three.js/examples/webgl2_rendertarget_texture2darray.html at dev · XRSharp/three.js · GitHub

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<!DOCTYPE html>

<head>

<title>three.js webgl - 2D texture array framebuffer attachment</title>

</head>

out vec2 vUv;

void main()

{

vUv = uv;

gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

}

</script>

<!--

Fragment shader processing an input 2d texture array and writing the output

into a framebuffer. The framebuffer should have a 2d texture array bound

as color attachment.

-->

precision highp sampler2DArray;

precision mediump float;

in vec2 vUv;

uniform sampler2DArray uTexture;

uniform int uDepth;

uniform float uIntensity;

void main()

{

float voxel = texture(uTexture, vec3( vUv, uDepth )).r;

gl_FragColor.r = voxel * uIntensity;

}

</script>

uniform vec2 size;

out vec2 vUv;

void main() {

gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

// Convert position.xy to 1.0-0.0

vUv.xy = position.xy / size + 0.5;

vUv.y = 1.0 - vUv.y; // original data is upside down

}

</script>

precision highp float;

precision highp int;

precision highp sampler2DArray;

uniform sampler2DArray diffuse;

in vec2 vUv;

uniform int depth;

void main() {

vec4 color = texture( diffuse, vec3( vUv, depth ) );

// lighten a bit

gl_FragColor = vec4( color.rrr * 1.5, 1.0 );

}

</script>

<body>

three.js

</a>

- 2D Texture array framebuffer color attachment

<br />

<p>

This example shows how to render to an array of 2D texture.</br>

WebGL2 allows to render to specific "layers" in 3D texture and array of textures.

</p>

Scanned head data by

<a href="https://www.codeproject.com/Articles/352270/Getting-started-with-Volume-Rendering" target="_blank" rel="noopener">Divine Augustine</a><br />

licensed under

</div>

{

"imports": {

"three": "../build/three.module.js",

"three/addons/": "./jsm/"

}

</script>

import * as THREE from 'three';

import Stats from 'three/addons/libs/stats.module.js';

import { unzipSync } from 'three/addons/libs/fflate.module.js';

import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

import WebGL from 'three/addons/capabilities/WebGL.js';

if ( WebGL.isWebGL2Available() === false ) {

document.body.appendChild( WebGL.getWebGL2ErrorMessage() );

}

const DIMENSIONS = {

width: 256,

height: 256,

depth: 109

};

const params = {

intensity: 1

};

/** Post-processing objects */

const postProcessScene = new THREE.Scene();

const postProcessCamera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );

const renderTarget = new THREE.WebGLArrayRenderTarget( DIMENSIONS.width, DIMENSIONS.height, DIMENSIONS.depth );

renderTarget.texture.format = THREE.RedFormat;

const postProcessMaterial = new THREE.ShaderMaterial( {

uniforms: {

uTexture: { value: null },

uDepth: { value: 55 },

uIntensity: { value: 1.0 }

vertexShader: document.getElementById( 'vertex-postprocess' ).textContent.trim(),

fragmentShader: document.getElementById( 'fragment-postprocess' ).textContent.trim()

} );

let depthStep = 0.4;

let camera, scene, mesh, renderer, stats;

const planeWidth = 50;

const planeHeight = 50;

init();

function init() {

const container = document.createElement( 'div' );

document.body.appendChild( container );

camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 2000 );

camera.position.z = 70;

scene = new THREE.Scene();

/** Post-processing scene */

const planeGeometry = new THREE.PlaneGeometry( 2, 2 );

const screenQuad = new THREE.Mesh( planeGeometry, postProcessMaterial );

postProcessScene.add( screenQuad );

// 2D Texture array is available on WebGL 2.0

renderer = new THREE.WebGLRenderer();

renderer.setPixelRatio( window.devicePixelRatio );

renderer.setSize( window.innerWidth, window.innerHeight );

container.appendChild( renderer.domElement );

stats = new Stats();

container.appendChild( stats.dom );

window.addEventListener( 'resize', onWindowResize );

const gui = new GUI();

gui.add( params, 'intensity', 0, 1 ).step( 0.01 ).onChange( value => postProcessMaterial.uniforms.uIntensity.value = value );

gui.open();

// width 256, height 256, depth 109, 8-bit, zip archived raw data

new THREE.FileLoader()

.setResponseType( 'arraybuffer' )

.load( 'textures/3d/head256x256x109.zip', function ( data ) {

const zip = unzipSync( new Uint8Array( data ) );

const array = new Uint8Array( zip[ 'head256x256x109' ].buffer );

const texture = new THREE.DataArrayTexture( array, DIMENSIONS.width, DIMENSIONS.height, DIMENSIONS.depth );

texture.format = THREE.RedFormat;

texture.needsUpdate = true;

const material = new THREE.ShaderMaterial( {

uniforms: {

diffuse: { value: renderTarget.texture },

depth: { value: 55 },

size: { value: new THREE.Vector2( planeWidth, planeHeight ) }

vertexShader: document.getElementById( 'vs' ).textContent.trim(),

fragmentShader: document.getElementById( 'fs' ).textContent.trim()

} );

const geometry = new THREE.PlaneGeometry( planeWidth, planeHeight );

mesh = new THREE.Mesh( geometry, material );

scene.add( mesh );

postProcessMaterial.uniforms.uTexture.value = texture;

animate();

} );

}

function onWindowResize() {

camera.aspect = window.innerWidth / window.innerHeight;

camera.updateProjectionMatrix();

renderer.setSize( window.innerWidth, window.innerHeight );

}

function animate() {

requestAnimationFrame( animate );

let value = mesh.material.uniforms[ 'depth' ].value;

value += depthStep;

if ( value > 109.0 || value < 0.0 ) {

if ( value > 1.0 ) value = 109.0 * 2.0 - value;

if ( value < 0.0 ) value = - value;

depthStep = - depthStep;

}

mesh.material.uniforms[ 'depth' ].value = value;

render();

}

/**

* Renders the 2D array into the render target `renderTarget`.

function renderTo2DArray() {

const layer = Math.floor( mesh.material.uniforms[ 'depth' ].value );

postProcessMaterial.uniforms.uDepth.value = layer;

renderer.setRenderTarget( renderTarget, layer );

renderer.render( postProcessScene, postProcessCamera );

renderer.setRenderTarget( null );

}

function render() {

// Step 1 - Render the input DataArrayTexture into render target

renderTo2DArray();

// Step 2 - Renders the scene containing the plane with a material

// sampling the render target texture.

renderer.render( scene, camera );

}

</script>

</body>

</html>

three.js/examples/webgl2_rendertarget_texture2darray.html at dev · XRSharp/three.js · GitHub

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