4);
          _cad.directionalLight.position.set(0, 0, 1).normalize();
          _cad.scene.add(_cad.directionalLight);

          _cad.renderer = new THREE.WebGLRenderer({ alpha: true });
          _cad.renderer.setSize(_cad.width, _cad.height);

          _cad.container = document.getElementById(_cad.id);
          _cad.container.appendChild(_cad.renderer.domElement);
        }

        this.animate = function() {
          requestAnimationFrame(_cad.animate);
          _cad.controls.update();
        }

