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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 webgpu - galaxy</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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+
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js webgpu</a> - galaxy
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+ <br>
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+ Based on <a href="https://threejs-journey.com/lessons/animated-galaxy" target="_blank" rel="noopener">Three.js Journey</a> lessons
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+ </div>
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+
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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/tsl": "../build/three.webgpu.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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+
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+ <script type="module">
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+
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+ import * as THREE from 'three';
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+ import { color, cos, float, mix, range, sin, timerLocal, uniform, uv, vec3, vec4, PI, PI2, tslFn } from 'three/tsl';
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+
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+ import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+
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+ let camera, scene, renderer, controls;
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+
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+ init();
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+
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+ function init() {
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+
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+ camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
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+ camera.position.set( 4, 2, 5 );
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+
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+ scene = new THREE.Scene();
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+ scene.background = new THREE.Color( 0x201919 );
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+
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+ // galaxy
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+
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+ const material = new THREE.SpriteNodeMaterial( {
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+ transparent: true,
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+ depthWrite: false,
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+ blending: THREE.AdditiveBlending
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+ } );
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+
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+ const size = uniform( 0.08 );
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+ material.scaleNode = range( 0, 1 ).mul( size );
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+
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+ const time = timerLocal();
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+
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+ const radiusRatio = range( 0, 1 );
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+ const radius = radiusRatio.pow( 1.5 ).mul( 5 ).toVar();
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+
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+ const branches = 3;
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+ const branchAngle = range( 0, branches ).floor().mul( PI2.div( branches ) );
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+ const angle = branchAngle.add( time.mul( radiusRatio.oneMinus() ) );
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+
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+ const position = vec3(
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+ cos( angle ),
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+ 0,
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+ sin( angle )
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+ ).mul( radius );
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+
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+ const sphericalToVec3 = tslFn( ( [ phi, theta ] ) => {
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+
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+ const sinPhiRadius = sin( phi );
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+
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+ return vec3(
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+ sinPhiRadius.mul( sin( theta ) ),
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+ cos( phi ),
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+ sinPhiRadius.mul( cos( theta ) )
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+ );
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+
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+ } );
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+
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+ const phi = range( 0, PI2 );
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+ const theta = range( 0, PI );
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+ const offsetRadius = range( 0, 1 ).pow( 2 ).mul( radiusRatio ).mul( 1.25 );
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+ const randomOffset = sphericalToVec3( phi, theta ).mul( offsetRadius );
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+
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+ material.positionNode = position.add( randomOffset );
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+
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+ const colorInside = uniform( color( '#ffa575' ) );
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+ const colorOutside = uniform( color( '#311599' ) );
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+ const colorFinal = mix( colorInside, colorOutside, radiusRatio.oneMinus().pow( 2 ).oneMinus() );
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+ const alpha = float( 0.1 ).div( uv().sub( 0.5 ).length() ).sub( 0.2 );
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+ material.colorNode = vec4( colorFinal, alpha );
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+
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+ const mesh = new THREE.InstancedMesh( new THREE.PlaneGeometry( 1, 1 ), material, 20000 );
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+ scene.add( mesh );
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+
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+ // debug
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+
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+ const gui = new GUI();
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+
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+ gui.add( size, 'value', 0, 1, 0.001 ).name( 'size' );
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+
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+ gui.addColor( { color: colorInside.value.getHex( THREE.SRGBColorSpace ) }, 'color' )
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+ .name( 'colorInside' )
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+ .onChange( function ( value ) {
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+
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+ colorInside.value.set( value );
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+
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+ } );
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+
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+ gui.addColor( { color: colorOutside.value.getHex( THREE.SRGBColorSpace ) }, 'color' )
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+ .name( 'colorOutside' )
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+ .onChange( function ( value ) {
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+
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+ colorOutside.value.set( value );
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+
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+ } );
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+
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+ // renderer
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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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+
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+ controls = new OrbitControls( camera, renderer.domElement );
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+ controls.enableDamping = true;
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+ controls.minDistance = 0.1;
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+ controls.maxDistance = 50;
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ async function animate() {
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+
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+ controls.update();
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+ </body>
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+</html>
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Bruno Simon
