Examples: Add galaxy (#28955)

* Examples: Add galaxy * update screenshot * Examples: Rename TSL Galaxy and use THREE core materials * Examples: TSL Galaxy fix screenshot * update screenshot * Examples: TSL Galaxy fix pow on negative ---------
mrdoob · Jul 24, 2024 · e241101 · e241101
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diff --git a/examples/files.json b/examples/files.json
@@ -401,6 +401,7 @@
 		"webgpu_textures_anisotropy",
 		"webgpu_textures_partialupdate",
 		"webgpu_tsl_editor",
+		"webgpu_tsl_galaxy",
 		"webgpu_tsl_transpiler",
 		"webgpu_video_panorama",
 		"webgpu_volume_cloud",

diff --git a/examples/screenshots/webgpu_tsl_galaxy.jpg b/examples/screenshots/webgpu_tsl_galaxy.jpg
diff --git a/examples/webgpu_tsl_galaxy.html b/examples/webgpu_tsl_galaxy.html
@@ -0,0 +1,159 @@
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<title>three.js webgpu - galaxy</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="info">
+			<a href="https://threejs.org" target="_blank" rel="noopener">three.js webgpu</a> - galaxy
+			<br>
+			Based on <a href="https://threejs-journey.com/lessons/animated-galaxy" target="_blank" rel="noopener">Three.js Journey</a> lessons
+		</div>
+
+		<script type="importmap">
+			{
+				"imports": {
+					"three": "../build/three.webgpu.js",
+					"three/tsl": "../build/three.webgpu.js",
+					"three/addons/": "./jsm/"
+				}
+			}
+		</script>
+
+		<script type="module">
+
+			import * as THREE from 'three';
+			import { color, cos, float, mix, range, sin, timerLocal, uniform, uv, vec3, vec4, PI, PI2, tslFn } from 'three/tsl';
+
+			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
+			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
+
+			let camera, scene, renderer, controls;
+
+			init();
+
+			function init() {
+
+				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
+				camera.position.set( 4, 2, 5 );
+
+				scene = new THREE.Scene();
+				scene.background = new THREE.Color( 0x201919 );
+
+				// galaxy
+
+				const material = new THREE.SpriteNodeMaterial( {
+					transparent: true,
+					depthWrite: false,
+					blending: THREE.AdditiveBlending
+				} );
+
+				const size = uniform( 0.08 );
+				material.scaleNode = range( 0, 1 ).mul( size );
+
+				const time = timerLocal();
+
+				const radiusRatio = range( 0, 1 );
+				const radius = radiusRatio.pow( 1.5 ).mul( 5 ).toVar();
+
+				const branches = 3;
+				const branchAngle = range( 0, branches ).floor().mul( PI2.div( branches ) );
+				const angle = branchAngle.add( time.mul( radiusRatio.oneMinus() ) );
+
+				const position = vec3(
+					cos( angle ),
+					0,
+					sin( angle )
+				).mul( radius );
+
+				const sphericalToVec3 = tslFn( ( [ phi, theta ] ) => {
+
+					const sinPhiRadius = sin( phi );
+
+					return vec3(
+						sinPhiRadius.mul( sin( theta ) ),
+						cos( phi ),
+						sinPhiRadius.mul( cos( theta ) )
+					);
+
+				} );
+
+				const phi = range( 0, PI2 );
+				const theta = range( 0, PI );
+				const offsetRadius = range( 0, 1 ).pow( 2 ).mul( radiusRatio ).mul( 1.25 );
+				const randomOffset = sphericalToVec3( phi, theta ).mul( offsetRadius );
+
+				material.positionNode = position.add( randomOffset );
+
+				const colorInside = uniform( color( '#ffa575' ) );
+				const colorOutside = uniform( color( '#311599' ) );
+				const colorFinal = mix( colorInside, colorOutside, radiusRatio.oneMinus().pow( 2 ).oneMinus() );
+				const alpha = float( 0.1 ).div( uv().sub( 0.5 ).length() ).sub( 0.2 );
+				material.colorNode = vec4( colorFinal, alpha );
+
+				const mesh = new THREE.InstancedMesh( new THREE.PlaneGeometry( 1, 1 ), material, 20000 );
+				scene.add( mesh );
+
+				// debug
+
+				const gui = new GUI();
+
+				gui.add( size, 'value', 0, 1, 0.001 ).name( 'size' );
+
+				gui.addColor( { color: colorInside.value.getHex( THREE.SRGBColorSpace ) }, 'color' )
+					.name( 'colorInside' )
+					.onChange( function ( value ) {
+
+						colorInside.value.set( value );
+
+					} );
+
+				gui.addColor( { color: colorOutside.value.getHex( THREE.SRGBColorSpace ) }, 'color' )
+					.name( 'colorOutside' )
+					.onChange( function ( value ) {
+
+						colorOutside.value.set( value );
+
+					} );
+
+				// renderer
+
+				renderer = new THREE.WebGPURenderer( { antialias: true } );
+				renderer.setPixelRatio( window.devicePixelRatio );
+				renderer.setSize( window.innerWidth, window.innerHeight );
+				renderer.setAnimationLoop( animate );
+				document.body.appendChild( renderer.domElement );
+
+				controls = new OrbitControls( camera, renderer.domElement );
+				controls.enableDamping = true;
+				controls.minDistance = 0.1;
+				controls.maxDistance = 50;
+
+				window.addEventListener( 'resize', onWindowResize );
+
+			}
+
+			function onWindowResize() {
+
+				camera.aspect = window.innerWidth / window.innerHeight;
+				camera.updateProjectionMatrix();
+
+				renderer.setSize( window.innerWidth, window.innerHeight );
+
+			}
+
+			async function animate() {
+
+				controls.update();
+
+				renderer.render( scene, camera );
+
+			}
+
+		</script>
+	</body>
+</html>