webgl_ribbons.html

<!doctype html>
<html lang="en">
	<head>
		<title>three.js webgl - ribbons</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 {
				background-color: #000000;
				margin: 0px;
				overflow: hidden;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
				font-weight: bold;
				text-align:center;
			}

			a {
				color:#0078ff;
			}

			#info {
				color:#fff;
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
				z-index:100;
			}
		</style>
	</head>

	<body>

		<script src="../build/Three.js"></script>

		<script src="js/ShaderExtras.js"></script>

		<script src="js/postprocessing/EffectComposer.js"></script>
		<script src="js/postprocessing/MaskPass.js"></script>
		<script src="js/postprocessing/RenderPass.js"></script>
		<script src="js/postprocessing/ShaderPass.js"></script>
		<script src="js/postprocessing/BloomPass.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/Stats.js"></script>

		<div id="info">
			<a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - webgl ribbons example
		</div>


		<script>

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

			var container, stats;
			var camera, scene, renderer, ribbon, geometry, geometry2, materials = [], ribbons = [],
				parameters, i, i2, h, color, x, y, z, z2, s, n, n2, nribbons, grid;

			var mouseX = 0, mouseY = 0;

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

			var postprocessing = { enabled  : true };

			var composer;

			init();
			animate();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				scene = new THREE.Scene();
				scene.fog = new THREE.FogExp2( 0x000000, 0.0016 );

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 3000 );
				camera.position.z = 1200;
				scene.add( camera );

				geometry = new THREE.Geometry();
				geometry2 = new THREE.Geometry();

				n = 1000;
				n2 = 2 * n;

				for ( i = -n; i < n; i++ ) {

					i2 = i + n;

					x = i * 1.175;
					y = ( i2 % 2 ) * 5;

					if ( i2 % 2 )  {

						z = 10 * Math.sin( i2 * 0.3 ) * Math.cos( i2 * 0.1 );

					}

					geometry.vertices.push( new THREE.Vector3( x, y, z ) );
					geometry2.vertices.push( new THREE.Vector3( x, y, z ) );

					h = i2 % 2 ? 1 : 0.15;
					if( i2 % 4 <= 2 ) h -= 0.15;

					color = new THREE.Color( 0xffffff );
					color.setHSV( 0.1 , 0, h );
					geometry.colors.push( color );
					geometry2.colors.push( color );

				}

				var tmpRot = new THREE.Matrix4();
				tmpRot.makeRotationAxis( new THREE.Vector3( 1, 0, 0 ), Math.PI/2 );

				xgrid = 34;
				ygrid = 15;
				nribbons = xgrid * ygrid;

				c = 0;
				for ( i = 0; i < xgrid; i ++ )
				for ( j = 0; j < ygrid; j ++ ) {

					materials[ c ] = new THREE.MeshBasicMaterial( { color: 0xffffff, vertexColors: true, doubleSided: true } );

					ribbon = new THREE.Ribbon( i % 2 ? geometry : geometry2, materials[ c ] );
					ribbon.rotation.x = 0;
					ribbon.rotation.y = Math.PI / 2;
					ribbon.rotation.z = Math.PI;

					x = 40 * ( i - xgrid/2 );
					y = 40 * ( j - ygrid/2 );
					z = 0;
					ribbon.position.set( x, y, z );

					materials[c].color.setHSV( i / xgrid, 0.3 +  0.7 * j / ygrid, 1 );

					ribbon.matrixAutoUpdate = false;

					// manually create local matrix

					ribbon.matrix.setPosition( ribbon.position );
					ribbon.matrixRotationWorld.setRotationFromEuler( ribbon.rotation );

					ribbon.matrix.elements[ 0 ] = ribbon.matrixRotationWorld.elements[ 0 ];
					ribbon.matrix.elements[ 4 ] = ribbon.matrixRotationWorld.elements[ 4 ];
					ribbon.matrix.elements[ 8 ] = ribbon.matrixRotationWorld.elements[ 8 ];

					ribbon.matrix.elements[ 1 ] = ribbon.matrixRotationWorld.elements[ 1 ];
					ribbon.matrix.elements[ 5 ] = ribbon.matrixRotationWorld.elements[ 5 ];
					ribbon.matrix.elements[ 9 ] = ribbon.matrixRotationWorld.elements[ 9 ];

					ribbon.matrix.elements[ 2 ] = ribbon.matrixRotationWorld.elements[ 2 ];
					ribbon.matrix.elements[ 6 ] = ribbon.matrixRotationWorld.elements[ 6 ];
					ribbon.matrix.elements[ 10 ] = ribbon.matrixRotationWorld.elements[ 10 ];

					ribbon.matrix.multiplySelf( tmpRot );

					ribbon.matrix.scale( ribbon.scale );
					ribbon.boundRadiusScale = Math.max( ribbon.scale.x, Math.max( ribbon.scale.y, ribbon.scale.z ) );

					ribbons.push( ribbon );
					scene.add( ribbon );

					c ++;

				}

				scene.matrixAutoUpdate = false;

				//

				renderer = new THREE.WebGLRenderer( { antialias: false } );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.autoClear = false;
				renderer.setClearColor( scene.fog.color, 1 );

				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 );
				document.addEventListener( 'touchstart', onDocumentTouchStart, false );
				document.addEventListener( 'touchmove', onDocumentTouchMove, false );

				//

				var renderModel = new THREE.RenderPass( scene, camera );
				var effectBloom = new THREE.BloomPass( 1.0 );
				var effectScreen = new THREE.ShaderPass( THREE.ShaderExtras[ "screen" ] );

				effectScreen.renderToScreen = true;

				composer = new THREE.EffectComposer( renderer );

				composer.addPass( renderModel );
				composer.addPass( effectBloom );
				composer.addPass( effectScreen );

				//

				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 );

				composer.reset();

			}

			function onDocumentMouseMove( event ) {

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

			}

			function onDocumentTouchStart( event ) {

				if ( event.touches.length === 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					mouseY = event.touches[ 0 ].pageY - windowHalfY;

				}

			}

			function onDocumentTouchMove( event ) {

				if ( event.touches.length === 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					mouseY = event.touches[ 0 ].pageY - windowHalfY;

				}

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				var time = Date.now() * 0.00005;

				camera.position.x += ( mouseX - camera.position.x ) * 0.036;
				camera.position.y += ( - mouseY - camera.position.y ) * 0.036;

				camera.lookAt( scene.position );

				for ( i = -n; i < n; i ++ ) {

					i2 = i + n;

					z  =  10 * Math.sin( i2 * 0.1 + time*30 );
					z2 =  20 * Math.cos( Math.sin( i2 * 0.1 + time * 20 ) );

					geometry.vertices[ i2 ].z = z;
					geometry2.vertices[ i2 ].z = z2;

				}

				geometry.verticesNeedUpdate = true;
				geometry2.verticesNeedUpdate = true;

				for( i = 0; i < nribbons; i++ ) {

					h = ( 360 * ( i / nribbons + time ) % 360 ) / 360;
					materials[ i ].color.setHSV( h, 0.5 + 0.5 * ( i % 20 / 20 ), 1 );

				}

				renderer.clear();
				composer.render( 0.1 );

			}

		</script>
	</body>
</html>