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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - particles - billboards</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="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl particle billboards example
- </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';
- let camera, scene, renderer, stats, material;
- let mouseX = 0, mouseY = 0;
- let windowHalfX = window.innerWidth / 2;
- let windowHalfY = window.innerHeight / 2;
- init();
- function init() {
- camera = new THREE.PerspectiveCamera( 55, window.innerWidth / window.innerHeight, 2, 2000 );
- camera.position.z = 1000;
- scene = new THREE.Scene();
- scene.fog = new THREE.FogExp2( 0x000000, 0.001 );
- const geometry = new THREE.BufferGeometry();
- const vertices = [];
- const sprite = new THREE.TextureLoader().load( 'textures/sprites/disc.png' );
- sprite.colorSpace = THREE.SRGBColorSpace;
- for ( let i = 0; i < 10000; i ++ ) {
- const x = 2000 * Math.random() - 1000;
- const y = 2000 * Math.random() - 1000;
- const z = 2000 * Math.random() - 1000;
- vertices.push( x, y, z );
- }
- geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
- material = new THREE.PointsMaterial( { size: 35, sizeAttenuation: true, map: sprite, alphaTest: 0.5, transparent: true } );
- material.color.setHSL( 1.0, 0.3, 0.7, THREE.SRGBColorSpace );
- const particles = new THREE.Points( geometry, material );
- scene.add( particles );
- //
- renderer = new THREE.WebGLRenderer();
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- //
- stats = new Stats();
- document.body.appendChild( stats.dom );
- //
- const gui = new GUI();
- gui.add( material, 'sizeAttenuation' ).onChange( function () {
- material.needsUpdate = true;
- } );
- gui.open();
- //
- document.body.style.touchAction = 'none';
- document.body.addEventListener( 'pointermove', onPointerMove );
- //
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- windowHalfX = window.innerWidth / 2;
- windowHalfY = window.innerHeight / 2;
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function onPointerMove( event ) {
- if ( event.isPrimary === false ) return;
- mouseX = event.clientX - windowHalfX;
- mouseY = event.clientY - windowHalfY;
- }
- //
- function animate() {
- render();
- stats.update();
- }
- function render() {
- const time = Date.now() * 0.00005;
- camera.position.x += ( mouseX - camera.position.x ) * 0.05;
- camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
- camera.lookAt( scene.position );
- const h = ( 360 * ( 1.0 + time ) % 360 ) / 360;
- material.color.setHSL( h, 0.5, 0.5 );
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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