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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - lookup table</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>
- body {
- background-color: #fff;
- color: #444;
- }
- a {
- color: red;
- }
- </style>
- </head>
- <body>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - lookup table<br/>
- vertex color values from a range of data values
- </div>
- <div id="container"></div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import { Lut } from 'three/addons/math/Lut.js';
- let container;
- let perpCamera, orthoCamera, renderer, lut;
- let mesh, sprite;
- let scene, uiScene;
- let params;
- init();
- function init() {
- container = document.getElementById( 'container' );
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0xffffff );
- uiScene = new THREE.Scene();
- lut = new Lut();
- const width = window.innerWidth;
- const height = window.innerHeight;
- perpCamera = new THREE.PerspectiveCamera( 60, width / height, 1, 100 );
- perpCamera.position.set( 0, 0, 10 );
- scene.add( perpCamera );
- orthoCamera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 1, 2 );
- orthoCamera.position.set( 0.5, 0, 1 );
- sprite = new THREE.Sprite( new THREE.SpriteMaterial( {
- map: new THREE.CanvasTexture( lut.createCanvas() )
- } ) );
- sprite.material.map.colorSpace = THREE.SRGBColorSpace;
- sprite.scale.x = 0.125;
- uiScene.add( sprite );
- mesh = new THREE.Mesh( undefined, new THREE.MeshLambertMaterial( {
- side: THREE.DoubleSide,
- color: 0xF5F5F5,
- vertexColors: true
- } ) );
- scene.add( mesh );
- params = {
- colorMap: 'rainbow',
- };
- loadModel( );
- const pointLight = new THREE.PointLight( 0xffffff, 3, 0, 0 );
- perpCamera.add( pointLight );
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.autoClear = false;
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( width, height );
- container.appendChild( renderer.domElement );
- window.addEventListener( 'resize', onWindowResize );
- const controls = new OrbitControls( perpCamera, renderer.domElement );
- controls.addEventListener( 'change', render );
- const gui = new GUI();
- gui.add( params, 'colorMap', [ 'rainbow', 'cooltowarm', 'blackbody', 'grayscale' ] ).onChange( function () {
- updateColors();
- render();
- } );
- }
- function onWindowResize() {
- const width = window.innerWidth;
- const height = window.innerHeight;
- perpCamera.aspect = width / height;
- perpCamera.updateProjectionMatrix();
- renderer.setSize( width, height );
- render();
- }
- function render() {
- renderer.clear();
- renderer.render( scene, perpCamera );
- renderer.render( uiScene, orthoCamera );
- }
- function loadModel( ) {
- const loader = new THREE.BufferGeometryLoader();
- loader.load( 'models/json/pressure.json', function ( geometry ) {
- geometry.center();
- geometry.computeVertexNormals();
- // default color attribute
- const colors = [];
- for ( let i = 0, n = geometry.attributes.position.count; i < n; ++ i ) {
- colors.push( 1, 1, 1 );
- }
- geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
- mesh.geometry = geometry;
- updateColors();
- render();
- } );
- }
- function updateColors() {
- lut.setColorMap( params.colorMap );
- lut.setMax( 2000 );
- lut.setMin( 0 );
- const geometry = mesh.geometry;
- const pressures = geometry.attributes.pressure;
- const colors = geometry.attributes.color;
- const color = new THREE.Color();
- for ( let i = 0; i < pressures.array.length; i ++ ) {
- const colorValue = pressures.array[ i ];
- color.copy( lut.getColor( colorValue ) ).convertSRGBToLinear();
- colors.setXYZ( i, color.r, color.g, color.b );
- }
- colors.needsUpdate = true;
- const map = sprite.material.map;
- lut.updateCanvas( map.image );
- map.needsUpdate = true;
- }
- </script>
- </body>
- </html>
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