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.
170 lines
4.1 KiB
170 lines
4.1 KiB
2 years ago
|
<!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>three.js webgl - buffergeometry - particles</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 - particles</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';
|
||
|
|
|
||
|
|
let container, stats;
|
||
|
|
|
||
|
|
let camera, scene, renderer;
|
||
|
|
|
||
|
|
let points;
|
||
|
|
|
||
|
|
init();
|
||
|
|
animate();
|
||
|
|
|
||
|
|
function init() {
|
||
|
|
|
||
|
|
container = document.getElementById( 'container' );
|
||
|
|
|
||
|
|
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 5, 3500 );
|
||
|
|
camera.position.z = 2750;
|
||
|
|
|
||
|
|
scene = new THREE.Scene();
|
||
|
|
scene.background = new THREE.Color( 0x050505 );
|
||
|
|
scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
const particles = 500000;
|
||
|
|
|
||
|
|
const geometry = new THREE.BufferGeometry();
|
||
|
|
|
||
|
|
// create a generic buffer of binary data (a single particle has 16 bytes of data)
|
||
|
|
|
||
|
|
const arrayBuffer = new ArrayBuffer( particles * 16 );
|
||
|
|
|
||
|
|
// the following typed arrays share the same buffer
|
||
|
|
|
||
|
|
const interleavedFloat32Buffer = new Float32Array( arrayBuffer );
|
||
|
|
const interleavedUint8Buffer = new Uint8Array( arrayBuffer );
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
const color = new THREE.Color();
|
||
|
|
|
||
|
|
const n = 1000, n2 = n / 2; // particles spread in the cube
|
||
|
|
|
||
|
|
for ( let i = 0; i < interleavedFloat32Buffer.length; i += 4 ) {
|
||
|
|
|
||
|
|
// position (first 12 bytes)
|
||
|
|
|
||
|
|
const x = Math.random() * n - n2;
|
||
|
|
const y = Math.random() * n - n2;
|
||
|
|
const z = Math.random() * n - n2;
|
||
|
|
|
||
|
|
interleavedFloat32Buffer[ i + 0 ] = x;
|
||
|
|
interleavedFloat32Buffer[ i + 1 ] = y;
|
||
|
|
interleavedFloat32Buffer[ i + 2 ] = z;
|
||
|
|
|
||
|
|
// color (last 4 bytes)
|
||
|
|
|
||
|
|
const vx = ( x / n ) + 0.5;
|
||
|
|
const vy = ( y / n ) + 0.5;
|
||
|
|
const vz = ( z / n ) + 0.5;
|
||
|
|
|
||
|
|
color.setRGB( vx, vy, vz );
|
||
|
|
|
||
|
|
const j = ( i + 3 ) * 4;
|
||
|
|
|
||
|
|
interleavedUint8Buffer[ j + 0 ] = color.r * 255;
|
||
|
|
interleavedUint8Buffer[ j + 1 ] = color.g * 255;
|
||
|
|
interleavedUint8Buffer[ j + 2 ] = color.b * 255;
|
||
|
|
interleavedUint8Buffer[ j + 3 ] = 0; // not needed
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const interleavedBuffer32 = new THREE.InterleavedBuffer( interleavedFloat32Buffer, 4 );
|
||
|
|
const interleavedBuffer8 = new THREE.InterleavedBuffer( interleavedUint8Buffer, 16 );
|
||
|
|
|
||
|
|
geometry.setAttribute( 'position', new THREE.InterleavedBufferAttribute( interleavedBuffer32, 3, 0, false ) );
|
||
|
|
geometry.setAttribute( 'color', new THREE.InterleavedBufferAttribute( interleavedBuffer8, 3, 12, true ) );
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
const material = new THREE.PointsMaterial( { size: 15, vertexColors: true } );
|
||
|
|
|
||
|
|
points = new THREE.Points( geometry, material );
|
||
|
|
scene.add( points );
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
renderer = new THREE.WebGLRenderer();
|
||
|
|
renderer.setPixelRatio( window.devicePixelRatio );
|
||
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
||
|
|
|
||
|
|
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() {
|
||
|
|
|
||
|
|
requestAnimationFrame( animate );
|
||
|
|
|
||
|
|
render();
|
||
|
|
stats.update();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
function render() {
|
||
|
|
|
||
|
|
const time = Date.now() * 0.001;
|
||
|
|
|
||
|
|
points.rotation.x = time * 0.25;
|
||
|
|
points.rotation.y = time * 0.5;
|
||
|
|
|
||
|
|
renderer.render( scene, camera );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
</script>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|