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148 lines
3.5 KiB
148 lines
3.5 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 - texture - partial update</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 noreferrer">three.js</a> - partial texture update <br/>
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replace parts of an existing texture with all data of another texture
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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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let camera, scene, renderer, clock, dataTexture, diffuseMap;
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let last = 0;
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const position = new THREE.Vector2();
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const color = new THREE.Color();
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init();
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function init() {
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camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
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camera.position.z = 2;
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scene = new THREE.Scene();
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clock = new THREE.Clock();
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const loader = new THREE.TextureLoader();
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diffuseMap = loader.load( 'textures/floors/FloorsCheckerboard_S_Diffuse.jpg', animate );
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diffuseMap.minFilter = THREE.LinearFilter;
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diffuseMap.generateMipmaps = false;
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const geometry = new THREE.PlaneGeometry( 2, 2 );
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const material = new THREE.MeshBasicMaterial( { map: diffuseMap } );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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//
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const width = 32;
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const height = 32;
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const data = new Uint8Array( width * height * 4 );
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dataTexture = new THREE.DataTexture( data, width, height );
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//
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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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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//
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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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const elapsedTime = clock.getElapsedTime();
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if ( elapsedTime - last > 0.1 ) {
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last = elapsedTime;
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position.x = ( 32 * THREE.MathUtils.randInt( 1, 16 ) ) - 32;
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position.y = ( 32 * THREE.MathUtils.randInt( 1, 16 ) ) - 32;
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// generate new color data
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updateDataTexture( dataTexture );
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// perform copy from src to dest texture to a random position
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renderer.copyTextureToTexture( position, dataTexture, diffuseMap );
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}
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renderer.render( scene, camera );
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}
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function updateDataTexture( texture ) {
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const size = texture.image.width * texture.image.height;
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const data = texture.image.data;
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// generate a random color and update texture data
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color.setHex( Math.random() * 0xffffff );
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const r = Math.floor( color.r * 255 );
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const g = Math.floor( color.g * 255 );
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const b = Math.floor( color.b * 255 );
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for ( let i = 0; i < size; i ++ ) {
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const stride = i * 4;
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data[ stride ] = r;
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data[ stride + 1 ] = g;
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data[ stride + 2 ] = b;
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data[ stride + 3 ] = 1;
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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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