You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
293 lines
7.4 KiB
293 lines
7.4 KiB
2 years ago
|
<!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>three.js webgl - 2D texture array framebuffer attachment</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">
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<script id="vertex-postprocess" type="x-shader/x-vertex">
|
||
|
|
|
||
|
|
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.
|
||
|
|
-->
|
||
|
|
<script id="fragment-postprocess" type="x-shader/x-fragment">
|
||
|
|
|
||
|
|
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>
|
||
|
|
|
||
|
|
<script id="vs" type="x-shader/x-vertex">
|
||
|
|
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>
|
||
|
|
|
||
|
|
<script id="fs" type="x-shader/x-fragment">
|
||
|
|
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>
|
||
|
|
<div id="info">
|
||
|
|
<a href="https://threejs.org" target="_blank" rel="noopener">
|
||
|
|
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
|
||
|
|
<a href="https://www.codeproject.com/info/cpol10.aspx" target="_blank" rel="noopener">CPOL</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<!-- Import maps polyfill -->
|
||
|
|
<!-- Remove this when import maps will be widely supported -->
|
||
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/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 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()
|
||
|
|
} );
|
||
|
|
|
||
|
|
var depthStep = 0.4;
|
||
|
|
|
||
|
|
var camera, scene, mesh, renderer, stats;
|
||
|
|
|
||
|
|
var planeWidth = 50;
|
||
|
|
var planeHeight = 50;
|
||
|
|
|
||
|
|
init();
|
||
|
|
|
||
|
|
function init() {
|
||
|
|
|
||
|
|
var 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 ) {
|
||
|
|
|
||
|
|
var 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;
|
||
|
|
|
||
|
|
var 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()
|
||
|
|
} );
|
||
|
|
|
||
|
|
var 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 );
|
||
|
|
|
||
|
|
var 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>
|