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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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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ <style>
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+ a {
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+ color: #08f;
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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" rel="noopener">three.js</a> webgl - buffergeometry drawrange<br/>
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+ by <a href="https://twitter.com/fernandojsg">fernandojsg</a>
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+ </div>
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+
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+ <script type="module">
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+
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+ import * as THREE from '../build/three.module.js';
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+
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+ import Stats from './jsm/libs/stats.module.js';
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+ import { GUI } from './jsm/libs/dat.gui.module.js';
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+
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+ import { OrbitControls } from './jsm/controls/OrbitControls.js';
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+
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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 particles;
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+ var pointCloud;
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+ var particlePositions;
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+ var linesMesh;
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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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+ var rHalf = r / 2;
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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 GUI();
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+
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+ gui.add( effectController, "showDots" ).onChange( function ( value ) {
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+
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+ pointCloud.visible = value;
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+
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+ } );
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+ gui.add( effectController, "showLines" ).onChange( function ( value ) {
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+
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+ linesMesh.visible = value;
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+
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+ } );
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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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+
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+ particleCount = parseInt( value );
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+ particles.setDrawRange( 0, particleCount );
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+
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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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+
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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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+ 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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+ var controls = new OrbitControls( camera, container );
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+
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+ scene = new THREE.Scene();
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+
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+
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+ group = new THREE.Group();
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+ scene.add( group );
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+
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+ var helper = new THREE.BoxHelper( new THREE.Mesh( new THREE.BoxBufferGeometry( r, r, r ) ) );
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+ helper.material.color.setHex( 0x101010 );
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+ helper.material.blending = THREE.AdditiveBlending;
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+ helper.material.transparent = true;
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+ group.add( helper );
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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.PointsMaterial( {
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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.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.setDrawRange( 0, particleCount );
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+ particles.addAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ).setDynamic( true ) );
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+
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+ // create the particle system
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+ pointCloud = new THREE.Points( particles, pMaterial );
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+ group.add( pointCloud );
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+
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+ var geometry = new THREE.BufferGeometry();
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+
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+ geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ).setDynamic( true ) );
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+ geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ).setDynamic( true ) );
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+
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+ geometry.computeBoundingSphere();
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+
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+ geometry.setDrawRange( 0, 0 );
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+
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+ var material = new THREE.LineBasicMaterial( {
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+ vertexColors: THREE.VertexColors,
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+ blending: THREE.AdditiveBlending,
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+ transparent: true
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+ } );
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+
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+ linesMesh = new THREE.LineSegments( geometry, material );
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+ group.add( linesMesh );
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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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+ container.appendChild( stats.dom );
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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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+ function animate() {
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+
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+ var vertexpos = 0;
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+ var colorpos = 0;
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+ var 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.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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+ 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;
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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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+ 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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+ }
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+
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+
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+ linesMesh.geometry.setDrawRange( 0, 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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+ </body>
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+</html>
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Fernando Serrano