObjects = scene.children.length; // 現在のオブジェクト数
          // キューブを1つ削除する関数
          this.removeCube = function () {
            var allChildren = scene.children; // 子要素をすべて取得
            var lastObject = allChildren[allChildren.length - 1]; // 最後に追加したオブジェクト取得
            // planeでなければキューブを削除
            if (lastObject instanceof THREE.Mesh && lastObject != plane) {
              scene.remove(lastObject);
              // 個数の更新
              this.numberOfObjects = scene.children.length;
            }
          };
          // すべての追加したキューブを一括削除する関数
          this.removeAllCube = function () {
            var allChildren = scene.children;
            var iter = allChildren.length;
            for (var i = iter; i >= 0; --i) {
              var lastObject = allChildren[i];
              if (lastObject instanceof THREE.Mesh && lastObject != plane) {
                scene.remove(lastObject);
              }
            }
            this.numberOfObjects = scene.children.length;
          };
          // キューブを追加する関数
          this.addCube = function () {
            var cubeSize = Math.ceil(Math.random() * 3); // キューブサイズ決定
            var cubeGeometry = new THREE.BoxGeometry( // 正方形のジオメトリ作成
              cubeSize,
              cubeSize,
              cubeSize
            );
            var cubeMaterial = new THREE.MeshLambertMaterial({
              color: Math.random() * 0xffffff, // キューブ色決定
            });
            // キューブメッシュ作成
            var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
            cube.castShadow = true; // 影を落とす
            cube.name = "cube-" + scene.children.length; // メッシュ名称

            // ポジション決定
            cube.position.x =
              -30 + Math.round(Math.random() * planeGeometry.parameters.width);
            cube.position.y = Math.round(Math.random() * 5);
            cube.position.z =
              -20 + Math.round(Math.random() * planeGeometry.parameters.height);
            // シーンにキューブを追加
            scene.add(cube);
            // シーン内オブジェクトの個数更新
            this.numberOfObjects = scene.children.length;
          };
          // シーン内のオブジェクトをコンソール出力
          this.outputObjects = function () {
            console.log(scene.children);
          };
        })();
        // コントロールパネル設定
        var gui = new dat.GUI();
        gui.add(controls, "rotationSpeed", 0, 0.5); // 値の範囲0~0.5
        gui.add(controls, "addCube");
        gui.add(controls, "removeCube");
        gui.add(controls, "removeAllCube");
        gui.add(controls, "outputObjects");
        gui.add(controls, "numberOfObjects").listen();

        // シーンを描画
        render();
        // シーンを描画する関数
        function render() {
          stats.update();

          // 立方体を軸周りに回転
          // traverse : sceneに配置されたすべての子要素や孫要素を
          // 引数として受け取る
          scene.traverse(function (obj) {
            if (obj instanceof THREE.Mesh && obj != plane) {
              obj.rotation.x += controls.rotationSpeed;
              obj.rotation.y += controls.rotationSpeed;
              obj.rotation.z += controls.rotationSpeed;
            }
          });
          // レンダリング(再帰)
          requestAnimationFrame(render);
          // 表示
          renderer.render(scene, camera);
        }

        // フレームレート(fps) or 1フレーム描画にかかる時間(ms)表示
        function initStats() {
          var stats = new Stats();

          stats.setMode(0); // 0:fps, 1:ms

          // 位置設定
          stats.domElement.style.position = "absolute";
          stats.domElement.style.left = "0px";
          stats.domElement.style.top = "0px";
          // 出力をhtmlに追加する
          document.getElementById("Stats-output").appendChild(stats.domElement);

          return stats;
        }
      }

      // 表示領域をウィンドウサイズに合わせる
      function onResize() {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);
      }

      // 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());

      // リサイズイベント
      window.addEventListener("resize", onResize, false);
    </script>
  </body>
</html>
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