// show
	RayHandler.useDiffuseLight(true);
		rayHandler = new RayHandler(world);
		rayHandler.setBlur(true);
		rayHandler.setAmbientLight(0.5f, 0.5f, 0.5f, 0.2f);
		pointLight = new PointLight(rayHandler, 100, Color.WHITE, 100,
				ball.getPosition().x, ball.getPosition().y);
		pointLight.setColor(0.3f, 0.3f, 0.3f, 1);
		pointLight.attachToBody(ball, 5, 5);

// render thread

		rayHandler.setCombinedMatrix(camera.combined);
		rayHandler.updateAndRender();