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webgl_framebuffer_texture.html
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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>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
<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();
animate();
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, THREE.RGBAFormat );
texture.minFilter = THREE.NearestFilter;
texture.magFilter = THREE.NearestFilter;
//
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.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() {
requestAnimationFrame( 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( vector, texture );
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>