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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - buffergeometry - lines drawcalls</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <style>
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+ body {
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+ color: #cccccc;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+
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+ background-color: #000000;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px; width: 100%;
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+ padding: 5px;
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+ }
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+
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+ a {
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+
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+ color: #0080ff;
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+ }
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+
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+ </style>
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info">
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+ <a href="http://threejs.org" target="_blank">three.js</a> webgl - buffergeometry drawcalls - by <a href="https://twitter.com/fernandojsg">fernandojsg</a>
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+ </div>
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+
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+ <script src="js/libs/dat.gui.min.js"></script>
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+ <script src="../build/three.min.js"></script>
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+ <script src="js/controls/OrbitControls.js"></script>
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+ <script src="js/libs/stats.min.js"></script>
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+
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+ <script>
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+ var group;
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+ var container, stats;
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+ var particlesData = [];
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+ var camera, scene, renderer;
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+ var positions,colors;
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+ var pointCloud;
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+ var particlePositions;
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+
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+ var maxParticleCount = 1000;
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+ var particleCount = 500;
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+ var r = 800;
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+
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+ var rHalf = r/2;
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+
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+ var linesMesh;
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+
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+ var effectController = {
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+ showDots: true,
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+ showLines: true,
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+ minDistance: 150,
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+ limitConnections: false,
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+ maxConnections: 20,
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+ particleCount: 500
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+ }
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+
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+ init();
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+ animate();
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+
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+ function initGUI() {
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+
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+ var gui = new dat.GUI();
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+
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+ gui.add( effectController, "showDots" ).onChange( function(value) {pointCloud.visible = value;} );
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+ gui.add( effectController, "showLines" ).onChange( function(value) {linesMesh.visible = value; } );
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+ gui.add( effectController, "minDistance", 10, 300 );
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+ gui.add( effectController, "limitConnections" );
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+ gui.add( effectController, "maxConnections", 0, 30,1 );
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+ gui.add( effectController, "particleCount", 0, maxParticleCount,1 ).onChange(function(value) {
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+ particleCount = parseInt(value);
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+ particles.drawcalls[0].count = particleCount;
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+ });
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+
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+ }
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+
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+ function init() {
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+ initGUI();
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+
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+ container = document.getElementById( 'container' );
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+
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+ //
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+
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 4000 );
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+ camera.position.z = 1750;
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+
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+ controls = new THREE.OrbitControls( camera );
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+ controls.damping = 0.2;
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+ controls.addEventListener( 'change', render );
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+
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+ scene = new THREE.Scene();
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+
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+ geometry = new THREE.BufferGeometry();
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+ var material = new THREE.LineBasicMaterial({ vertexColors: THREE.VertexColors });
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+
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+ var segments = maxParticleCount * maxParticleCount;
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+
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+ positions = new Float32Array( segments * 3 );
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+ colors = new Float32Array( segments * 3 );
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+
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+ var pMaterial = new THREE.PointCloudMaterial({
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+ color: 0xFFFFFF,
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+ size: 3,
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+ blending: THREE.AdditiveBlending,
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+ transparent: true,
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+ sizeAttenuation: false
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+ });
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+
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+ //particles = new THREE.Geometry();
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+ particles = new THREE.BufferGeometry();
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+ particlePositions = new Float32Array( maxParticleCount * 3 );
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+
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+ for (var i = 0; i < maxParticleCount; i++) {
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+
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+ var x = Math.random() * r - r / 2;
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+ var y = Math.random() * r - r / 2;
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+ var z = Math.random() * r - r / 2;
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+
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+ particlePositions[i*3] = x;
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+ particlePositions[i*3+1] = y;
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+ particlePositions[i*3+2] = z;
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+
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+ // add it to the geometry
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+ particlesData.push({
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+ velocity: new THREE.Vector3(-1+Math.random()*2, -1+Math.random()*2, -1+Math.random()*2),
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+ numConnections: 0
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+ });
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+
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+ }
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+
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+ particles.drawcalls.push( {
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+ start: 0,
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+ count: particleCount,
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+ index: 0
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+ } );
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+
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+ particles.addAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ) );
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+
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+ // create the particle system
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+ pointCloud = new THREE.PointCloud(
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+ particles,
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+ pMaterial);
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+
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+
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+ group = new THREE.Object3D();
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+
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+ // add it to the scene
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+ group.add(pointCloud);
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+
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+ geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
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+ geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
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+
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+ geometry.computeBoundingSphere();
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+
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+ geometry.drawcalls.push( {
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+ start: 0,
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+ count: 0,
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+ index: 0
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+ } );
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+
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+ linesMesh = new THREE.Line( geometry, material, THREE.LinePieces );
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+ group.add( linesMesh );
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+
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+ scene.add(group);
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+
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+ //
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio )
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ renderer.gammaInput = true;
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+ renderer.gammaOutput = true;
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+
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+ container.appendChild( renderer.domElement );
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+
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+ //
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+
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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.top = '0px';
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+ container.appendChild( stats.domElement );
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ //
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+ var numConnected;
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+
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+ function animate() {
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+
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+ var vertexpos=0;
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+ var colorpos=0;
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+ numConnected = 0;
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+
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+ for (var i = 0; i < particleCount; i++)
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+ particlesData[i].numConnections = 0;
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+
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+ for (var i = 0; i < particleCount; i++) {
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+
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+ // get the particle
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+ var particleData = particlesData[i];
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+
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+ particlePositions[i*3]+=particleData.velocity.x;
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+ particlePositions[i*3+1]+=particleData.velocity.y;
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+ particlePositions[i*3+2]+=particleData.velocity.z;
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+
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+ if (particlePositions[i*3+1]<-rHalf || particlePositions[i*3+1]>rHalf)
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+ particleData.velocity.y=-particleData.velocity.y;
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+
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+ if (particlePositions[i*3]<-rHalf || particlePositions[i*3]>rHalf)
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+ particleData.velocity.x=-particleData.velocity.x;
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+
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+ if (particlePositions[i*3+2]<-rHalf || particlePositions[i*3+2]>rHalf)
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+ particleData.velocity.z=-particleData.velocity.z;
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+
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+ //if (effectController.maxConnections
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+ if (effectController.limitConnections && particleData.numConnections >= effectController.maxConnections)
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+ continue;
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+
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+ // Check collision
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+ for (var j = i+1; j < particleCount; j++) {
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+
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+ var particleDataB = particlesData[j];
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+ if (effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections)
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+ continue;
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+
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+ var dx = particlePositions[i*3] - particlePositions[j*3];
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+ var dy = particlePositions[i*3+1] - particlePositions[j*3+1];
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+ var dz = particlePositions[i*3+2] - particlePositions[j*3+2];
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+ var dist = Math.sqrt(dx*dx+dy*dy+dz*dz);
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+
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+ //var dist = particle.distanceTo(particleB);
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+
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+ if (dist < effectController.minDistance) {
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+
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+ particleData.numConnections++;
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+ particleDataB.numConnections++;
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+
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+ var alpha = 1.0-dist/effectController.minDistance+0.2;
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+
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+ positions[ vertexpos++ ] = particlePositions[i*3];
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+ positions[ vertexpos++ ] = particlePositions[i*3+1];
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+ positions[ vertexpos++ ] = particlePositions[i*3+2];
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+
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+ positions[ vertexpos++ ] = particlePositions[j*3];
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+ positions[ vertexpos++ ] = particlePositions[j*3+1];
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+ positions[ vertexpos++ ] = particlePositions[j*3+2];
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+
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+
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+ colors[ colorpos++ ] = alpha;
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+ colors[ colorpos++ ] = alpha;
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+ colors[ colorpos++ ] = alpha;
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+
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+ colors[ colorpos++ ] = alpha;
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+ colors[ colorpos++ ] = alpha;
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+ colors[ colorpos++ ] = alpha;
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+
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+ numConnected++;
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+ }
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+ }
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+ }
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+
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+
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+ linesMesh.geometry.drawcalls[0].count = numConnected*2;
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+ linesMesh.geometry.attributes.position.needsUpdate = true;
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+ linesMesh.geometry.attributes.color.needsUpdate = true;
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+
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+ pointCloud.geometry.attributes.position.needsUpdate = true;
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+
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+ requestAnimationFrame( animate );
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+
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+ stats.update();
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+ render();
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+
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+ }
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+
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+ function render() {
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+
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+ var time = Date.now() * 0.001;
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+
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+ group.rotation.y = time*0.1;
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Fernando Serrano