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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 - framebuffer - texture</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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+ <style>
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+ body {
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+ background:#777;
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+ padding:0;
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+ margin:0;
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+ overflow:hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px;
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+ width: 100%;
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+ color: #ffffff;
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+ padding: 5px;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+ }
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+
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+ a {
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+ color: #ffffff;
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+ }
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+
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+ #overlay {
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+ position: fixed;
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+ display: flex;
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+ flex-direction: column;
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+ justify-content: center;
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+ align-items: center;
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+ height: 100%;
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+ width: 100%;
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+ top: 0;
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+ z-index: 999;
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+ }
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+
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+ #overlay > div {
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+ height: 256px;
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+ width: 256px;
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+ border: 1px solid white;
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+ }
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+ </style>
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+
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+ <script src="../build/three.js"></script>
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+ <script src="js/controls/OrbitControls.js"></script>
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+ <script src="js/Detector.js"></script>
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+
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> framebuffer to texture <br/>
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+ The area of the white square is copied from the framebuffer to a texture (shown in the top-left corner).
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+ </div>
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+
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+ <div id="overlay">
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+ <div>
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+ </div>
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+ </div>
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+
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+ <script>
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+
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+ if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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+
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+ var camera, scene, renderer;
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+ var mesh, sprite, texture;
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+
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+ var cameraOrtho, sceneOrtho;
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+
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+ var dpr = window.devicePixelRatio;
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+
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+ var imageWidth = 256 * dpr;
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+ var imageHeight = 256 * dpr;
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ //
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+
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+ var width = window.innerWidth;
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+ var height = window.innerHeight;
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+
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+ camera = new THREE.PerspectiveCamera( 70, width / height, 1, 1000 );
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+ camera.position.z = 20;
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+
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+ cameraOrtho = new THREE.OrthographicCamera( - width / 2, width / 2, height / 2, - height / 2, 1, 10 );
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+ cameraOrtho.position.z = 10;
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+
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+ scene = new THREE.Scene();
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+ scene.background = new THREE.Color( 0x20252f );
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+ sceneOrtho = new THREE.Scene();
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+
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+ //
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+
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+ var geometry = new THREE.TorusKnotBufferGeometry( 3, 1, 256, 32 );
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+ var material = new THREE.MeshStandardMaterial( { color: 0x6083c2 } );
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+
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ //
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+ var ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
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+ scene.add( ambientLight );
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+
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+ var pointLight = new THREE.PointLight( 0xffffff, 0.8 );
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+ camera.add( pointLight );
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+ scene.add( camera );
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+
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+ //
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+
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+ texture = new THREE.Texture();
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+ texture.image = new Image( imageWidth, imageHeight );
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+ texture.format = THREE.RGBFormat;
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+ texture.minFilter = texture.magFilter = THREE.NearestFilter;
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+
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+ //
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+
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+ var spriteMaterial = new THREE.SpriteMaterial( { map: texture } );
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+ sprite = new THREE.Sprite( spriteMaterial );
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+ sprite.scale.set( imageWidth, imageHeight, 1 );
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+ sceneOrtho.add( sprite );
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+
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+ updateSpritePosition();
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+
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+ //
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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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+ renderer.autoClear = false;
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+ document.body.appendChild( renderer.domElement );
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+
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+ //
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+
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+ var overlay = document.getElementById( 'overlay' );
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+ var controls = new THREE.OrbitControls( camera, overlay );
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+
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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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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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+ var width = window.innerWidth;
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+ var height = window.innerHeight;
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+
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+ camera.aspect = width / height;
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+ camera.updateProjectionMatrix();
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+
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+ cameraOrtho.left = - width / 2;
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+ cameraOrtho.right = width / 2;
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+ cameraOrtho.top = height / 2;
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+ cameraOrtho.bottom = - height / 2;
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+ cameraOrtho.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ updateSpritePosition();
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+
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+ }
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+
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+ function updateSpritePosition() {
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+
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+ var halfWidth = window.innerWidth / 2;
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+ var halfHeight = window.innerHeight / 2;
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+
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+ var halfImageWidth = imageWidth / 2;
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+ var halfImageHeight = imageHeight / 2;
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+
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+ sprite.position.set( - halfWidth + halfImageWidth, halfHeight - halfImageHeight, 1 );
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+
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+ }
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ mesh.rotation.x += 0.005;
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+ mesh.rotation.y += 0.01;
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+
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+ renderer.clear();
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+ renderer.render( scene, camera );
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+
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+ // calculate start position for copying data
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+
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+ var x = ( window.innerWidth * dpr / 2 ) - ( imageWidth / 2 );
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+ var y = ( window.innerHeight * dpr / 2 ) - ( imageHeight / 2 );
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+
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+ renderer.copyFramebufferToTexture( x, y, texture );
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+
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+ renderer.clearDepth();
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+ renderer.render( sceneOrtho, cameraOrtho );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Mugen87