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timer

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="https://unpkg.com/three@0.142.x/build/three.min.js"></script>
  <script src="https://unpkg.com/xnew@2.3.x/dist/xnew.js"></script>
  <script src="https://unpkg.com/xnew@2.3.x/dist/addons/xthree.js"></script>
  <style>
    body {
      margin: 0;
      height: 100vh;
    }
  </style>
</head>

<body>
  <div id="main" style="width: 100%; height: 100%;"></div>
  <script>
    xnew('#main', (self) => {
      const screen = xnew(xnew.Screen, { width: 800, height: 400 });

      const three = xthree.setup({ renderer: new THREE.WebGLRenderer({ canvas: screen.canvas }) });
      three.camera.position.set(0, 0, +100);

      xnew(Light);
      xnew(Cubes);
    });

    function Light(self) {
      const object = xthree.nest(new THREE.PointLight(0xFFFFFF, 1));
      object.position.set(0, 0, +100);
    }

    function Cubes(self) {
      // call iteratively (delay = 100ms, loop = true)

      xnew.timer(() => {
        xnew(Cube);
      }, 100, true);
    }

    function Cube(self) {
      const size = 10 * Math.random() + 5;

      const geometry = new THREE.BoxGeometry(size, size, size);
      const material = new THREE.MeshLambertMaterial({ color: 0xFFFFFF * Math.random() });
      const object = xthree.nest(new THREE.Mesh(geometry, material));
   
      object.position.x = 100 * (Math.random() - 0.5);
      object.position.y = 100 * (Math.random() - 0.5);
      object.position.z = 100 * (Math.random() - 0.5);

      const velocity = {};
      velocity.x = Math.random() - 0.5;
      velocity.y = Math.random() - 0.5;
      velocity.z = Math.random() - 0.5;

      // finalize after 5000ms
      xnew.timer(() => {
        self.finalize();
      }, 5 * 1000);

      return {
        update() {
          object.position.x += velocity.x;
          object.position.y += velocity.y;
          object.position.z += velocity.z;
          object.rotation.y += 0.01;
          object.rotation.x += 0.01;
        },
      };
    }
  </script>
</body>

</html>