javascript
/
three.js
spiegel van https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - buffergeometry - lines drawcalls</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: #cccccc;
				font-family:Monospace;
				font-size:13px;
				text-align:center;

				background-color: #000000;
				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 - buffergeometry drawcalls - by <a href="https://twitter.com/fernandojsg">fernandojsg</a>
		</div>

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

		<script>
			var group;
			var container, stats;
	        var particlesData = [];
			var camera, scene, renderer;
			var positions,colors;
			var pointCloud;
			var particlePositions;

			var maxParticleCount = 1000;
            var particleCount = 500;
			var r = 800;

			var rHalf = r/2;

			var linesMesh;

			var effectController = {
				showDots: true,
				showLines: true,
				minDistance: 150,
				limitConnections: false,
				maxConnections: 20,
				particleCount: 500
			}

			init();
			animate();

			function initGUI() {
				
				var gui = new dat.GUI();
				
				gui.add( effectController, "showDots" ).onChange( function(value) {pointCloud.visible = value;} );
				gui.add( effectController, "showLines" ).onChange( function(value) {linesMesh.visible = value; } );
				gui.add( effectController, "minDistance", 10, 300 );
				gui.add( effectController, "limitConnections" );
				gui.add( effectController, "maxConnections", 0, 30,1 );
				gui.add( effectController, "particleCount", 0, maxParticleCount,1 ).onChange(function(value) { 
					particleCount = parseInt(value); 		       
					particles.drawcalls[0].count = particleCount;
				});
					
			}

			function init() {
				initGUI();

				container = document.getElementById( 'container' );

				//

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 4000 );
				camera.position.z = 1750;

				controls = new THREE.OrbitControls( camera );
				controls.damping = 0.2;
				controls.addEventListener( 'change', render );

				scene = new THREE.Scene();
	
				geometry = new THREE.BufferGeometry();
				var material = new THREE.LineBasicMaterial({ vertexColors: THREE.VertexColors });

		        var segments = maxParticleCount * maxParticleCount;

				positions = new Float32Array( segments * 3 );
				colors = new Float32Array( segments * 3 );

		        var pMaterial = new THREE.PointCloudMaterial({
		            color: 0xFFFFFF,
		            size: 3,
		            blending: THREE.AdditiveBlending,
		            transparent: true,
		            sizeAttenuation: false
		        });

				//particles = new THREE.Geometry();
				particles = new THREE.BufferGeometry();
				particlePositions = new Float32Array( maxParticleCount * 3 );

			   	for (var i = 0; i < maxParticleCount; i++) {

					var x = Math.random() * r - r / 2;
					var y = Math.random() * r - r / 2;
					var z = Math.random() * r - r / 2;
	
		            particlePositions[i*3] = x;
					particlePositions[i*3+1] = y;
					particlePositions[i*3+2] = z;

		            // add it to the geometry
		            particlesData.push({
		            	velocity: new THREE.Vector3(-1+Math.random()*2, -1+Math.random()*2, -1+Math.random()*2),
		            	numConnections: 0
		            });

		        }

		        particles.drawcalls.push( {
		            start: 0,
		            count: particleCount,
		            index: 0
		        } );

				particles.addAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ) );

				// create the particle system
		        pointCloud = new THREE.PointCloud(
		            particles,
		            pMaterial);


		        group = new THREE.Object3D();

		        // add it to the scene
		        group.add(pointCloud);

				geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
				geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );

				geometry.computeBoundingSphere();

		        geometry.drawcalls.push( {
		            start: 0,
		            count: 0,
		            index: 0
		        } );

				linesMesh = new THREE.Line( geometry, material, THREE.LinePieces );
				group.add( linesMesh );

				scene.add(group);
				
				//
				
				renderer = new THREE.WebGLRenderer( { antialias: true } );
		        renderer.setPixelRatio( window.devicePixelRatio )
				renderer.setSize( window.innerWidth, window.innerHeight );

				renderer.gammaInput = true;
				renderer.gammaOutput = true;

				container.appendChild( renderer.domElement );

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

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

			}

			function onWindowResize() {

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

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

			}

			//
			var numConnected;

			function animate() {

				var vertexpos=0;
				var colorpos=0;
				numConnected = 0;

    			for (var i = 0; i < particleCount; i++)
    				particlesData[i].numConnections = 0;

    			for (var i = 0; i < particleCount; i++) {

    	    		// get the particle
	        		var particleData = particlesData[i];

					particlePositions[i*3]+=particleData.velocity.x;
					particlePositions[i*3+1]+=particleData.velocity.y;
					particlePositions[i*3+2]+=particleData.velocity.z;

	        		if (particlePositions[i*3+1]<-rHalf || particlePositions[i*3+1]>rHalf)
	            		particleData.velocity.y=-particleData.velocity.y;

			        if (particlePositions[i*3]<-rHalf || particlePositions[i*3]>rHalf)
			            particleData.velocity.x=-particleData.velocity.x;

			        if (particlePositions[i*3+2]<-rHalf || particlePositions[i*3+2]>rHalf)
			            particleData.velocity.z=-particleData.velocity.z;

		        	//if (effectController.maxConnections
		        	if (effectController.limitConnections && particleData.numConnections >= effectController.maxConnections)
		        		continue;

			        // Check collision
			        for (var j = i+1; j < particleCount; j++) {

		            	var particleDataB = particlesData[j];
		        		if (effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections)
			        		continue;
						
						var dx = particlePositions[i*3] - particlePositions[j*3];
						var dy = particlePositions[i*3+1] - particlePositions[j*3+1];
						var dz = particlePositions[i*3+2] - particlePositions[j*3+2];
						var dist = Math.sqrt(dx*dx+dy*dy+dz*dz);

			            //var dist = particle.distanceTo(particleB);

			            if (dist < effectController.minDistance) {
				        	
							particleData.numConnections++;
							particleDataB.numConnections++;

			                var alpha = 1.0-dist/effectController.minDistance+0.2;

			                positions[ vertexpos++ ] = particlePositions[i*3];
			                positions[ vertexpos++ ] = particlePositions[i*3+1];
			                positions[ vertexpos++ ] = particlePositions[i*3+2];

			                positions[ vertexpos++ ] = particlePositions[j*3];
			                positions[ vertexpos++ ] = particlePositions[j*3+1];
			                positions[ vertexpos++ ] = particlePositions[j*3+2];
			               

			                colors[ colorpos++ ] = alpha;
			                colors[ colorpos++ ] = alpha;
			                colors[ colorpos++ ] = alpha;

			                colors[ colorpos++ ] = alpha;
			                colors[ colorpos++ ] = alpha;
			                colors[ colorpos++ ] = alpha;

			                numConnected++;
			            }
			        }
			 	}


        		linesMesh.geometry.drawcalls[0].count = numConnected*2;
        		linesMesh.geometry.attributes.position.needsUpdate = true;
        		linesMesh.geometry.attributes.color.needsUpdate = true;

        		pointCloud.geometry.attributes.position.needsUpdate = true;

				requestAnimationFrame( animate );

				stats.update();
				render();

			}

			function render() {

				var time = Date.now() * 0.001;

				group.rotation.y = time*0.1;
				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>