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302 lines
8.4 KiB
302 lines
8.4 KiB
3 years ago
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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 drawrange</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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</head>
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<body>
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<div id="container"></div>
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<div id="info">
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<a href="https://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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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let group;
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let container, stats;
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const particlesData = [];
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let camera, scene, renderer;
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let positions, colors;
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let particles;
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let pointCloud;
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let particlePositions;
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let linesMesh;
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const maxParticleCount = 1000;
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let particleCount = 500;
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const r = 800;
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const rHalf = r / 2;
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const 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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init();
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animate();
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function initGUI() {
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const gui = new GUI();
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gui.add( effectController, 'showDots' ).onChange( function ( value ) {
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pointCloud.visible = value;
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} );
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gui.add( effectController, 'showLines' ).onChange( function ( value ) {
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linesMesh.visible = value;
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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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particleCount = parseInt( value );
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particles.setDrawRange( 0, particleCount );
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} );
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}
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function init() {
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initGUI();
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container = document.getElementById( 'container' );
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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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const controls = new OrbitControls( camera, container );
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controls.minDistance = 1000;
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controls.maxDistance = 3000;
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scene = new THREE.Scene();
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group = new THREE.Group();
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scene.add( group );
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const helper = new THREE.BoxHelper( new THREE.Mesh( new THREE.BoxGeometry( 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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const segments = maxParticleCount * maxParticleCount;
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positions = new Float32Array( segments * 3 );
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colors = new Float32Array( segments * 3 );
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const 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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particles = new THREE.BufferGeometry();
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particlePositions = new Float32Array( maxParticleCount * 3 );
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for ( let i = 0; i < maxParticleCount; i ++ ) {
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const x = Math.random() * r - r / 2;
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const y = Math.random() * r - r / 2;
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const z = Math.random() * r - r / 2;
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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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// 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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particles.setDrawRange( 0, particleCount );
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particles.setAttribute( 'position', new THREE.BufferAttribute( particlePositions, 3 ).setUsage( THREE.DynamicDrawUsage ) );
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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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const geometry = new THREE.BufferGeometry();
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geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ).setUsage( THREE.DynamicDrawUsage ) );
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geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ).setUsage( THREE.DynamicDrawUsage ) );
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geometry.computeBoundingSphere();
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geometry.setDrawRange( 0, 0 );
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const material = new THREE.LineBasicMaterial( {
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vertexColors: true,
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blending: THREE.AdditiveBlending,
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transparent: true
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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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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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renderer.outputEncoding = THREE.sRGBEncoding;
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container.appendChild( renderer.domElement );
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//
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stats = new Stats();
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container.appendChild( stats.dom );
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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let vertexpos = 0;
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let colorpos = 0;
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let numConnected = 0;
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for ( let i = 0; i < particleCount; i ++ )
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particlesData[ i ].numConnections = 0;
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for ( let i = 0; i < particleCount; i ++ ) {
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// get the particle
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const particleData = particlesData[ i ];
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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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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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if ( particlePositions[ i * 3 ] < - rHalf || particlePositions[ i * 3 ] > rHalf )
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particleData.velocity.x = - particleData.velocity.x;
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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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if ( effectController.limitConnections && particleData.numConnections >= effectController.maxConnections )
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continue;
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// Check collision
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for ( let j = i + 1; j < particleCount; j ++ ) {
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const particleDataB = particlesData[ j ];
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if ( effectController.limitConnections && particleDataB.numConnections >= effectController.maxConnections )
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continue;
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const dx = particlePositions[ i * 3 ] - particlePositions[ j * 3 ];
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const dy = particlePositions[ i * 3 + 1 ] - particlePositions[ j * 3 + 1 ];
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const dz = particlePositions[ i * 3 + 2 ] - particlePositions[ j * 3 + 2 ];
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const dist = Math.sqrt( dx * dx + dy * dy + dz * dz );
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if ( dist < effectController.minDistance ) {
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particleData.numConnections ++;
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particleDataB.numConnections ++;
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const alpha = 1.0 - dist / effectController.minDistance;
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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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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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colors[ colorpos ++ ] = alpha;
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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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colors[ colorpos ++ ] = alpha;
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colors[ colorpos ++ ] = alpha;
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numConnected ++;
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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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pointCloud.geometry.attributes.position.needsUpdate = true;
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requestAnimationFrame( animate );
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stats.update();
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render();
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}
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function render() {
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const time = Date.now() * 0.001;
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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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</script>
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</body>
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</html>
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