javascript
/
three.js
peilaus alkaen https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE HTML>
<html lang="en">
	<head>
		<title>three.js canvas/webgl - geometry - text</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"/>
		<style type="text/css">
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}
		</style>
	</head>
	<body>


		<script type="text/javascript" src="../build/Three.js"></script>

		<script type="text/javascript" src="js/RequestAnimationFrame.js"></script>
		<script type="text/javascript" src="js/Stats.js"></script>
		<script type="text/javascript" src="js/Tween.js"></script>
		<script type="text/javascript" src="js/Sparks.js"></script>
		
		<script type="text/javascript" src="js/ShaderExtras.js"></script> 
		<script type="text/javascript" src="js/postprocessing/EffectComposer.js"></script> 
		<script type="text/javascript" src="js/postprocessing/RenderPass.js"></script> 
		<script type="text/javascript" src="js/postprocessing/ShaderPass.js"></script> 
		<script type="text/javascript" src="js/postprocessing/MaskPass.js"></script> 
		<script type="text/javascript" src="js/postprocessing/BloomPass.js"></script>
					
		<!-- load the font file from canvas-text -->

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

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

				attribute float size;
				attribute vec4 ca;

				varying vec4 vColor;

				void main() {

					vColor = ca;

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

					gl_PointSize = size * ( 150.0 / length( mvPosition.xyz ) );

					gl_Position = projectionMatrix * mvPosition;

				}

			</script> 

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

				uniform vec3 color;
				uniform sampler2D texture;

				varying vec4 vColor;


				uniform float radius;

				uniform vec2 delta;

				varying vec2 texCoord;


				void main() {

					vec4 outColor = texture2D( texture, gl_PointCoord );

					if ( outColor.a < 0.5 ) discard;

					gl_FragColor = outColor * vec4( color * vColor.xyz, 1.0 );

					//float depth = gl_FragCoord.z / gl_FragCoord.w;
					///const vec3 fogColor = vec3( 0.0 );

					//float fogFactor = smoothstep( 200.0, 600.0, depth );
					//gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );

				}

			</script>

		<script type="text/javascript">

			var container, stats;

			var camera, scene, renderer;

			var text, plane;

			var targetRotation = 0;
			var targetRotationOnMouseDown = 0;

			var mouseX = 0;
			var mouseXOnMouseDown = 0;

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


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

			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 with WebGL Love. 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 = new THREE.Camera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.y = 150;
				camera.position.z = 700;
				camera.target.position.y = 150;

				scene = new THREE.Scene();

				// Get text from hash

				var theText = "THREE.JS";

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

				if ( hash.length !== 0 ) {

					theText = hash;

				}

				var text3d = new THREE.TextGeometry( theText, {

					size: 80,
					height: 20,
					curveSegments: 2,
					font: "helvetiker"

				});

				text3d.computeBoundingBox();
				var centerOffset = -0.5 * ( text3d.boundingBox.x[ 1 ] - text3d.boundingBox.x[ 0 ] );

                var textMaterial = new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff, wireframe: false } );

				text = new THREE.Mesh( text3d, textMaterial );
				// Potentially, we can extract the vertices or faces of the text to generate particles too.
				// Geo > Vertices > Position

                text.doubleSided = false;

                text.position.x = centerOffset;
                text.position.y = 100;
                text.position.z = 0;

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

				parent = new THREE.Object3D();
                parent.addChild( text );
				scene.addObject( parent );

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


				var particleslength = 50000;

				var particles = new THREE.Geometry();

				function newpos(x, y, z) {
							return new THREE.Vertex(
				            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: [] },
					ca: { type: 'c', value: [] } //ca //customColor

				};

				var sprite = generateSprite() ;
				textu = new THREE.Texture ( sprite );
				textu.needsUpdate = true;

				uniforms = {

					amplitude: { type: "f", value: 1.0 },
					color:     { type: "c", value: new THREE.Color( 0xffffff ) },
					texture:   { type: "t", value: 0, texture:textu} //
					// 


				};

				// PARAMS. 
				// 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( 0.6, 'rgba(200,200,200,1)' );
					gradient.addColorStop( 0.4, 'rgba(128,128,128,1)' );
					gradient.addColorStop( 1, 'rgba(0,0,0,1)' );


					context.fillStyle = gradient;

					context.fill();


					//var idata =context.getImageData(0, 0, canvas.width, canvas.height);
					//document.body.appendChild(canvas);
					return canvas;

				}


				var shaderMaterial = new THREE.MeshShaderMaterial( {

					uniforms: 		uniforms,
					attributes:     attributes,

					vertexShader:   document.getElementById( 'vertexshader' ).textContent,
					fragmentShader: document.getElementById( 'fragmentshader' ).textContent
					,
					blending: 		THREE.AdditiveBlending,
					depthTest: 		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.ca.value;

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

					values_size[ v ] = 50;
					values_color[ v ] = new THREE.Color( 0xaaff00 );
					values_color[ v ].setHSV( 0, 0, 0 );
					particles.vertices[v].position.set(Number.POSITIVE_INFINITY,Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY);

				}

				parent.addChild( particleCloud );
				//scene.addObject( 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 += 0.0006;
						if (hue>1) hue-=1;

						// TODO Create a PointOnShape Action/Zone in the particle engine
						timeOnShapePath += 0.002;
						if (timeOnShapePath > 1) timeOnShapePath -= 1;
						var pointOnShape = heartShape.getPointAt(timeOnShapePath);

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

						particles.vertices[target].position = p.position;

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

					}; 

				};

				var onParticleDead = function(particle) {
						var target = particle.target;
						if (target) {
							// Hide the particle
							values_color[target].setHSV(0, 0, 0);
							particles.vertices[target].position.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(600));

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

				sparksEmitter.addInitializer(new SPARKS.Position( new SPARKS.PointZone( emitterpos ) ) );
				sparksEmitter.addInitializer(new SPARKS.Lifetime(1,4));
				sparksEmitter.addInitializer(new SPARKS.Target(null, setTargetParticle));


				sparksEmitter.addInitializer(new SPARKS.Velocity(new SPARKS.PointZone(new THREE.Vector3(0,-50,10))));
				// 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(50,50,2000));


				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 );

				container.appendChild( renderer.domElement );

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

				// POST PROCESSING
					var shaderFocus = THREE.ShaderExtras[ "focus" ];
					var effectFocus = new THREE.ShaderPass( shaderFocus );

					var shaderBlur = THREE.ShaderExtras[ "triangleBlur" ];
					var effectBlur = new THREE.ShaderPass( shaderBlur, 'texture' );; //
					var blurAmount = 0.0020;
					effectBlur.uniforms['delta'].value = new THREE.Vector2(blurAmount,blurAmount);
					effectFocus.uniforms['sampleDistance'].value = 0.99; //0.94 
					effectFocus.uniforms['waveFactor'].value = 0.002;  //0.00125

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

					composer = new THREE.EffectComposer( renderer );
					composer.addPass( renderScene );
					composer.addPass( effectBlur ); // effectBlur  effectFocus

					effectBlur.renderToScreen = true;
					effectFocus.renderToScreen = true;

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

			}

			//

			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() {

				particleCloud.geometry.__dirtyVertices = true;
				particleCloud.geometry.__dirtyColors = true;
				attributes.size.needsUpdate = true;
				attributes.ca.needsUpdate = true;


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

				parent.rotation.y += ( targetRotation - parent.rotation.y ) * 0.05;
				//renderer.render( scene, camera );
				composer.render( );


			}

		</script>

	</body>
</html>