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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="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import * as GeometryUtils from 'three/addons/utils/GeometryUtils.js';
- let camera, scene, renderer;
- let line, sprite, texture;
- let cameraOrtho, sceneOrtho;
- let offset = 0;
- const dpr = window.devicePixelRatio;
- const textureSize = 128 * dpr;
- const vector = new THREE.Vector2();
- const color = new THREE.Color();
- init();
- function init() {
- //
- const width = window.innerWidth;
- const 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();
- sceneOrtho = new THREE.Scene();
- //
- const points = GeometryUtils.gosper( 8 );
- const geometry = new THREE.BufferGeometry();
- const positionAttribute = new THREE.Float32BufferAttribute( points, 3 );
- geometry.setAttribute( 'position', positionAttribute );
- geometry.center();
- const colorAttribute = new THREE.BufferAttribute( new Float32Array( positionAttribute.array.length ), 3 );
- colorAttribute.setUsage( THREE.DynamicDrawUsage );
- geometry.setAttribute( 'color', colorAttribute );
- const material = new THREE.LineBasicMaterial( { vertexColors: true } );
- line = new THREE.Line( geometry, material );
- line.scale.setScalar( 0.05 );
- scene.add( line );
- //
- texture = new THREE.FramebufferTexture( textureSize, textureSize );
- //
- const 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.setAnimationLoop( animate );
- renderer.autoClear = false;
- document.body.appendChild( renderer.domElement );
- //
- const selection = document.getElementById( 'selection' );
- const controls = new OrbitControls( camera, selection );
- controls.enablePan = false;
- //
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- const width = window.innerWidth;
- const 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() {
- const halfWidth = window.innerWidth / 2;
- const halfHeight = window.innerHeight / 2;
- const halfImageWidth = textureSize / 2;
- const halfImageHeight = textureSize / 2;
- sprite.position.set( - halfWidth + halfImageWidth, halfHeight - halfImageHeight, 1 );
- }
- function animate() {
- const colorAttribute = line.geometry.getAttribute( 'color' );
- updateColors( colorAttribute );
- // scene rendering
- 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( texture, vector );
- renderer.clearDepth();
- renderer.render( sceneOrtho, cameraOrtho );
- }
- function updateColors( colorAttribute ) {
- const l = colorAttribute.count;
- for ( let i = 0; i < l; i ++ ) {
- const h = ( ( offset + i ) % l ) / l;
- color.setHSL( h, 1, 0.5 );
- colorAttribute.setX( i, color.r );
- colorAttribute.setY( i, color.g );
- colorAttribute.setZ( i, color.b );
- }
- colorAttribute.needsUpdate = true;
- offset -= 25;
- }
- </script>
- </body>
- </html>
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