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webgl_geometry_colors_lookuptable.html
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webgl_geometry_colors_lookuptable.html
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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">
<style>
body {
color: #000;
font-family:Monospace;
font-size:13px;
text-align:center;
font-weight: bold;
background-color: #fff;
margin: 0px;
overflow: hidden;
}
#info {
color:#000;
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
a {
color: red;
}
</style>
</head>
<body>
<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> webgl - lookuptable - vertex color values from a range of data values.</br>
press A: change color map, press S: change numberOfColors, press D: toggle Legend on/off, press F: change Legend layout</br>
</div>
<div id="container"></div>
<script src="../build/three.min.js"></script>
<script src="js/math/Lut.js"></script>
<script src="js/Detector.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
if ( ! Detector.webgl ) { Detector.addGetWebGLMessage(); }
var container, stats;
var camera, scene, renderer, lut, legendLayout;
var position;
var mesh;
var colorMap;
var numberOfColors;
init();
animate();
function init() {
container = document.getElementById( 'container' );
// SCENE
scene = new THREE.Scene();
// CAMERA
camera = new THREE.PerspectiveCamera( 20, window.innerWidth / window.innerHeight, 1, 10000 );
camera.name = 'camera';
scene.add( camera );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.bottom = '0px';
stats.domElement.style.zIndex = 100;
container.appendChild( stats.domElement );
// LIGHT
var ambientLight = new THREE.AmbientLight( 0x444444 );
ambientLight.name = 'ambientLight';
scene.add( ambientLight );
colorMap = 'rainbow';
numberOfColors = 512;
legendLayout = 'vertical';
loadModel( colorMap, numberOfColors, legendLayout );
camera.position.x = 17;
camera.position.y = 9;
camera.position.z = 32;
var directionalLight = new THREE.DirectionalLight( 0xffffff, 0.7 );
directionalLight.position.x = 17;
directionalLight.position.y = 9;
directionalLight.position.z = 30;
directionalLight.name = 'directionalLight';
scene.add( directionalLight );
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setClearColor( 0xffffff );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
window.addEventListener( 'resize', onWindowResize, false );
window.addEventListener( "keypress", onKeyPress, true);
}
var rotWorldMatrix;
function rotateAroundWorldAxis( object, axis, radians ) {
if ( ! axis ) return;
rotWorldMatrix = new THREE.Matrix4();
rotWorldMatrix.makeRotationAxis( axis.normalize(), radians );
rotWorldMatrix.multiply( object.matrix );
object.matrix = rotWorldMatrix;
object.rotation.setFromRotationMatrix( object.matrix );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
render();
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
rotateAroundWorldAxis(mesh, position, Math.PI / 180);
renderer.render( scene, camera );
}
function loadModel ( colorMap, numberOfColors, legendLayout ) {
var loader = new THREE.BufferGeometryLoader();
loader.load( "models/json/pressure.json", function( geometry ) {
geometry.computeVertexNormals();
geometry.normalizeNormals();
var material = new THREE.MeshLambertMaterial( {
side: THREE.DoubleSide,
specular: 0xF5F5F5,
color: 0xF5F5F5,
shininess: 5,
vertexColors: THREE.VertexColors
} );
var lutColors = [];
lut = new THREE.Lut( colorMap, numberOfColors );
lut.setMax( 2000 );
lut.setMin( 0 );
for ( var i = 0; i < geometry.attributes.pressure.array.length; i++ ) {
var colorValue = geometry.attributes.pressure.array[ i ];
color = lut.getColor( colorValue );
if ( color == undefined ) {
console.log( "ERROR: " + colorValue );
} else {
lutColors[ 3 * i ] = color.r;
lutColors[ 3 * i + 1 ] = color.g;
lutColors[ 3 * i + 2 ] = color.b;
}
}
geometry.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( lutColors ), 3 ) );
mesh = new THREE.Mesh ( geometry, material );
geometry.computeBoundingBox();
var boundingBox = geometry.boundingBox;
var center = boundingBox.center();
if ( position === undefined ) {
position = new THREE.Vector3(center.x, center.y, center.z);
}
scene.add ( mesh );
if ( legendLayout ) {
if ( legendLayout == 'horizontal' ) {
legend = lut.setLegendOn( { 'layout':'horizontal', 'position': { 'x': 21, 'y': 6, 'z': 5 } } );
}
else {
legend = lut.setLegendOn();
}
scene.add ( legend );
var labels = lut.setLegendLabels( { 'title': 'Pressure', 'um': 'Pa', 'ticks': 5 } );
scene.add ( labels['title'] );
for ( var i = 0; i < Object.keys( labels[ 'ticks' ] ).length; i++ ) {
scene.add ( labels[ 'ticks' ][ i ] );
scene.add ( labels[ 'lines' ][ i ] );
}
}
} );
}
function cleanScene () {
var elementsInTheScene = scene.children.length;
for ( var i = elementsInTheScene-1; i > 0; i-- ) {
if ( scene.children [ i ].name != 'camera' &&
scene.children [ i ].name != 'ambientLight' &&
scene.children [ i ].name != 'directionalLight') {
scene.remove ( scene.children [ i ] );
}
}
}
function onKeyPress ( e ) {
var maps = [ 'rainbow', 'cooltowarm', 'blackbody', 'grayscale' ];
var colorNumbers = ['16', '128', '256', '512' ];
if ( e.keyCode == 97 ) {
cleanScene();
var index = maps.indexOf( colorMap ) >= maps.length - 1 ? 0 : maps.indexOf( colorMap ) + 1;
colorMap = maps [ index ];
loadModel ( colorMap, numberOfColors, legendLayout );
} else if ( e.keyCode == 115 ) {
cleanScene();
var index = colorNumbers.indexOf( numberOfColors ) >= colorNumbers.length - 1 ? 0 : colorNumbers.indexOf( numberOfColors ) + 1;
numberOfColors = colorNumbers [ index ];
loadModel ( colorMap , numberOfColors, legendLayout );
} else if ( e.keyCode == 100 ) {
if ( ! legendLayout ) {
cleanScene();
legendLayout = 'vertical';
loadModel ( colorMap , numberOfColors, legendLayout );
} else {
cleanScene();
legendLayout = lut.setLegendOff();
loadModel ( colorMap , numberOfColors, legendLayout );
}
} else if ( e.keyCode == 102 ) {
cleanScene();
if ( ! legendLayout ) return false;
lut.setLegendOff();
if ( legendLayout == 'horizontal') {
legendLayout = 'vertical';
} else {
legendLayout = 'horizontal';
}
loadModel ( colorMap , numberOfColors, legendLayout );
}
}
</script>
</body>
</html>