examples/webgl_particles_shapes.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - particles - shapes</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;
				color: #aaa;
				background-color: #000;
				margin: 0px;
				overflow: hidden;
			}
		</style>
	</head>
	<body>


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

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

		<script src="js/shaders/CopyShader.js"></script>
		<script src="js/shaders/FilmShader.js"></script>
		<script src="js/shaders/FocusShader.js"></script>
		<script src="js/shaders/HorizontalBlurShader.js"></script>
		<script src="js/shaders/TriangleBlurShader.js"></script>
		<script src="js/shaders/VerticalBlurShader.js"></script>

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

		<!-- load the font file from canvas-text -->


		<script src="fonts/helvetiker_regular.typeface.js"></script>

			<script type="x-shader/x-vertex" id="vertexshader">

				attribute float size;
				attribute vec3 pcolor;

				varying vec3 vColor;

				void main() {

					vColor = pcolor;

					vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );

					gl_PointSize = size * ( 200.0 / length( mvPosition.xyz ) );

					gl_Position = projectionMatrix * mvPosition;

				}

			</script>

			<script type="x-shader/x-fragment" id="fragmentshader">

				uniform sampler2D texture;

				varying vec3 vColor;

				void main() {

					vec4 outColor = texture2D( texture, gl_PointCoord );

					gl_FragColor = outColor * vec4( vColor, 1.0 );

				}

			</script>

		<script>

			var container, stats;

			var camera, scene, renderer;

			var text, plane;

			var speed = 50;

			var pointLight;

			var targetRotation = 0;
			var targetRotationOnMouseDown = 0;

			var mouseX = 0;
			var mouseXOnMouseDown = 0;

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

			var delta = 1, clock = new THREE.Clock();

			var heartShape, particleCloud, sparksEmitter, emitterPos;
			var _rotation = 0;
			var timeOnShapePath = 0;

			var composer;
			var effectBlurX, effectBlurY, hblur, vblur;

			init();
			animate();

			function init() {

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

				var info = document.createElement( 'div' );
				info.style.position = 'absolute';
				info.style.top = '10px';
				info.style.width = '100%';
				info.style.textAlign = 'center';
				info.innerHTML = 'Three.js - simple particle systems with shapes by <a href="http://www.lab4games.net/zz85/blog">zz85</a><br>Move your mouse. Click to pause/resume.';
				container.appendChild( info );

				// CAMERA

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.set( 0, 150, 400 );

				// SCENE

				scene = new THREE.Scene();

				// LIGHTS

				var directionalLight = new THREE.DirectionalLight( 0xffffff, 0.5 );
				directionalLight.position.set( 0, -1, 1 );
				directionalLight.position.normalize();
				scene.add( directionalLight );

				pointLight = new THREE.PointLight( 0xffffff, 2, 300 );
				pointLight.position.set( 0, 0, 0 );
				scene.add( pointLight );

				// TEXT

				var theText = "THREE.JS";

				// Get text from hash

				var hash = document.location.hash.substr( 1 );

				if ( hash.length !== 0 ) {

					theText = hash;

				}

				var textMaterialFront = new THREE.MeshLambertMaterial( { color: 0xffffff, shading: THREE.FlatShading, opacity: 0.95 } );
				var textMaterialSide = new THREE.MeshLambertMaterial( { color: 0xffffff } );

				var text3d = new THREE.TextGeometry( theText, {

					size: 70,
					height: 25,
					curveSegments: 4,
					font: "helvetiker",

					bevelEnabled: true,
					bevelThickness: 2,
					bevelSize: 2,

					material: 0,
					extrudeMaterial: 1

				});

				text3d.materials = [ textMaterialFront, textMaterialSide ];

				text3d.computeVertexNormals();
				text3d.computeBoundingBox();

				var centerOffset = -0.5 * ( text3d.boundingBox.max.x - text3d.boundingBox.min.x );

				text = new THREE.Mesh( text3d, new THREE.MeshFaceMaterial() );

				// Potentially, we can extract the vertices or faces of the text to generate particles too.
				// Geo > Vertices > Position

				text.position.x = centerOffset;
				text.position.y = 130;
				text.position.z = -50;

				text.rotation.x = 0;
				text.rotation.y = Math.PI * 2;

						parent = new THREE.Object3D();
				parent.add( text );
				scene.add( parent );

				///// Create particle objects for Three.js

				var particlesLength = 70000;

				var particles = new THREE.Geometry();

				function newpos( x, y, z ) {

					return new THREE.Vector3( x, y, z );

				}


				var Pool = {

					__pools: [],

					// Get a new Vector

					get: function() {

						if ( this.__pools.length > 0 ) {

							return this.__pools.pop();

						}

						console.log( "pool ran out!" )
						return null;

					},

					// Release a vector back into the pool

					add: function( v ) {

						this.__pools.push( v );

					}

				};


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

					particles.vertices.push( newpos( Math.random() * 200 - 100, Math.random() * 100 + 150, Math.random() * 50 ) );
					Pool.add( i );

				}


				// Create pools of vectors

				attributes = {

					size:  { type: 'f', value: [] },
					pcolor: { type: 'c', value: [] }

				};

				var sprite = generateSprite() ;

				texture = new THREE.Texture( sprite );
				texture.needsUpdate = true;

				uniforms = {

					texture:   { type: "t", value: texture }

				};

				// PARAMETERS

				// Steadycounter
				// Life
				// Opacity
				// Hue Speed
				// Movement Speed

				function generateSprite() {

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

					var context = canvas.getContext( '2d' );


					// Just a square, doesnt work too bad with blur pp.
					// context.fillStyle = "white";
					// context.strokeStyle = "white";
					// context.fillRect(0, 0, 63, 63) ;

					// Heart Shapes are not too pretty here
					// var x = 4, y = 0;
					// context.save();
					// context.scale(8, 8); // Scale so canvas render can redraw within bounds
					// context.beginPath();
					// context.bezierCurveTo( x + 2.5, y + 2.5, x + 2.0, y, x, y );
					// context.bezierCurveTo( x - 3.0, y, x - 3.0, y + 3.5,x - 3.0,y + 3.5 );
					// context.bezierCurveTo( x - 3.0, y + 5.5, x - 1.0, y + 7.7, x + 2.5, y + 9.5 );
					// context.bezierCurveTo( x + 6.0, y + 7.7, x + 8.0, y + 5.5, x + 8.0, y + 3.5 );
					// context.bezierCurveTo( x + 8.0, y + 3.5, x + 8.0, y, x + 5.0, y );
					// context.bezierCurveTo( x + 3.5, y, x + 2.5, y + 2.5, x + 2.5, y + 2.5 );
					// context.closePath();

					context.beginPath();
					context.arc( 64, 64, 60, 0, Math.PI * 2, false) ;
					context.closePath();

					context.lineWidth = 0.5; //0.05
					context.stroke();
					context.restore();

					var gradient = context.createRadialGradient( canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 2 );

					gradient.addColorStop( 0, 'rgba(255,255,255,1)' );
					gradient.addColorStop( 0.2, 'rgba(255,255,255,1)' );
					gradient.addColorStop( 0.4, 'rgba(200,200,200,1)' );
					gradient.addColorStop( 1, 'rgba(0,0,0,1)' );

					context.fillStyle = gradient;

					context.fill();

					return canvas;

				}


				var shaderMaterial = new THREE.ShaderMaterial( {

					uniforms: 		uniforms,
					attributes:     attributes,

					vertexShader:   document.getElementById( 'vertexshader' ).textContent,
					fragmentShader: document.getElementById( 'fragmentshader' ).textContent,

					blending: 		THREE.AdditiveBlending,
					depthWrite:		false,
					transparent:	true

				});

				particleCloud = new THREE.ParticleSystem( particles, shaderMaterial );

				particleCloud.dynamic = true;
				//particleCloud.sortParticles = true;

				var vertices = particleCloud.geometry.vertices;
				var values_size = attributes.size.value;
				var values_color = attributes.pcolor.value;

				for( var v = 0; v < vertices.length; v ++ ) {

					values_size[ v ] = 50;

					values_color[ v ] = new THREE.Color( 0xffffff );
					values_color[ v ].setHSV( 0, 0, 0 );

					particles.vertices[ v ].set( Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY );

				}

				parent.add( particleCloud );
				particleCloud.y = 800;


				// Create Particle Systems

				// EMITTER STUFF

				// Heart

				var x = 0, y = 0;

				heartShape = new THREE.Shape();

				heartShape.moveTo( x + 25, y + 25 );
				heartShape.bezierCurveTo( x + 25, y + 25, x + 20, y, x, y );
				heartShape.bezierCurveTo( x - 30, y, x - 30, y + 35,x - 30,y + 35 );
				heartShape.bezierCurveTo( x - 30, y + 55, x - 10, y + 77, x + 25, y + 95 );
				heartShape.bezierCurveTo( x + 60, y + 77, x + 80, y + 55, x + 80, y + 35 );
				heartShape.bezierCurveTo( x + 80, y + 35, x + 80, y, x + 50, y );
				heartShape.bezierCurveTo( x + 35, y, x + 25, y + 25, x + 25, y + 25 );


				var hue = 0;

				var setTargetParticle = function() {

					var target = Pool.get();
					values_size[ target ] = Math.random() * 200 + 100;

					return target;

				};

				var onParticleCreated = function( p ) {

					var position = p.position;
					p.target.position = position;

					var target = p.target;

					if ( target ) {

						//console.log(target,particles.vertices[target]);
						//values_size[target]
						//values_color[target]

						hue += 0.0003 * delta;
						if ( hue > 1 ) hue -= 1;

						// TODO Create a PointOnShape Action/Zone in the particle engine

						timeOnShapePath += 0.00035 * delta;
						if ( timeOnShapePath > 1 ) timeOnShapePath -= 1;

						var pointOnShape = heartShape.getPointAt( timeOnShapePath );

						emitterpos.x = pointOnShape.x * 5 - 100;
						emitterpos.y = -pointOnShape.y * 5 + 400;

						//pointLight.position.copy( emitterpos );
						pointLight.position.x = emitterpos.x;
						pointLight.position.y = emitterpos.y;
						pointLight.position.z = 100;

						particles.vertices[ target ] = p.position;

						values_color[ target ].setHSV( hue, 0.8, 0.15 );

						pointLight.color.setHSV( hue, 0.8, 0.95 );


					};

				};

				var onParticleDead = function( particle ) {

					var target = particle.target;

					if ( target ) {

						// Hide the particle

						values_color[ target ].setHSV( 0, 0, 0 );
						particles.vertices[ target ].set( Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY );

						// Mark particle system as available by returning to pool

						Pool.add( particle.target );

					}

				};

				var engineLoopUpdate = function() {

				};


				sparksEmitter = new SPARKS.Emitter( new SPARKS.SteadyCounter( 500 ) );

				emitterpos = new THREE.Vector3( 0, 0, 0 );

				sparksEmitter.addInitializer( new SPARKS.Position( new SPARKS.PointZone( emitterpos ) ) );
				sparksEmitter.addInitializer( new SPARKS.Lifetime( 1, 15 ));
				sparksEmitter.addInitializer( new SPARKS.Target( null, setTargetParticle ) );


				sparksEmitter.addInitializer( new SPARKS.Velocity( new SPARKS.PointZone( new THREE.Vector3( 0, -5, 1 ) ) ) );
				// TOTRY Set velocity to move away from centroid

				sparksEmitter.addAction( new SPARKS.Age() );
				sparksEmitter.addAction( new SPARKS.Accelerate( 0, 0, -50 ) );
				sparksEmitter.addAction( new SPARKS.Move() );
				sparksEmitter.addAction( new SPARKS.RandomDrift( 90, 100, 2000 ) );


				sparksEmitter.addCallback( "created", onParticleCreated );
				sparksEmitter.addCallback( "dead", onParticleDead );
				sparksEmitter.start();

				//sparksEmitter.addCallback("loopUpdated", engineLoopUpdate);

				//sparksEmitter.addCallback("updated", function(p) {
					// var target = particle.target;
					// 					if (target) {
					// 						// update energy properties
					// 						//values_size[target] = Math.random()*100;
					// 					}
				//});
				//
				// End Particles


				renderer = new THREE.WebGLRenderer();
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setClearColorHex( 0x000000, 1 );

				container.appendChild( renderer.domElement );

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

				// POST PROCESSING

				var effectFocus = new THREE.ShaderPass( THREE.FocusShader );

				var effectCopy = new THREE.ShaderPass( THREE.CopyShader );
				effectFilm = new THREE.FilmPass( 0.5, 0.25, 2048, false );

				var shaderBlur = THREE.TriangleBlurShader;
				effectBlurX = new THREE.ShaderPass( shaderBlur, 'texture' );
				effectBlurY = new THREE.ShaderPass( shaderBlur, 'texture' );

				var radius = 15;
				var blurAmountX = radius / window.innerWidth;
				var blurAmountY = radius / window.innerHeight;

				hblur = new THREE.ShaderPass( THREE.HorizontalBlurShader );
				vblur = new THREE.ShaderPass( THREE.VerticalBlurShader);

				hblur.uniforms[ 'h' ].value =  1 / window.innerWidth;
				vblur.uniforms[ 'v' ].value =  1 / window.innerHeight;

				effectBlurX.uniforms[ 'delta' ].value = new THREE.Vector2( blurAmountX, 0 );
				effectBlurY.uniforms[ 'delta' ].value = new THREE.Vector2( 0, blurAmountY );

				effectFocus.uniforms[ 'sampleDistance' ].value = 0.99; //0.94
				effectFocus.uniforms[ 'waveFactor' ].value = 0.003;  //0.00125

				var renderScene = new THREE.RenderPass( scene, camera );

				composer = new THREE.EffectComposer( renderer );
				composer.addPass( renderScene );
				composer.addPass( hblur );
				composer.addPass( vblur );
				//composer.addPass( effectBlurX );
				//composer.addPass( effectBlurY );
				//composer.addPass( effectCopy );
				//composer.addPass( effectFocus );
				//composer.addPass( effectFilm );

				vblur.renderToScreen = true;
				effectBlurY.renderToScreen = true;
				effectFocus.renderToScreen = true;
				effectCopy.renderToScreen = true;
				effectFilm.renderToScreen = true;

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

				//

				hblur.uniforms[ 'h' ].value =  1 / window.innerWidth;
				vblur.uniforms[ 'v' ].value =  1 / window.innerHeight;

				var radius = 15;
				var blurAmountX = radius / window.innerWidth;
				var blurAmountY = radius / window.innerHeight;

				effectBlurX.uniforms[ 'delta' ].value = new THREE.Vector2( blurAmountX, 0 );
				effectBlurY.uniforms[ 'delta' ].value = new THREE.Vector2( 0, blurAmountY );

				composer.reset();

			}

			//

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


			function onDocumentMouseDown( event ) {

				event.preventDefault();

				mouseXOnMouseDown = event.clientX - windowHalfX;
				targetRotationOnMouseDown = targetRotation;

				if ( sparksEmitter.isRunning() ) {

					sparksEmitter.stop();

				} else {

					sparksEmitter.start();

				}

			}

			function onDocumentMouseMove( event ) {

				mouseX = event.clientX - windowHalfX;

				targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;

			}

			function onDocumentTouchStart( event ) {

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

					event.preventDefault();

					mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
					targetRotationOnMouseDown = targetRotation;

				}

			}

			function onDocumentTouchMove( event ) {

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

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;

				}

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}


			function render() {

				delta = speed * clock.getDelta();

				particleCloud.geometry.verticesNeedUpdate = true;

				attributes.size.needsUpdate = true;
				attributes.pcolor.needsUpdate = true;

				// Pretty cool effect if you enable this
				//particleCloud.rotation.y += 0.05;

				parent.rotation.y += ( targetRotation - parent.rotation.y ) * 0.05;

				renderer.clear();

				//renderer.render( scene, camera );
				composer.render( 0.1 );


			}

		</script>

	</body>
</html>