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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 - earth</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> - earth
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+ <br>
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+ Based on <a href="https://threejs-journey.com/lessons/earth-shaders" target="_blank" rel="noopener">Three.js Journey</a> lesson
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+ <br>
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+ Earth textures from <a href="https://www.solarsystemscope.com/textures/" target="_blank" rel="noopener">Solar System Scope</a> (resized and merged)
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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 { step, normalWorld, output, texture, vec3, vec4, normalize, positionWorld, cameraPosition, color, uniform, mix, uv, max } from 'three/tsl';
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+
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+ import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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+
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+ let camera, scene, renderer, controls, globe, clock;
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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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+ clock = new THREE.Clock();
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+
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+ camera = new THREE.PerspectiveCamera( 25, window.innerWidth / window.innerHeight, 0.1, 100 );
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+ camera.position.set( 4.5, 2, 3 );
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+
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+ scene = new THREE.Scene();
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+
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+ // sun
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+
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+ const sun = new THREE.DirectionalLight( '#ffffff', 2 );
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+ sun.position.set( 0, 0, 3 );
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+ scene.add( sun );
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+
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+ // uniforms
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+
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+ const atmosphereDayColor = uniform( color( '#4db2ff' ) );
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+ const atmosphereTwilightColor = uniform( color( '#bc490b' ) );
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+ const roughnessLow = uniform( 0.25 );
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+ const roughnessHigh = uniform( 0.35 );
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+
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+ // textures
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+
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+ const textureLoader = new THREE.TextureLoader();
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+
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+ const dayTexture = textureLoader.load( './textures/planets/earth_day_4096.jpg' );
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+ dayTexture.colorSpace = THREE.SRGBColorSpace;
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+ dayTexture.anisotropy = 8;
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+
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+ const nightTexture = textureLoader.load( './textures/planets/earth_night_4096.jpg' );
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+ nightTexture.colorSpace = THREE.SRGBColorSpace;
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+ nightTexture.anisotropy = 8;
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+
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+ const bumpRoughnessCloudsTexture = textureLoader.load( './textures/planets/earth_bump_roughness_clouds_4096.jpg' );
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+ bumpRoughnessCloudsTexture.anisotropy = 8;
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+
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+ // fresnel
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+
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+ const viewDirection = positionWorld.sub( cameraPosition ).normalize();
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+ const fresnel = viewDirection.dot( normalWorld ).abs().oneMinus().toVar();
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+
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+ // sun orientation
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+
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+ const sunOrientation = normalWorld.dot( normalize( sun.position ) ).toVar();
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+
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+ // atmosphere color
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+
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+ const atmosphereColor = mix( atmosphereTwilightColor, atmosphereDayColor, sunOrientation.smoothstep( - 0.25, 0.75 ) );
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+
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+ // globe
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+
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+ const globeMaterial = new THREE.MeshStandardNodeMaterial();
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+
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+ const cloudsStrength = texture( bumpRoughnessCloudsTexture, uv() ).b.smoothstep( 0.2, 1 );
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+
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+ globeMaterial.colorNode = mix( texture( dayTexture ), vec3( 1 ), cloudsStrength.mul( 2 ) );
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+
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+ const roughness = max(
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+ texture( bumpRoughnessCloudsTexture ).g,
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+ step( 0.01, cloudsStrength )
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+ );
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+ globeMaterial.roughnessNode = roughness.remap( 0, 1, roughnessLow, roughnessHigh );
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+
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+ const night = texture( nightTexture );
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+ const dayStrength = sunOrientation.smoothstep( - 0.25, 0.5 );
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+
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+ const atmosphereDayStrength = sunOrientation.smoothstep( - 0.5, 1 );
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+ const atmosphereMix = atmosphereDayStrength.mul( fresnel.pow( 2 ) ).clamp( 0, 1 );
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+
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+ let finalOutput = mix( night.rgb, output.rgb, dayStrength );
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+ finalOutput = mix( finalOutput, atmosphereColor, atmosphereMix );
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+
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+ globeMaterial.outputNode = vec4( finalOutput, output.a );
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+
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+ const bumpElevation = max(
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+ texture( bumpRoughnessCloudsTexture ).r,
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+ cloudsStrength
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+ );
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+ globeMaterial.normalNode = bumpElevation.bumpMap();
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+
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+ const sphereGeometry = new THREE.SphereGeometry( 1, 64, 64 );
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+ globe = new THREE.Mesh( sphereGeometry, globeMaterial );
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+ scene.add( globe );
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+
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+ // atmosphere
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+
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+ const atmosphereMaterial = new THREE.MeshBasicNodeMaterial( { side: THREE.BackSide, transparent: true } );
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+ let alpha = fresnel.remap( 0.73, 1, 1, 0 ).pow( 3 );
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+ alpha = alpha.mul( sunOrientation.smoothstep( - 0.5, 1 ) );
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+ atmosphereMaterial.outputNode = vec4( atmosphereColor, alpha );
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+
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+ const atmosphere = new THREE.Mesh( sphereGeometry, atmosphereMaterial );
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+ atmosphere.scale.setScalar( 1.04 );
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+ scene.add( atmosphere );
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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
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+ .addColor( { color: atmosphereDayColor.value.getHex( THREE.SRGBColorSpace ) }, 'color' )
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+ .onChange( ( value ) => {
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+
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+ atmosphereDayColor.value.set( value );
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+
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+ } )
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+ .name( 'atmosphereDayColor' );
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+
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+ gui
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+ .addColor( { color: atmosphereTwilightColor.value.getHex( THREE.SRGBColorSpace ) }, 'color' )
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+ .onChange( ( value ) => {
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+
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+ atmosphereTwilightColor.value.set( value );
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+
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+ } )
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+ .name( 'atmosphereTwilightColor' );
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+
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+ gui.add( roughnessLow, 'value', 0, 1, 0.001 ).name( 'roughnessLow' );
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+ gui.add( roughnessHigh, 'value', 0, 1, 0.001 ).name( 'roughnessHigh' );
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+
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+ // renderer
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+
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+ renderer = new THREE.WebGPURenderer();
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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
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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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+ const delta = clock.getDelta();
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+ globe.rotation.y += delta * 0.025;
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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
