trols.maxDistance = 2700;
				controls.target.set( 0, 500, 0 );
				controls.update();

				//

				window.addEventListener( 'resize', onWindowResize );

				// gui

				const gui = new GUI();

				gui.add( speed, 'value', 0, 1, 0.01 ).name( 'speed' );

			}

			function onWindowResize() {

				const { innerWidth, innerHeight } = window;

				camera.aspect = innerWidth / innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( innerWidth, innerHeight );

			}

			function render() {

				ren