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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 - angular slicing</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> - angular slicing
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+ <br>
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+ Based on <a href="https://threejs-journey.com/lessons/sliced-model-shader" target="_blank" rel="noopener">Three.js Journey</a> lesson
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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 { If, PI2, atan2, color, frontFacing, output, positionLocal, tslFn, uniform, vec4 } from 'three/tsl';
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+
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+ import { DRACOLoader } from 'three/addons/loaders/DRACOLoader.js';
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+ import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
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+ import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';
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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;
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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( 35, window.innerWidth / window.innerHeight, 0.1, 100 );
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+ camera.position.set( - 5, 5, 12 );
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+
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+ scene = new THREE.Scene();
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+
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+ const gui = new GUI();
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+
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+ // environment
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+
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+ const rgbeLoader = new RGBELoader();
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+ rgbeLoader.load( './textures/equirectangular/royal_esplanade_1k.hdr', ( environmentMap ) => {
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+
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+ environmentMap.mapping = THREE.EquirectangularReflectionMapping;
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+
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+ scene.background = environmentMap;
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+ scene.environment = environmentMap;
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+
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+ } );
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+
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+ // lights
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+
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+ const directionalLight = new THREE.DirectionalLight( '#ffffff', 4 );
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+ directionalLight.position.set( 6.25, 3, 4 );
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+ directionalLight.castShadow = true;
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+ directionalLight.shadow.mapSize.set( 1024, 1024 );
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+ directionalLight.shadow.camera.near = 0.1;
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+ directionalLight.shadow.camera.far = 30;
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+ directionalLight.shadow.camera.top = 8;
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+ directionalLight.shadow.camera.right = 8;
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+ directionalLight.shadow.camera.bottom = - 8;
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+ directionalLight.shadow.camera.left = - 8;
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+ directionalLight.shadow.normalBias = 0.05;
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+ scene.add( directionalLight );
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+
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+ // TSL functions
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+
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+ const inAngle = tslFn( ( [ position, angleStart, angleArc ] ) => {
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+
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+ const angle = atan2( position.y, position.x ).sub( angleStart ).mod( PI2 ).toVar();
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+ return angle.greaterThan( 0 ).and( angle.lessThan( angleArc ) );
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+
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+ } );
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+
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+ // materials
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+
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+ const defaultMaterial = new THREE.MeshPhysicalNodeMaterial( {
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+ metalness: 0.5,
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+ roughness: 0.25,
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+ envMapIntensity: 0.5,
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+ color: '#858080'
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+ } );
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+
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+ const slicedMaterial = new THREE.MeshPhysicalNodeMaterial( {
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+ metalness: 0.5,
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+ roughness: 0.25,
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+ envMapIntensity: 0.5,
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+ color: '#858080',
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+ side: THREE.DoubleSide
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+ } );
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+
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+ // uniforms
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+
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+ const sliceStart = uniform( 1.75 );
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+ const sliceArc = uniform( 1.25 );
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+ const sliceColor = uniform( color( '#b62f58' ) );
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+
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+ // debug
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+
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+ gui.add( sliceStart, 'value', - Math.PI, Math.PI, 0.001 ).name( 'sliceStart' );
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+ gui.add( sliceArc, 'value', 0, Math.PI * 2, 0.001 ).name( 'sliceArc' );
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+ gui.addColor( { color: sliceColor.value.getHexString( THREE.SRGBColorSpace ) }, 'color' ).onChange( value => sliceColor.value.set( value ) );
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+
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+ // output
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+
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+ slicedMaterial.outputNode = tslFn( () => {
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+
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+ // discard
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+
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+ inAngle( positionLocal.xy, sliceStart, sliceArc ).discard();
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+
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+ // backface color
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+
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+ const finalOutput = output;
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+ If( frontFacing.not(), () => {
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+
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+ finalOutput.assign( vec4( sliceColor, 1 ) );
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+
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+ } );
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+
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+ return finalOutput;
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+
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+ } )();
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+
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+ // shadow
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+
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+ slicedMaterial.shadowNode = tslFn( () => {
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+
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+ // discard
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+
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+ inAngle( positionLocal.xy, sliceStart, sliceArc ).discard();
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+
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+ return vec4( 0, 0, 0, 1 );
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+
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+ } )();
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+
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+ // model
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+
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+ const dracoLoader = new DRACOLoader();
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+ dracoLoader.setDecoderPath( 'jsm/libs/draco/' );
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+
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+ const gltfLoader = new GLTFLoader();
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+ gltfLoader.setDRACOLoader( dracoLoader );
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+
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+ gltfLoader.load( './models/gltf/gears.glb', ( gltf ) => {
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+
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+ const model = gltf.scene;
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+
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+ model.traverse( ( child ) => {
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+
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+ if ( child.isMesh ) {
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+
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+ if ( child.name === 'outerHull' )
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+ child.material = slicedMaterial;
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+ else
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+ child.material = defaultMaterial;
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+
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+ child.castShadow = true;
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+ child.receiveShadow = true;
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+
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+ }
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+
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+ } );
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+
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+ scene.add( model );
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+
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+ } );
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+
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+ // plane
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+
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+ const plane = new THREE.Mesh(
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+ new THREE.PlaneGeometry( 10, 10, 10 ),
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+ new THREE.MeshStandardMaterial( { color: '#aaaaaa' } )
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+ );
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+ plane.receiveShadow = true;
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+ plane.position.set( - 4, - 3, - 4 );
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+ plane.lookAt( new THREE.Vector3( 0, 0, 0 ) );
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+ scene.add( plane );
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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.toneMapping = THREE.ACESFilmicToneMapping;
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+ renderer.toneMappingExposure = 1;
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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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+ 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
