examples/webgl_geometry_normals.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - geometry - normals</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px;
				width: 100%;
				padding: 5px;
				font-family: Monospace;
				font-size: 13px;
				text-align: center;
				color: #ffffff;
			}

			a {
				color: #ffffff;
			}
		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - geometry - normals</a>
		</div>

		<script src="../build/three.js"></script>
		<script src="js/controls/OrbitControls.js"></script>
		<script src="./js/libs/dat.gui.min.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

			var container, stats, gui;
			var camera, scene, renderer;
			var mesh, geometry;

			var geometries = [
				new THREE.BoxBufferGeometry( 200, 200, 200, 2, 2, 2 ),
				new THREE.CircleBufferGeometry( 200, 32 ),
				new THREE.CylinderBufferGeometry( 75, 75, 200, 8, 8 ),
				new THREE.IcosahedronBufferGeometry( 100, 1 ),
				new THREE.OctahedronBufferGeometry( 200, 0 ),
				new THREE.PlaneBufferGeometry( 200, 200, 4, 4 ),
				new THREE.RingBufferGeometry( 32, 64, 16 ),
				new THREE.SphereBufferGeometry( 100, 12, 12 ),
				new THREE.TorusBufferGeometry( 64, 16, 12, 12 ),
				new THREE.TorusKnotBufferGeometry( 64, 16 )
			];

			var options = {
				Geometry: 0
			};

			var material = new THREE.MeshBasicMaterial( { color: 0xfefefe, wireframe: true, opacity: 0.5 } );

			init();
			animate();

			function addMesh() {

				if ( mesh !== undefined ) {

					scene.remove( mesh );
					geometry.dispose();

				}

				geometry = geometries[ options.Geometry ];

				// scale geometry to a uniform size

				geometry.computeBoundingSphere();

				var scaleFactor = 160 / geometry.boundingSphere.radius;
				geometry.scale( scaleFactor, scaleFactor, scaleFactor );

				mesh = new THREE.Mesh( geometry, material );
				scene.add( mesh );

				var vertexNormalsHelper = new THREE.VertexNormalsHelper( mesh, 10 );
				mesh.add( vertexNormalsHelper );

			}

			function init() {

				container = document.getElementById( 'container' );

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.z = 500;

				scene = new THREE.Scene();

				addMesh();

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				var geometries = {
					BoxBufferGeometry: 0,
					CircleBufferGeometry: 1,
					CylinderBufferGeometry: 2,
					IcosahedronBufferGeometry: 3,
					OctahedronBufferGeometry: 4,
					PlaneBufferGeometry: 5,
					RingBufferGeometry: 6,
					SphereBufferGeometry: 7,
					TorusBufferGeometry: 8,
					TorusKnotBufferGeometry: 9
				};

				gui = new dat.GUI( { width: 350 } );
				gui.add( options, 'Geometry', geometries ).onChange( function () {

					addMesh();

				} );

				//

				var controls = new THREE.OrbitControls( camera, renderer.domElement );

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

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

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>