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webgl_buffergeometry_drawrange.html
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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">
<style>
a {
color: #08f;
}
</style>
</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="module">
import * as THREE from '../build/three.module.js';
import Stats from './jsm/libs/stats.module.js';
import { GUI } from './jsm/libs/dat.gui.module.js';
import { OrbitControls } from './jsm/controls/OrbitControls.js';
var group;
var container, stats;
var particlesData = [];
var camera, scene, renderer;
var positions, colors;
var particles;
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 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.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;
var controls = new OrbitControls( camera, container );
scene = new THREE.Scene();
group = new THREE.Group();
scene.add( group );
var helper = new THREE.BoxHelper( new THREE.Mesh( new THREE.BoxBufferGeometry( r, r, r ) ) );
helper.material.color.setHex( 0x101010 );
helper.material.blending = THREE.AdditiveBlending;
helper.material.transparent = true;
group.add( helper );
var segments = maxParticleCount * maxParticleCount;
positions = new Float32Array( segments * 3 );
colors = new Float32Array( segments * 3 );
var 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 ( 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.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 );
var 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 );
var 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.outputEncoding = THREE.sRGBEncoding;
container.appendChild( renderer.domElement );
//
stats = new Stats();
container.appendChild( stats.dom );
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;
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;
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>