!== height;
		if ( needResize ) {

			renderer.setSize( width, height, false );

		}

		return needResize;

	}

	const gui = new GUI();
	gui.add( colorPass.uniforms.color.value, 'r', 0, 4 ).name( 'red' );
	gui.add( colorPass.uniforms.color.value, 'g', 0, 4 ).name( 'green' );
	gui.add( colorPass.uniforms.color.value, 'b', 0, 4 ).name( 'blue' );

	let then = 0;
	function render( now ) {

		now *= 0.001; // convert to seconds
		const deltaTime = now - then;
		then = now;

		if ( resizeRendererToDisplaySize( re