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233 lines
5.5 KiB
233 lines
5.5 KiB
2 years ago
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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 webgl - simple global illumination</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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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - simple global illumination (<a href="http://www.iquilezles.org/www/articles/simplegi/simplegi.htm">article</a>)
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.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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<script type="module">
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import * as THREE from 'three';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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class GIMesh extends THREE.Mesh {
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copy( source ) {
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super.copy( source );
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this.geometry = source.geometry.clone();
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return this;
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}
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}
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//
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const SimpleGI = function ( renderer, scene ) {
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const SIZE = 32, SIZE2 = SIZE * SIZE;
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const camera = new THREE.PerspectiveCamera( 90, 1, 0.01, 100 );
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scene.updateMatrixWorld( true );
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let clone = scene.clone();
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clone.autoUpdate = false;
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const rt = new THREE.WebGLRenderTarget( SIZE, SIZE );
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const normalMatrix = new THREE.Matrix3();
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const position = new THREE.Vector3();
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const normal = new THREE.Vector3();
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let bounces = 0;
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let currentVertex = 0;
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const color = new Float32Array( 3 );
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const buffer = new Uint8Array( SIZE2 * 4 );
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function compute() {
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if ( bounces === 3 ) return;
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const object = scene.children[ 0 ]; // torusKnot
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const geometry = object.geometry;
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const attributes = geometry.attributes;
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const positions = attributes.position.array;
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const normals = attributes.normal.array;
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if ( attributes.color === undefined ) {
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const colors = new Float32Array( positions.length );
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geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ).setUsage( THREE.DynamicDrawUsage ) );
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}
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const colors = attributes.color.array;
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const startVertex = currentVertex;
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const totalVertex = positions.length / 3;
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for ( let i = 0; i < 32; i ++ ) {
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if ( currentVertex >= totalVertex ) break;
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position.fromArray( positions, currentVertex * 3 );
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position.applyMatrix4( object.matrixWorld );
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normal.fromArray( normals, currentVertex * 3 );
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normal.applyMatrix3( normalMatrix.getNormalMatrix( object.matrixWorld ) ).normalize();
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camera.position.copy( position );
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camera.lookAt( position.add( normal ) );
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renderer.setRenderTarget( rt );
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renderer.render( clone, camera );
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renderer.readRenderTargetPixels( rt, 0, 0, SIZE, SIZE, buffer );
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color[ 0 ] = 0;
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color[ 1 ] = 0;
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color[ 2 ] = 0;
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for ( let k = 0, kl = buffer.length; k < kl; k += 4 ) {
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color[ 0 ] += buffer[ k + 0 ];
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color[ 1 ] += buffer[ k + 1 ];
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color[ 2 ] += buffer[ k + 2 ];
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}
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colors[ currentVertex * 3 + 0 ] = color[ 0 ] / ( SIZE2 * 255 );
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colors[ currentVertex * 3 + 1 ] = color[ 1 ] / ( SIZE2 * 255 );
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colors[ currentVertex * 3 + 2 ] = color[ 2 ] / ( SIZE2 * 255 );
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currentVertex ++;
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}
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attributes.color.updateRange.offset = startVertex * 3;
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attributes.color.updateRange.count = ( currentVertex - startVertex ) * 3;
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attributes.color.needsUpdate = true;
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if ( currentVertex >= totalVertex ) {
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clone = scene.clone();
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clone.autoUpdate = false;
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bounces ++;
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currentVertex = 0;
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}
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requestAnimationFrame( compute );
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}
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requestAnimationFrame( compute );
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};
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//
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let camera, scene, renderer;
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 100 );
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camera.position.z = 4;
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scene = new THREE.Scene();
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// torus knot
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const torusGeometry = new THREE.TorusKnotGeometry( 0.75, 0.3, 128, 32, 1 );
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const material = new THREE.MeshBasicMaterial( { vertexColors: true } );
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const torusKnot = new GIMesh( torusGeometry, material );
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scene.add( torusKnot );
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// room
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const materials = [];
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for ( let i = 0; i < 8; i ++ ) {
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materials.push( new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff, side: THREE.BackSide } ) );
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}
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const boxGeometry = new THREE.BoxGeometry( 3, 3, 3 );
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const box = new THREE.Mesh( boxGeometry, materials );
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scene.add( box );
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//
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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new SimpleGI( renderer, scene );
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const controls = new OrbitControls( camera, renderer.domElement );
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controls.minDistance = 1;
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controls.maxDistance = 10;
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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requestAnimationFrame( animate );
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renderer.setRenderTarget( null );
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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