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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 - 2D texture array framebuffer attachment</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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+
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+ <script id="vertex-postprocess" type="x-shader/x-vertex">
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+
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+ out vec2 vUv;
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+
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+ void main()
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+ {
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+ vUv = uv;
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+ gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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+ }
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+
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+ </script>
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+
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+ <!--
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+ Fragment shader processing an input 2d texture array and writing the output
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+ into a framebuffer. The framebuffer should have a 2d texture array bound
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+ as color attachment.
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+ -->
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+ <script id="fragment-postprocess" type="x-shader/x-fragment">
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+
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+ precision highp sampler2DArray;
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+ precision mediump float;
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+
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+ in vec2 vUv;
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+
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+ uniform sampler2DArray uTexture;
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+ uniform int uDepth;
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+ uniform float uSampleLeft;
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+ uniform float uSampleWidth;
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+
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+ void main()
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+ {
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+ float voxel = texture( uTexture, vec3( vUv, uDepth ) ).r;
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+ gl_FragColor.r = (voxel - uSampleLeft) / uSampleWidth;
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+ }
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+
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+ </script>
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+
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+ <script id="vs" type="x-shader/x-vertex">
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+ uniform vec2 size;
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+ out vec2 vUv;
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+
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+ void main() {
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+
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+ gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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+
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+ // Convert position.xy to 1.0-0.0
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+
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+ vUv.xy = position.xy / size + 0.5;
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+ vUv.y = 1.0 - vUv.y; // original data is upside down
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+
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+ }
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+ </script>
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+
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+ <script id="fs" type="x-shader/x-fragment">
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+ precision highp float;
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+ precision highp int;
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+ precision highp sampler2DArray;
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+
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+ uniform sampler2DArray diffuse;
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+ in vec2 vUv;
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+ uniform int depth;
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+
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+ void main() {
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+
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+ vec4 color = texture( diffuse, vec3( vUv, depth ) );
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+
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+ // lighten a bit
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+ gl_FragColor = vec4( color.rrr * 1.5, 1.0 );
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+
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+ }
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+ </script>
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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">
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+ three.js
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+ </a>
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+ - 2D Texture array framebuffer color attachment
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+ <br />
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+
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+ <p>
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+ This example shows how to render to an array of 2D texture.</br>
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+ WebGL2 allows to render to specific "layers" in 3D texture and array of textures.</br>
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+ You can use the mouse left click to change the intensity of the render target.
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+ </p>
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+
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+ Scanned head data by
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+ <a href="https://www.codeproject.com/Articles/352270/Getting-started-with-Volume-Rendering" target="_blank" rel="noopener">Divine Augustine</a><br />
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+ licensed under
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+ <a href="https://www.codeproject.com/info/cpol10.aspx" target="_blank" rel="noopener">CPOL</a>
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+ </div>
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+
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+ <script type="module">
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+
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+ import * as THREE from '../build/three.module.js';
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+
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+ import Stats from './jsm/libs/stats.module.js';
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+ import { JSZip } from './jsm/libs/jszip.module.min.js';
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+
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+ import { WEBGL } from './jsm/WebGL.js';
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+
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+ if ( WEBGL.isWebGL2Available() === false ) {
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+
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+ document.body.appendChild( WEBGL.getWebGL2ErrorMessage() );
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+
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+ }
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+
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+ const DIMENSIONS = {
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+ width: 256,
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+ height: 256,
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+ depth: 109
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+ };
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+
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+ const App = {
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+ mousePrevious: new THREE.Vector2()
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+ };
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+
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+ /** Post-processing objects */
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+
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+ const postProcessScene = new THREE.Scene();
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+ const postProcessCamera = new THREE.OrthographicCamera( -1, 1, 1, -1, 0, 1 );
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+
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+ const renderTargetTexture = new THREE.DataTexture2DArray();
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+ renderTargetTexture.format = THREE.RedFormat;
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+ renderTargetTexture.type = THREE.UnsignedByteType;
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+
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+ const renderTarget = new THREE.WebGLRenderTarget();
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+ renderTarget.setTexture( renderTargetTexture );
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+ renderTarget.setSize( DIMENSIONS.width, DIMENSIONS.height, DIMENSIONS.depth );
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+
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+ const postProcessMaterial = new THREE.ShaderMaterial( {
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+ uniforms: {
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+ uTexture: { value: null },
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+ uDepth: { value: 55 },
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+ uSampleLeft: { value: 0 },
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+ uSampleWidth: { value: 1.0 },
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+ },
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+ vertexShader: document.getElementById( 'vertex-postprocess' ).textContent.trim(),
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+ fragmentShader: document.getElementById( 'fragment-postprocess' ).textContent.trim()
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+ } );
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+
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+ var depthStep = 0.4;
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+
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+ var camera, scene, mesh, renderer, stats;
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+
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+ var planeWidth = 50;
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+ var planeHeight = 50;
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+
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+ init();
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+
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+ function init() {
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+
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+ var container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 2000 );
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+ camera.position.z = 70;
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+
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+ scene = new THREE.Scene();
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+
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+ /** Post-processing scene */
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+
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+ const planeGeometry = new THREE.PlaneBufferGeometry( 2, 2 );
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+ const screenQuad = new THREE.Mesh( planeGeometry, postProcessMaterial );
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+ postProcessScene.add( screenQuad );
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+
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+ // 2D Texture array is available on WebGL 2.0
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+
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+ renderer = new THREE.WebGLRenderer();
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ container.appendChild( renderer.domElement );
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+
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+ renderer.domElement.addEventListener( 'mousedown', onMouseDown );
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+
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+ stats = new Stats();
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+ container.appendChild( stats.dom );
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ // width 256, height 256, depth 109, 8-bit, zip archived raw data
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+
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+ new THREE.FileLoader()
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+ .setResponseType( 'arraybuffer' )
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+ .load( 'textures/3d/head256x256x109.zip', function ( data ) {
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+
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+ var zip = new JSZip( data );
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+ var array = zip.files[ 'head256x256x109' ].asUint8Array();
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+
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+ const texture = new THREE.DataTexture2DArray( array, DIMENSIONS.width, DIMENSIONS.height, DIMENSIONS.depth );
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+ texture.format = THREE.RedFormat;
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+ texture.type = THREE.UnsignedByteType;
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+
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+ var material = new THREE.ShaderMaterial( {
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+ uniforms: {
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+ diffuse: { value: renderTarget.texture },
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+ depth: { value: 55 },
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+ size: { value: new THREE.Vector2( planeWidth, planeHeight ) }
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+ },
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+ vertexShader: document.getElementById( 'vs' ).textContent.trim(),
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+ fragmentShader: document.getElementById( 'fs' ).textContent.trim()
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+ } );
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+
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+ var geometry = new THREE.PlaneBufferGeometry( planeWidth, planeHeight );
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+
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+ mesh = new THREE.Mesh( geometry, material );
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+
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+ scene.add( mesh );
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+
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+ postProcessMaterial.uniforms.uTexture.value = texture;
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+
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+ animate();
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+
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+ } );
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+
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+ }
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+
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+ function onMouseDown(e) {
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+
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+ renderer.domElement.addEventListener('mouseup', onMouseUp);
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+ renderer.domElement.addEventListener('mousemove', onMouseMove);
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+
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+ App.mousePrevious.set(e.clientX, e.clientY);
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+
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+ }
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+
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+ function onMouseUp() {
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+
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+ renderer.domElement.removeEventListener('mousemove', onMouseMove);
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+ renderer.domElement.removeEventListener('mouseup', onMouseUp);
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+
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+ }
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+
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+ function onMouseMove(e) {
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+
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+ const x = e.clientX;
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+ const y = e.clientY;
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+ const deltaX = ( x - App.mousePrevious.x ) * 0.001;
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+ const deltaY = ( y - App.mousePrevious.y ) * 0.001;
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+ postProcessMaterial.uniforms.uSampleLeft.value += deltaX;
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+ postProcessMaterial.uniforms.uSampleWidth.value += deltaY;
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+
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+ App.mousePrevious.set(x, y);
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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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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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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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+ var value = mesh.material.uniforms[ "depth" ].value;
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+
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+ value += depthStep;
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+
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+ if ( value > 109.0 || value < 0.0 ) {
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+
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+ if ( value > 1.0 ) value = 109.0 * 2.0 - value;
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+ if ( value < 0.0 ) value = - value;
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+
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+ depthStep = - depthStep;
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+
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+ }
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+
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+ mesh.material.uniforms[ "depth" ].value = value;
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+
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+ render();
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+
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+ }
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+
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+ function renderTo2DArray() {
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+
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+ const layer = Math.floor( mesh.material.uniforms[ "depth" ].value );
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+ postProcessMaterial.uniforms.uDepth.value = layer;
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+ renderer.setRenderTarget( renderTarget, layer );
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+ renderer.render( postProcessScene, postProcessCamera );
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+ renderer.setRenderTarget( null );
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+
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+ }
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+
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+ function render() {
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+
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+ renderTo2DArray();
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+ renderer.render( scene, camera );
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+
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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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Mr.doob
