era = new t3d.Camera();
		camera.setPerspective(60 / 180 * Math.PI, width / height, 1, 1000);
		scene.add(camera);

		function loop(count) {
			requestAnimationFrame(loop);

			// rotate camera
			camera.euler.y = count / 1000 * 0.2;

			forwardRenderer.render(scene, camera);
		}
		requestAnimationFrame(loop);

		function onWindowResize() {
			width = window.innerWidth || 2;
			height = window.innerHeight || 2;

			camera.setPerspective(60 / 180 * Math.PI, width / height, 1, 1000);

			forwardRenderer.backR