コピペで動くtree.js

Yamato Nagata 
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Three.js Cube</title>
    <style>
      body { margin: 0; }
      canvas { display: block; }
      #canvas -container { width: 100%; height: 100vh; }
    </style>
  </head>
  <body>
    <div id="canvas-container"></div>
    <script src="https://threejs.org/build/three.js"></script>
    <script>
      // create the scene, camera, and renderer
      var scene = new THREE.Scene();
      var camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 1000);
      var renderer = new THREE.WebGLRenderer();
      renderer.setSize(window.innerWidth, window.innerHeight);
      document.getElementById("canvas-container").appendChild(renderer.domElement);

      // create a cube and add it to the scene
      var geometry = new THREE.BoxGeometry(1, 1, 1);
      var material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
      var cube = new THREE.Mesh(geometry, material);
      scene.add(cube);

      // position the camera
      camera.position.z = 5;

      // render the scene
      function animate() {
        requestAnimationFrame(animate);
        cube.rotation.x += 0.01;
        cube.rotation.y += 0.01;
        renderer.render(scene, camera);
      }
      animate();

      // handle window resizing
      function onWindowResize() {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);
      }
      window.addEventListener('resize', onWindowResize, false);
    </script>
  </body>
</html>

このコードをエディタにコピペして、htmlとして保存してみてください。

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