xelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x333333 );

				camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 500 );

				// Z is up for objects intended to be 3D printed.

				camera.up.set( 0, 0, 1 );
				camera.position.set( - 100, - 250, 100 );
				scene.add( camera );

				controls = new 