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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - buffergeometry - lines drawrange</title>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
- <link type="text/css" rel="stylesheet" href="main.css">
- </head>
- <body>
- <div id="container"></div>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry drawrange<br/>
- by <a href="https://twitter.com/fernandojsg">fernandojsg</a>
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import Stats from 'three/addons/libs/stats.module.js';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- let group;
- let container, stats;
- const particlesData = [];
- let camera, scene, renderer;
- let positions, colors;
- let particles;
- let pointCloud;
- let particlePositions;
- let linesMesh;
- const maxParticleCount = 1000;
- let particleCount = 500;
- const r = 800;
- const rHalf = r / 2;
- const effectController = {
- showDots: true,
- showLines: true,
- minDistance: 150,
- limitConnections: false,
- maxConnections: 20,
- particleCount: 500
- };
- init();
- function initGUI() {
- const gui = new 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 = value;
- particles.setDrawRange( 0, particleCount );
- } );
- }
- function init() {
- initGUI();
- container = document.getElementById( 'container' );
- camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 4000 );
- camera.position.z = 1750;
- const controls = new OrbitControls( camera, container );
- controls.minDistance = 1000;
- controls.maxDistance = 3000;
- scene = new THREE.Scene();
- group = new THREE.Group();
- scene.add( group );
- const helper = new THREE.BoxHelper( new THREE.Mesh( new THREE.BoxGeometry( r, r, r ) ) );
- helper.material.color.setHex( 0x474747 );
- helper.material.blending = THREE.AdditiveBlending;
- helper.material.transparent = true;
- group.add( helper );
- const segments = maxParticleCount * maxParticleCount;
- positions = new Float32Array( segments * 3 );
- colors = new Float32Array( segments * 3 );
- const pMaterial = new THREE.PointsMaterial( {
- color: 0xFFFFFF,
- size: 3,
- blending: THREE.AdditiveBlending,
- transparent: true,
- sizeAttenuation: false
- } );
- particles = new THREE.BufferGeometry();
- particlePositions = new Float32Array( maxParticleCount * 3 );
- for ( let i = 0; i < maxParticleCount; i ++ ) {
- const x = Math.random() * r - r / 2;
- const y = Math.random() * r - r / 2;
- const 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.setDrawRange( 0, particleCount );
- particles.setAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ).setUsage( THREE.DynamicDrawUsage ) );
- // create the particle system
- pointCloud = new THREE.Points( particles, pMaterial );
- group.add( pointCloud );
- const geometry = new THREE.BufferGeometry();
- geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ).setUsage( THREE.DynamicDrawUsage ) );
- geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ).setUsage( THREE.DynamicDrawUsage ) );
- geometry.computeBoundingSphere();
- geometry.setDrawRange( 0, 0 );
- const material = new THREE.LineBasicMaterial( {
- vertexColors: true,
- blending: THREE.AdditiveBlending,
- transparent: true
- } );
- linesMesh = new THREE.LineSegments( geometry, material );
- group.add( linesMesh );
- //
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- container.appendChild( renderer.domElement );
- //
- stats = new Stats();
- container.appendChild( stats.dom );
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function animate() {
- let vertexpos = 0;
- let colorpos = 0;
- let numConnected = 0;
- for ( let i = 0; i < particleCount; i ++ )
- particlesData[ i ].numConnections = 0;
- for ( let i = 0; i < particleCount; i ++ ) {
- // get the particle
- const 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 ( let j = i + 1; j < particleCount; j ++ ) {
- const particleDataB = particlesData[ j ];
- if ( effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections )
- continue;
- const dx = particlePositions[ i * 3 ] - particlePositions[ j * 3 ];
- const dy = particlePositions[ i * 3 + 1 ] - particlePositions[ j * 3 + 1 ];
- const dz = particlePositions[ i * 3 + 2 ] - particlePositions[ j * 3 + 2 ];
- const dist = Math.sqrt( dx * dx + dy * dy + dz * dz );
- if ( dist < effectController.minDistance ) {
- particleData.numConnections ++;
- particleDataB.numConnections ++;
- const alpha = 1.0 - dist / effectController.minDistance;
- 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.setDrawRange( 0, numConnected * 2 );
- linesMesh.geometry.attributes.position.needsUpdate = true;
- linesMesh.geometry.attributes.color.needsUpdate = true;
- pointCloud.geometry.attributes.position.needsUpdate = true;
- render();
- stats.update();
- }
- function render() {
- const time = Date.now() * 0.001;
- group.rotation.y = time * 0.1;
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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