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Improved webgpu_compute_particles example #31092

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Merged
merged 6 commits into from
May 14, 2025
Merged

Improved webgpu_compute_particles example #31092

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cdb1176
Improved webgpu_compute_particles example.
mrdoob May 13, 2025
a296568
Indentation fix.
mrdoob May 13, 2025
fd0f03c
Indentation fix.
mrdoob May 13, 2025
b6efd4d
Potential fix for code scanning alert no. 3517: Unused variable, impo…
mrdoob May 13, 2025
290ded7
Sprite instead of Mesh.
mrdoob May 14, 2025
70f49c3
Clean up.
mrdoob May 14, 2025
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109 changes: 58 additions & 51 deletions examples/webgpu_compute_particles.html
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Original file line number Diff line number Diff line change
Expand Up @@ -38,16 +38,17 @@
<script type="module">

import * as THREE from 'three';
import { Fn, uniform, texture, instancedArray, instanceIndex, float, hash, vec3, If } from 'three/tsl';
import { Fn, If, uniform, float, uv, vec2, vec3, hash,
instancedArray, instanceIndex } from 'three/tsl';

import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import Stats from 'three/addons/libs/stats.module.js';

import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

const particleCount = 500000;
const particleCount = 200_000;

const gravity = uniform( - .0098 );
const gravity = uniform( - .00098 );
const bounce = uniform( .8 );
const friction = uniform( .99 );
const size = uniform( .12 );
Expand All @@ -58,6 +59,8 @@
let controls, stats;
let computeParticles;

let isOrbitControlsActive;

const timestamps = document.getElementById( 'timestamps' );

init();
Expand All @@ -67,46 +70,44 @@
const { innerWidth, innerHeight } = window;

camera = new THREE.PerspectiveCamera( 50, innerWidth / innerHeight, .1, 1000 );
camera.position.set( 15, 30, 15 );
camera.position.set( 0, 5, 20 );

scene = new THREE.Scene();

// textures

const textureLoader = new THREE.TextureLoader();
const map = textureLoader.load( 'textures/sprite1.png' );

//

const positionBuffer = instancedArray( particleCount, 'vec3' );
const velocityBuffer = instancedArray( particleCount, 'vec3' );
const colorBuffer = instancedArray( particleCount, 'vec3' );
const positions = instancedArray( particleCount, 'vec3' );
const velocities = instancedArray( particleCount, 'vec3' );
const colors = instancedArray( particleCount, 'vec3' );

// compute

const separation = 0.2;
const amount = Math.sqrt( particleCount );
const offset = float( amount / 2 );

const computeInit = Fn( () => {

const position = positionBuffer.element( instanceIndex );
const color = colorBuffer.element( instanceIndex );

const randX = hash( instanceIndex );
const randY = hash( instanceIndex.add( 2 ) );
const randZ = hash( instanceIndex.add( 3 ) );
const position = positions.element( instanceIndex );
const color = colors.element( instanceIndex );

const x = instanceIndex.mod( amount );
const z = instanceIndex.div( amount );

position.x = offset.sub( x ).mul( separation );
position.z = offset.sub( z ).mul( separation );

position.x = randX.mul( 100 ).add( - 50 );
position.y = 0; // randY.mul( 10 );
position.z = randZ.mul( 100 ).add( - 50 );

color.assign( vec3( randX, randY, randZ ) );
color.x = hash( instanceIndex );
color.y = hash( instanceIndex.add( 2 ) );

} )().compute( particleCount );

//

const computeUpdate = Fn( () => {

const position = positionBuffer.element( instanceIndex );
const velocity = velocityBuffer.element( instanceIndex );
const position = positions.element( instanceIndex );
const velocity = velocities.element( instanceIndex );

velocity.addAssign( vec3( 0.00, gravity, 0.00 ) );
position.addAssign( velocity );
Expand All @@ -131,31 +132,26 @@

computeParticles = computeUpdate().compute( particleCount );

// create nodes

const textureNode = texture( map );

// create particles

const particleMaterial = new THREE.SpriteNodeMaterial();
particleMaterial.colorNode = textureNode.mul( colorBuffer.element( instanceIndex ) );
particleMaterial.positionNode = positionBuffer.toAttribute();
particleMaterial.scaleNode = size;
particleMaterial.depthWrite = false;
particleMaterial.depthTest = true;
particleMaterial.transparent = true;

const particles = new THREE.Mesh( new THREE.PlaneGeometry( 1, 1 ), particleMaterial );

const material = new THREE.SpriteNodeMaterial();
material.colorNode = uv().mul( colors.element( instanceIndex ) );
material.positionNode = positions.toAttribute();
material.scaleNode = size;
material.alphaTestNode = uv().mul( 2 ).distance( vec2( 1 ) );
material.transparent = false;

const particles = new THREE.Sprite( material );
particles.count = particleCount;
particles.frustumCulled = false;
scene.add( particles );

//

const helper = new THREE.GridHelper( 60, 40, 0x303030, 0x303030 );
const helper = new THREE.GridHelper( 90, 45, 0x303030, 0x303030 );
scene.add( helper );

const geometry = new THREE.PlaneGeometry( 1000, 1000 );
const geometry = new THREE.PlaneGeometry( 200, 200 );
geometry.rotateX( - Math.PI / 2 );

const plane = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { visible: false } ) );
Expand All @@ -179,19 +175,19 @@

renderer.computeAsync( computeInit );

// click event
// Hit

const computeHit = Fn( () => {

const position = positionBuffer.element( instanceIndex );
const velocity = velocityBuffer.element( instanceIndex );
const position = positions.element( instanceIndex );
const velocity = velocities.element( instanceIndex );

const dist = position.distance( clickPosition );
const direction = position.sub( clickPosition ).normalize();
const distArea = float( 6 ).sub( dist ).max( 0 );
const distArea = float( 3 ).sub( dist ).max( 0 );

const power = distArea.mul( .01 );
const relativePower = power.mul( hash( instanceIndex ).mul( .5 ).add( .5 ) );
const relativePower = power.mul( hash( instanceIndex ).mul( 1.5 ).add( .5 ) );

velocity.assign( velocity.add( direction.mul( relativePower ) ) );

Expand All @@ -200,12 +196,14 @@
//

function onMove( event ) {

if ( isOrbitControlsActive ) return;

pointer.set( ( event.clientX / window.innerWidth ) * 2 - 1, - ( event.clientY / window.innerHeight ) * 2 + 1 );

raycaster.setFromCamera( pointer, camera );

const intersects = raycaster.intersectObjects( [ plane ], false );
const intersects = raycaster.intersectObject( plane, false );

if ( intersects.length > 0 ) {

Expand All @@ -224,17 +222,24 @@

}

// events

renderer.domElement.addEventListener( 'pointermove', onMove );

//
// controls

controls = new OrbitControls( camera, renderer.domElement );
controls.enableDamping = true;
controls.minDistance = 5;
controls.maxDistance = 200;
controls.target.set( 0, 0, 0 );
controls.target.set( 0, -8, 0 );
controls.update();

controls.addEventListener( 'start', () => { isOrbitControlsActive = true; } );
controls.addEventListener( 'end', () => { isOrbitControlsActive = false; } );

controls.touches = {
ONE: null,
TWO: THREE.TOUCH.DOLLY_PAN
};

//

Expand Down Expand Up @@ -266,6 +271,8 @@

stats.update();

controls.update();

await renderer.computeAsync( computeParticles );
renderer.resolveTimestampsAsync( THREE.TimestampQuery.COMPUTE );

Expand Down
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