examples/webgl_geometry_colors.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - geometry - vertex colors</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 {
				color: #808080;
				font-family:Monospace;
				font-size:13px;
				text-align:center;

				background-color: #fff;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
			}

			a {

				color: #0080ff;
			}

		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> webgl - vertex colors</div>

		<script src="../build/three.min.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var container, stats;

			var camera, scene, renderer;

			var mesh, group1, group2, group3, light;

			var mouseX = 0, mouseY = 0;

			var windowHalfX = window.innerWidth / 2;
			var windowHalfY = window.innerHeight / 2;

			init();
			animate();

			function init() {

				container = document.getElementById( 'container' );

				camera = new THREE.PerspectiveCamera( 20, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 1800;

				scene = new THREE.Scene();

				light = new THREE.DirectionalLight( 0xffffff );
				light.position.set( 0, 0, 1 );
				scene.add( light );

				// shadow

				var canvas = document.createElement( 'canvas' );
				canvas.width = 128;
				canvas.height = 128;

				var context = canvas.getContext( '2d' );
				var gradient = context.createRadialGradient( canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 2 );
				gradient.addColorStop( 0.1, 'rgba(210,210,210,1)' );
				gradient.addColorStop( 1, 'rgba(255,255,255,1)' );

				context.fillStyle = gradient;
				context.fillRect( 0, 0, canvas.width, canvas.height );

				var shadowTexture = new THREE.Texture( canvas );
				shadowTexture.needsUpdate = true;

				var shadowMaterial = new THREE.MeshBasicMaterial( { map: shadowTexture } );
				var shadowGeo = new THREE.PlaneGeometry( 300, 300, 1, 1 );

				mesh = new THREE.Mesh( shadowGeo, shadowMaterial );
				mesh.position.y = - 250;
				mesh.rotation.x = - Math.PI / 2;
				scene.add( mesh );

				mesh = new THREE.Mesh( shadowGeo, shadowMaterial );
				mesh.position.y = - 250;
				mesh.position.x = - 400;
				mesh.rotation.x = - Math.PI / 2;
				scene.add( mesh );

				mesh = new THREE.Mesh( shadowGeo, shadowMaterial );
				mesh.position.y = - 250;
				mesh.position.x = 400;
				mesh.rotation.x = - Math.PI / 2;
				scene.add( mesh );

				var faceIndices = [ 'a', 'b', 'c', 'd' ];

				var color, f, f2, f3, p, n, vertexIndex,

					radius = 200,

					geometry  = new THREE.IcosahedronGeometry( radius, 1 ),
					geometry2 = new THREE.IcosahedronGeometry( radius, 1 ),
					geometry3 = new THREE.IcosahedronGeometry( radius, 1 );

				for ( var i = 0; i < geometry.faces.length; i ++ ) {

					f  = geometry.faces[ i ];
					f2 = geometry2.faces[ i ];
					f3 = geometry3.faces[ i ];

					n = ( f instanceof THREE.Face3 ) ? 3 : 4;

					for( var j = 0; j < n; j++ ) {

						vertexIndex = f[ faceIndices[ j ] ];

						p = geometry.vertices[ vertexIndex ];

						color = new THREE.Color( 0xffffff );
						color.setHSV( ( p.y / radius + 1 ) / 2, 1.0, 1.0 );

						f.vertexColors[ j ] = color;

						color = new THREE.Color( 0xffffff );
						color.setHSV( 0.0, ( p.y / radius + 1 ) / 2, 1.0 );

						f2.vertexColors[ j ] = color;

						color = new THREE.Color( 0xffffff );
						color.setHSV( 0.125 * vertexIndex/geometry.vertices.length, 1.0, 1.0 );

						f3.vertexColors[ j ] = color;

					}

				}


				var materials = [

					new THREE.MeshLambertMaterial( { color: 0xffffff, shading: THREE.FlatShading, vertexColors: THREE.VertexColors } ),
					new THREE.MeshBasicMaterial( { color: 0x000000, shading: THREE.FlatShading, wireframe: true, transparent: true } )

				];

				group1 = THREE.SceneUtils.createMultiMaterialObject( geometry, materials );
				group1.position.x = -400;
				group1.rotation.x = -1.87;
				scene.add( group1 );

				group2 = THREE.SceneUtils.createMultiMaterialObject( geometry2, materials );
				group2.position.x = 400;
				group2.rotation.x = 0;
				scene.add( group2 );

				group3 = THREE.SceneUtils.createMultiMaterialObject( geometry3, materials );
				group3.position.x = 0;
				group3.rotation.x = 0;
				scene.add( group3 );

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setSize( window.innerWidth, window.innerHeight );

				container.appendChild( renderer.domElement );

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				container.appendChild( stats.domElement );

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );

				//

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

			}

			function onWindowResize() {

				windowHalfX = window.innerWidth / 2;
				windowHalfY = window.innerHeight / 2;

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

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

			}

			function onDocumentMouseMove( event ) {

				mouseX = ( event.clientX - windowHalfX );
				mouseY = ( event.clientY - windowHalfY );

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				camera.position.x += ( mouseX - camera.position.x ) * 0.05;
				camera.position.y += ( - mouseY - camera.position.y ) * 0.05;

				camera.lookAt( scene.position );

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>