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194 lines
4.3 KiB
194 lines
4.3 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 - buffer geometry custom attributes - particles</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"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry custom attributes - particles</div>
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<script type="x-shader/x-vertex" id="vertexshader">
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attribute float size;
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varying vec3 vColor;
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void main() {
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vColor = color;
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vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
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gl_PointSize = size * ( 300.0 / -mvPosition.z );
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gl_Position = projectionMatrix * mvPosition;
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}
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</script>
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<script type="x-shader/x-fragment" id="fragmentshader">
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uniform sampler2D pointTexture;
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varying vec3 vColor;
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void main() {
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gl_FragColor = vec4( vColor, 1.0 );
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gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );
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}
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</script>
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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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let renderer, scene, camera, stats;
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let particleSystem, uniforms, geometry;
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const particles = 100000;
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.z = 300;
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scene = new THREE.Scene();
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uniforms = {
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pointTexture: { value: new THREE.TextureLoader().load( 'textures/sprites/spark1.png' ) }
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};
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const shaderMaterial = new THREE.ShaderMaterial( {
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uniforms: uniforms,
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vertexShader: document.getElementById( 'vertexshader' ).textContent,
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fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
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blending: THREE.AdditiveBlending,
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depthTest: false,
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transparent: true,
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vertexColors: true
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} );
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const radius = 200;
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geometry = new THREE.BufferGeometry();
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const positions = [];
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const colors = [];
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const sizes = [];
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const color = new THREE.Color();
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for ( let i = 0; i < particles; i ++ ) {
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positions.push( ( Math.random() * 2 - 1 ) * radius );
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positions.push( ( Math.random() * 2 - 1 ) * radius );
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positions.push( ( Math.random() * 2 - 1 ) * radius );
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color.setHSL( i / particles, 1.0, 0.5 );
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colors.push( color.r, color.g, color.b );
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sizes.push( 20 );
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}
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geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
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geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
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geometry.setAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ).setUsage( THREE.DynamicDrawUsage ) );
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particleSystem = new THREE.Points( geometry, shaderMaterial );
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scene.add( particleSystem );
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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const container = document.getElementById( 'container' );
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container.appendChild( renderer.domElement );
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stats = new Stats();
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container.appendChild( stats.dom );
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//
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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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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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const time = Date.now() * 0.005;
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particleSystem.rotation.z = 0.01 * time;
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const sizes = geometry.attributes.size.array;
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for ( let i = 0; i < particles; i ++ ) {
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sizes[ i ] = 10 * ( 1 + Math.sin( 0.1 * i + time ) );
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}
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geometry.attributes.size.needsUpdate = true;
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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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