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368 lines
11 KiB
HTML
368 lines
11 KiB
HTML
2 months ago
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<html lang="en">
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<head>
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<title>three.js - WebGPU - Compute Particles Rain</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> WebGPU - GPU Compute Rain
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</div>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.webgpu.js",
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"three/webgpu": "../build/three.webgpu.js",
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"three/tsl": "../build/three.tsl.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 { Fn, texture, uv, uint, instancedArray, positionWorld, billboarding, time, hash, deltaTime, vec2, instanceIndex, positionGeometry, If } from 'three/tsl';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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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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import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
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const maxParticleCount = 50000;
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const instanceCount = maxParticleCount / 2;
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let camera, scene, renderer;
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let controls, stats;
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let computeParticles;
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let monkey;
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let clock;
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let collisionBox, collisionCamera, collisionPosRT, collisionPosMaterial;
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let collisionBoxPos, collisionBoxPosUI;
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init();
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function init() {
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const { innerWidth, innerHeight } = window;
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camera = new THREE.PerspectiveCamera( 60, innerWidth / innerHeight, .1, 110 );
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camera.position.set( 40, 8, 0 );
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camera.lookAt( 0, 0, 0 );
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scene = new THREE.Scene();
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const dirLight = new THREE.DirectionalLight( 0xffffff, .5 );
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dirLight.castShadow = true;
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dirLight.position.set( 3, 17, 17 );
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dirLight.castShadow = true;
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dirLight.shadow.camera.near = 1;
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dirLight.shadow.camera.far = 50;
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dirLight.shadow.camera.right = 25;
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dirLight.shadow.camera.left = - 25;
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dirLight.shadow.camera.top = 25;
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dirLight.shadow.camera.bottom = - 25;
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dirLight.shadow.mapSize.width = 2048;
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dirLight.shadow.mapSize.height = 2048;
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dirLight.shadow.bias = - 0.01;
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scene.add( dirLight );
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scene.add( new THREE.AmbientLight( 0x111111 ) );
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//
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collisionCamera = new THREE.OrthographicCamera( - 50, 50, 50, - 50, .1, 50 );
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collisionCamera.position.y = 50;
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collisionCamera.lookAt( 0, 0, 0 );
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collisionCamera.layers.disableAll();
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collisionCamera.layers.enable( 1 );
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collisionPosRT = new THREE.RenderTarget( 1024, 1024 );
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collisionPosRT.texture.type = THREE.HalfFloatType;
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collisionPosRT.texture.magFilter = THREE.NearestFilter;
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collisionPosRT.texture.minFilter = THREE.NearestFilter;
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collisionPosRT.texture.generateMipmaps = false;
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collisionPosMaterial = new THREE.MeshBasicNodeMaterial();
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collisionPosMaterial.colorNode = positionWorld;
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//
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const positionBuffer = instancedArray( maxParticleCount, 'vec3' );
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const velocityBuffer = instancedArray( maxParticleCount, 'vec3' );
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const ripplePositionBuffer = instancedArray( maxParticleCount, 'vec3' );
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const rippleTimeBuffer = instancedArray( maxParticleCount, 'vec3' );
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// compute
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const randUint = () => uint( Math.random() * 0xFFFFFF );
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const computeInit = Fn( () => {
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const position = positionBuffer.element( instanceIndex );
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const velocity = velocityBuffer.element( instanceIndex );
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const rippleTime = rippleTimeBuffer.element( instanceIndex );
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const randX = hash( instanceIndex );
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const randY = hash( instanceIndex.add( randUint() ) );
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const randZ = hash( instanceIndex.add( randUint() ) );
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position.x = randX.mul( 100 ).add( - 50 );
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position.y = randY.mul( 25 );
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position.z = randZ.mul( 100 ).add( - 50 );
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velocity.y = randX.mul( - .04 ).add( - .2 );
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rippleTime.x = 1000;
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} )().compute( maxParticleCount );
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//
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const computeUpdate = Fn( () => {
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const getCoord = ( pos ) => pos.add( 50 ).div( 100 );
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const position = positionBuffer.element( instanceIndex );
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const velocity = velocityBuffer.element( instanceIndex );
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const ripplePosition = ripplePositionBuffer.element( instanceIndex );
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const rippleTime = rippleTimeBuffer.element( instanceIndex );
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position.addAssign( velocity );
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rippleTime.x = rippleTime.x.add( deltaTime.mul( 4 ) );
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//
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const collisionArea = texture( collisionPosRT.texture, getCoord( position.xz ) );
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const surfaceOffset = .05;
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const floorPosition = collisionArea.y.add( surfaceOffset );
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// floor
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const ripplePivotOffsetY = - .9;
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If( position.y.add( ripplePivotOffsetY ).lessThan( floorPosition ), () => {
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position.y = 25;
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ripplePosition.xz = position.xz;
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ripplePosition.y = floorPosition;
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// reset hit time: x = time
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rippleTime.x = 1;
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// next drops will not fall in the same place
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position.x = hash( instanceIndex.add( time ) ).mul( 100 ).add( - 50 );
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position.z = hash( instanceIndex.add( time.add( randUint() ) ) ).mul( 100 ).add( - 50 );
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} );
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const rippleOnSurface = texture( collisionPosRT.texture, getCoord( ripplePosition.xz ) );
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const rippleFloorArea = rippleOnSurface.y.add( surfaceOffset );
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If( ripplePosition.y.greaterThan( rippleFloorArea ), () => {
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rippleTime.x = 1000;
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} );
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} );
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computeParticles = computeUpdate().compute( maxParticleCount );
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// rain
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const rainMaterial = new THREE.MeshBasicNodeMaterial();
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rainMaterial.colorNode = uv().distance( vec2( .5, 0 ) ).oneMinus().mul( 3 ).exp().mul( .1 );
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rainMaterial.vertexNode = billboarding( { position: positionBuffer.toAttribute() } );
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rainMaterial.opacity = .2;
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rainMaterial.side = THREE.DoubleSide;
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rainMaterial.forceSinglePass = true;
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rainMaterial.depthWrite = false;
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rainMaterial.depthTest = true;
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rainMaterial.transparent = true;
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const rainParticles = new THREE.Mesh( new THREE.PlaneGeometry( .1, 2 ), rainMaterial );
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rainParticles.count = instanceCount;
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scene.add( rainParticles );
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// ripple
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const rippleTime = rippleTimeBuffer.element( instanceIndex ).x;
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const rippleEffect = Fn( () => {
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const center = uv().add( vec2( - .5 ) ).length().mul( 7 );
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const distance = rippleTime.sub( center );
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return distance.min( 1 ).sub( distance.max( 1 ).sub( 1 ) );
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} );
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const rippleMaterial = new THREE.MeshBasicNodeMaterial();
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rippleMaterial.colorNode = rippleEffect();
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rippleMaterial.positionNode = positionGeometry.add( ripplePositionBuffer.toAttribute() );
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rippleMaterial.opacityNode = rippleTime.mul( .3 ).oneMinus().max( 0 ).mul( .5 );
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rippleMaterial.side = THREE.DoubleSide;
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rippleMaterial.forceSinglePass = true;
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rippleMaterial.depthWrite = false;
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rippleMaterial.depthTest = true;
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rippleMaterial.transparent = true;
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// ripple geometry
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const surfaceRippleGeometry = new THREE.PlaneGeometry( 2.5, 2.5 );
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surfaceRippleGeometry.rotateX( - Math.PI / 2 );
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const xRippleGeometry = new THREE.PlaneGeometry( 1, 2 );
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xRippleGeometry.rotateY( - Math.PI / 2 );
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const zRippleGeometry = new THREE.PlaneGeometry( 1, 2 );
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const rippleGeometry = BufferGeometryUtils.mergeGeometries( [ surfaceRippleGeometry, xRippleGeometry, zRippleGeometry ] );
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const rippleParticles = new THREE.Mesh( rippleGeometry, rippleMaterial );
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rippleParticles.count = instanceCount;
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scene.add( rippleParticles );
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// floor geometry
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const floorGeometry = new THREE.PlaneGeometry( 1000, 1000 );
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floorGeometry.rotateX( - Math.PI / 2 );
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const plane = new THREE.Mesh( floorGeometry, new THREE.MeshBasicMaterial( { color: 0x050505 } ) );
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scene.add( plane );
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//
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collisionBox = new THREE.Mesh( new THREE.BoxGeometry( 30, 1, 15 ), new THREE.MeshStandardMaterial() );
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collisionBox.material.color.set( 0x333333 );
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collisionBox.position.y = 12;
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collisionBox.scale.x = 3.5;
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collisionBox.layers.enable( 1 );
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collisionBox.castShadow = true;
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scene.add( collisionBox );
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//
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const loader = new THREE.BufferGeometryLoader();
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loader.load( 'models/json/suzanne_buffergeometry.json', function ( geometry ) {
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geometry.computeVertexNormals();
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monkey = new THREE.Mesh( geometry, new THREE.MeshStandardMaterial( { roughness: 1, metalness: 0 } ) );
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monkey.receiveShadow = true;
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monkey.scale.setScalar( 5 );
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monkey.rotation.y = Math.PI / 2;
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monkey.position.y = 4.5;
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monkey.layers.enable( 1 ); // add to collision layer
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scene.add( monkey );
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} );
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//
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clock = new THREE.Clock();
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//
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renderer = new THREE.WebGPURenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.setAnimationLoop( animate );
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document.body.appendChild( renderer.domElement );
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stats = new Stats();
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document.body.appendChild( stats.dom );
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//
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renderer.computeAsync( computeInit );
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//
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controls = new OrbitControls( camera, renderer.domElement );
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controls.minDistance = 5;
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controls.maxDistance = 50;
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controls.update();
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//
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window.addEventListener( 'resize', onWindowResize );
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// gui
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const gui = new GUI();
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// use lerp to smooth the movement
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collisionBoxPosUI = new THREE.Vector3().copy( collisionBox.position );
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collisionBoxPos = new THREE.Vector3();
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gui.add( collisionBoxPosUI, 'z', - 50, 50, .001 ).name( 'position' );
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gui.add( collisionBox.scale, 'x', .1, 3.5, 0.01 ).name( 'scale' );
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gui.add( rainParticles, 'count', 200, maxParticleCount, 1 ).name( 'drop count' ).onChange( ( v ) => rippleParticles.count = v );
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}
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function onWindowResize() {
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const { innerWidth, innerHeight } = window;
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camera.aspect = innerWidth / innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( innerWidth, innerHeight );
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}
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function animate() {
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stats.update();
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const delta = clock.getDelta();
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if ( monkey ) {
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monkey.rotation.y += delta;
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}
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collisionBoxPos.set( collisionBoxPosUI.x, collisionBoxPosUI.y, - collisionBoxPosUI.z );
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collisionBox.position.lerp( collisionBoxPos, 10 * delta );
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// position
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scene.overrideMaterial = collisionPosMaterial;
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renderer.setRenderTarget( collisionPosRT );
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renderer.render( scene, collisionCamera );
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// compute
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renderer.compute( computeParticles );
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// result
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scene.overrideMaterial = null;
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renderer.setRenderTarget( null );
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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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