You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
301 lines
8.4 KiB
301 lines
8.4 KiB
<!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>
|
|
|
|
<!-- Import maps polyfill -->
|
|
<!-- Remove this when import maps will be widely supported -->
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
|
|
|
|
<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();
|
|
animate();
|
|
|
|
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 = 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;
|
|
|
|
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( 0x101010 );
|
|
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.outputEncoding = THREE.sRGBEncoding;
|
|
|
|
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;
|
|
|
|
requestAnimationFrame( animate );
|
|
|
|
stats.update();
|
|
render();
|
|
|
|
}
|
|
|
|
function render() {
|
|
|
|
const time = Date.now() * 0.001;
|
|
|
|
group.rotation.y = time * 0.1;
|
|
renderer.render( scene, camera );
|
|
|
|
}
|
|
|
|
</script>
|
|
</body>
|
|
</html>
|
|
|