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217 lines
5.3 KiB
217 lines
5.3 KiB
2 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 - particles - sprites</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="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl particle sprites example<br/>
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snowflakes by <a href="http://en.wikipedia.org/wiki/File:Sketch_of_snow_crystal_by_Ren%C3%A9_Descartes.jpg">René Descartes</a>
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</div>
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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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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let camera, scene, renderer, stats, parameters;
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let mouseX = 0, mouseY = 0;
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let windowHalfX = window.innerWidth / 2;
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let windowHalfY = window.innerHeight / 2;
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const materials = [];
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 2000 );
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camera.position.z = 1000;
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scene = new THREE.Scene();
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scene.fog = new THREE.FogExp2( 0x000000, 0.0008 );
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const geometry = new THREE.BufferGeometry();
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const vertices = [];
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const textureLoader = new THREE.TextureLoader();
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const sprite1 = textureLoader.load( 'textures/sprites/snowflake1.png' );
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const sprite2 = textureLoader.load( 'textures/sprites/snowflake2.png' );
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const sprite3 = textureLoader.load( 'textures/sprites/snowflake3.png' );
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const sprite4 = textureLoader.load( 'textures/sprites/snowflake4.png' );
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const sprite5 = textureLoader.load( 'textures/sprites/snowflake5.png' );
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for ( let i = 0; i < 10000; i ++ ) {
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const x = Math.random() * 2000 - 1000;
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const y = Math.random() * 2000 - 1000;
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const z = Math.random() * 2000 - 1000;
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vertices.push( x, y, z );
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}
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geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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parameters = [
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[[ 1.0, 0.2, 0.5 ], sprite2, 20 ],
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[[ 0.95, 0.1, 0.5 ], sprite3, 15 ],
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[[ 0.90, 0.05, 0.5 ], sprite1, 10 ],
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[[ 0.85, 0, 0.5 ], sprite5, 8 ],
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[[ 0.80, 0, 0.5 ], sprite4, 5 ]
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];
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for ( let i = 0; i < parameters.length; i ++ ) {
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const color = parameters[ i ][ 0 ];
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const sprite = parameters[ i ][ 1 ];
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const size = parameters[ i ][ 2 ];
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materials[ i ] = new THREE.PointsMaterial( { size: size, map: sprite, blending: THREE.AdditiveBlending, depthTest: false, transparent: true } );
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materials[ i ].color.setHSL( color[ 0 ], color[ 1 ], color[ 2 ] );
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const particles = new THREE.Points( geometry, materials[ i ] );
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particles.rotation.x = Math.random() * 6;
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particles.rotation.y = Math.random() * 6;
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particles.rotation.z = Math.random() * 6;
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scene.add( particles );
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}
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//
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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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document.body.appendChild( renderer.domElement );
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//
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stats = new Stats();
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document.body.appendChild( stats.dom );
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//
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const gui = new GUI();
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const params = {
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texture: true
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};
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gui.add( params, 'texture' ).onChange( function ( value ) {
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for ( let i = 0; i < materials.length; i ++ ) {
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materials[ i ].map = ( value === true ) ? parameters[ i ][ 1 ] : null;
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materials[ i ].needsUpdate = true;
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}
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} );
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gui.open();
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document.body.style.touchAction = 'none';
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document.body.addEventListener( 'pointermove', onPointerMove );
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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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windowHalfX = window.innerWidth / 2;
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windowHalfY = window.innerHeight / 2;
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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 onPointerMove( event ) {
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if ( event.isPrimary === false ) return;
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mouseX = event.clientX - windowHalfX;
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mouseY = event.clientY - windowHalfY;
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}
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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() * 0.00005;
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camera.position.x += ( mouseX - camera.position.x ) * 0.05;
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camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
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camera.lookAt( scene.position );
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for ( let i = 0; i < scene.children.length; i ++ ) {
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const object = scene.children[ i ];
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if ( object instanceof THREE.Points ) {
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object.rotation.y = time * ( i < 4 ? i + 1 : - ( i + 1 ) );
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}
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}
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for ( let i = 0; i < materials.length; i ++ ) {
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const color = parameters[ i ][ 0 ];
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const h = ( 360 * ( color[ 0 ] + time ) % 360 ) / 360;
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materials[ i ].color.setHSL( h, color[ 1 ], color[ 2 ] );
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}
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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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