|
@@ -0,0 +1,302 @@
|
|
|
|
|
+<!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 linesMesh;
|
|
|
|
|
+
|
|
|
|
|
+ var maxParticleCount = 1000;
|
|
|
|
|
+ var particleCount = 500;
|
|
|
|
|
+ var r = 800;
|
|
|
|
|
+ var rHalf = r / 2;
|
|
|
|
|
+
|
|
|
|
|
+ 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.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 );
|
|
|
|
|
+
|
|
|
|
|
+ }
|
|
|
|
|
+
|
|
|
|
|
+ function animate() {
|
|
|
|
|
+
|
|
|
|
|
+ var vertexpos = 0;
|
|
|
|
|
+ var colorpos = 0;
|
|
|
|
|
+ var 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.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 );
|
|
|
|
|
+
|
|
|
|
|
+ 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>
|
Mr.doob