javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js - gpu particle system</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> - GPU particle system plugin<br/>
			by <a href="http://charliehoey.com">Charlie Hoey</a>.
		</div>

		<script type="module">
			import {
				Clock,
				PerspectiveCamera,
				Scene,
				Vector3,
				WebGLRenderer
			} from "../build/three.module.js";

			import Stats from './jsm/libs/stats.module.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';

			import { TrackballControls } from './jsm/controls/TrackballControls.js';
			import { GPUParticleSystem } from './jsm/objects/GPUParticleSystem.js';

			var camera, tick = 0,
				scene, renderer, clock = new Clock(),
				controls, container, gui = new GUI( { width: 350 } ),
				options, spawnerOptions, particleSystem;

			var stats;

			init();
			animate();

			function init() {

				//

				container = document.getElementById( 'container' );

				camera = new PerspectiveCamera( 28, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 100;

				scene = new Scene();

				// The GPU Particle system extends THREE.Object3D, and so you can use it
				// as you would any other scene graph component.	Particle positions will be
				// relative to the position of the particle system, but you will probably only need one
				// system for your whole scene

				particleSystem = new GPUParticleSystem( {
					maxParticles: 250000
				} );

				scene.add( particleSystem );

				// options passed during each spawned

				options = {
					position: new Vector3(),
					positionRandomness: .3,
					velocity: new Vector3(),
					velocityRandomness: .5,
					color: 0xaa88ff,
					colorRandomness: .2,
					turbulence: .5,
					lifetime: 2,
					size: 5,
					sizeRandomness: 1
				};

				spawnerOptions = {
					spawnRate: 15000,
					horizontalSpeed: 1.5,
					verticalSpeed: 1.33,
					timeScale: 1
				};

				//

				gui.add( options, "velocityRandomness", 0, 3 );
				gui.add( options, "positionRandomness", 0, 3 );
				gui.add( options, "size", 1, 20 );
				gui.add( options, "sizeRandomness", 0, 25 );
				gui.add( options, "colorRandomness", 0, 1 );
				gui.add( options, "lifetime", .1, 10 );
				gui.add( options, "turbulence", 0, 1 );

				gui.add( spawnerOptions, "spawnRate", 10, 30000 );
				gui.add( spawnerOptions, "timeScale", - 1, 1 );

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				renderer = new WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				//

				controls = new TrackballControls( camera, renderer.domElement );
				controls.rotateSpeed = 5.0;
				controls.zoomSpeed = 2.2;
				controls.panSpeed = 1;
				controls.dynamicDampingFactor = 0.3;

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestAnimationFrame( animate );

				controls.update();

				var delta = clock.getDelta() * spawnerOptions.timeScale;

				tick += delta;

				if ( tick < 0 ) tick = 0;

				if ( delta > 0 ) {

					options.position.x = Math.sin( tick * spawnerOptions.horizontalSpeed ) * 20;
					options.position.y = Math.sin( tick * spawnerOptions.verticalSpeed ) * 10;
					options.position.z = Math.sin( tick * spawnerOptions.horizontalSpeed + spawnerOptions.verticalSpeed ) * 5;

					for ( var x = 0; x < spawnerOptions.spawnRate * delta; x ++ ) {

						// Yep, that's really it.	Spawning particles is super cheap, and once you spawn them, the rest of
						// their lifecycle is handled entirely on the GPU, driven by a time uniform updated below

						particleSystem.spawnParticle( options );

					}

				}

				particleSystem.update( tick );

				render();

				stats.update();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>