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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - framebuffer - texture</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">
- <style>
- #selection {
- position: fixed;
- display: flex;
- flex-direction: column;
- justify-content: center;
- align-items: center;
- height: 100%;
- width: 100%;
- top: 0;
- z-index: 999;
- }
- #selection > div {
- height: 128px;
- width: 128px;
- border: 1px solid white;
- }
- </style>
- </head>
- <body>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> framebuffer to texture
- </div>
- <div id="selection">
- <div></div>
- </div>
- <script type="module">
- import * as THREE from '../build/three.module.js';
- import { OrbitControls } from './jsm/controls/OrbitControls.js';
- var camera, scene, renderer;
- var mesh, sprite, texture;
- var cameraOrtho, sceneOrtho;
- var dpr = window.devicePixelRatio;
- var textureSize = 128 * dpr;
- var vector = new THREE.Vector2();
- init();
- animate();
- function init() {
- //
- var width = window.innerWidth;
- var height = window.innerHeight;
- camera = new THREE.PerspectiveCamera( 70, width / height, 1, 1000 );
- camera.position.z = 20;
- cameraOrtho = new THREE.OrthographicCamera( - width / 2, width / 2, height / 2, - height / 2, 1, 10 );
- cameraOrtho.position.z = 10;
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0x20252f );
- sceneOrtho = new THREE.Scene();
- //
- var geometry = new THREE.TorusKnotBufferGeometry( 3, 1, 256, 32 );
- var material = new THREE.MeshStandardMaterial( { color: 0x6083c2 } );
- mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- //
- var ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
- scene.add( ambientLight );
- var pointLight = new THREE.PointLight( 0xffffff, 0.8 );
- camera.add( pointLight );
- scene.add( camera );
- //
- var data = new Uint8Array( textureSize * textureSize * 3 );
- texture = new THREE.DataTexture( data, textureSize, textureSize, THREE.RGBFormat );
- texture.minFilter = THREE.NearestFilter;
- texture.magFilter = THREE.NearestFilter;
- //
- var spriteMaterial = new THREE.SpriteMaterial( { map: texture } );
- sprite = new THREE.Sprite( spriteMaterial );
- sprite.scale.set( textureSize, textureSize, 1 );
- sceneOrtho.add( sprite );
- updateSpritePosition();
- //
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.autoClear = false;
- document.body.appendChild( renderer.domElement );
- //
- var selection = document.getElementById( 'selection' );
- var controls = new OrbitControls( camera, selection );
- controls.enablePan = false;
- //
- window.addEventListener( 'resize', onWindowResize, false );
- }
- function onWindowResize() {
- var width = window.innerWidth;
- var height = window.innerHeight;
- camera.aspect = width / height;
- camera.updateProjectionMatrix();
- cameraOrtho.left = - width / 2;
- cameraOrtho.right = width / 2;
- cameraOrtho.top = height / 2;
- cameraOrtho.bottom = - height / 2;
- cameraOrtho.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- updateSpritePosition();
- }
- function updateSpritePosition() {
- var halfWidth = window.innerWidth / 2;
- var halfHeight = window.innerHeight / 2;
- var halfImageWidth = textureSize / 2;
- var halfImageHeight = textureSize / 2;
- sprite.position.set( - halfWidth + halfImageWidth, halfHeight - halfImageHeight, 1 );
- }
- function animate() {
- requestAnimationFrame( animate );
- mesh.rotation.x += 0.005;
- mesh.rotation.y += 0.01;
- renderer.clear();
- renderer.render( scene, camera );
- // calculate start position for copying data
- vector.x = ( window.innerWidth * dpr / 2 ) - ( textureSize / 2 );
- vector.y = ( window.innerHeight * dpr / 2 ) - ( textureSize / 2 );
- renderer.copyFramebufferToTexture( vector, texture );
- renderer.clearDepth();
- renderer.render( sceneOrtho, cameraOrtho );
- }
- </script>
- </body>
- </html>
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