javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
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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" rel="noopener">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.js"></script>
		<script src="js/math/Lut.js"></script>
		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>

		<script>

			if ( WEBGL.isWebGLAvailable() === false ) {

				document.body.appendChild( WEBGL.getWebGLErrorMessage() );

			}

			var container, stats;

			var camera, scene, renderer, lut, legendLayout;

			var mesh, material;

			var colorMap;
			var numberOfColors;

			var loader = new THREE.BufferGeometryLoader();

			init();
			animate();

			function init() {

				container = document.getElementById( 'container' );

				// SCENE
				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xffffff );

				// CAMERA
				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 100 );
				camera.position.set( 0, 0, 10 );

				stats = new Stats();
				container.appendChild( stats.dom );

				// LIGHT
				var ambientLight = new THREE.AmbientLight( 0x444444 );
				scene.add( ambientLight );

				colorMap = 'rainbow';
				numberOfColors = 512;

				legendLayout = 'vertical';

				material = new THREE.MeshLambertMaterial( {
					side: THREE.DoubleSide,
					color: 0xF5F5F5,
					vertexColors: THREE.VertexColors
				} );

				loadModel( colorMap, numberOfColors, legendLayout );

				var directionalLight = new THREE.DirectionalLight( 0xffffff, 0.7 );
				directionalLight.position.set( 17, 9, 30 );
				scene.add( directionalLight );

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize(  window.innerWidth,  window.innerHeight );
				container.appendChild( renderer.domElement );

				window.addEventListener( 'resize', onWindowResize, false );
				window.addEventListener( 'keydown', onKeyDown, true);

			}

			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() {

				if ( mesh !== undefined ) mesh.rotation.y += 0.01;

				renderer.render( scene, camera );

			}

			function loadModel ( colorMap, numberOfColors, legendLayout ) {

				loader.load( 'models/json/pressure.json', function( geometry ) {

					geometry.center();
					geometry.computeVertexNormals();

					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 ];

						var color = lut.getColor( colorValue );

						if ( color === undefined ) {

							console.log( 'Unable to determine color for value:', colorValue );

						} else {

							lutColors[ 3 * i ] = color.r;
							lutColors[ 3 * i + 1 ] = color.g;
							lutColors[ 3 * i + 2 ] = color.b;

						}

					}

					geometry.addAttribute( 'color', new THREE.Float32BufferAttribute( lutColors, 3 ) );
					geometry.removeAttribute( 'pressure' );

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

					scene.add( mesh );

					if ( legendLayout ) {

						var legend;

						if ( legendLayout === 'horizontal' ) {

							legend = lut.setLegendOn( { 'layout':'horizontal', 'position': { 'x': 4, 'y': 0, 'z': 0 } } );

						} 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 -- ) {

					var child = scene.children[ i ];

					if ( ! child.isLight ) {

						scene.remove( child );

						if ( child.isMesh || child.isLine ) {

							child.geometry.dispose();
							child.material.dispose();
							if ( child.material.map ) child.material.map.dispose();


						} else if ( child.isSprite ) {

							child.material.dispose();
							if ( child.material.map ) child.material.map.dispose();

						}

					}

				}

			}

			function onKeyDown( e ) {

				var maps = [ 'rainbow', 'cooltowarm', 'blackbody', 'grayscale' ];

				var colorNumbers = [ '16', '128', '256', '512' ];

				if ( e.keyCode === 65 ) {

					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 === 83 ) {

					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 === 68 ) {

					if ( ! legendLayout ) {

						cleanScene();

						legendLayout = 'vertical';

						loadModel( colorMap ,  numberOfColors, legendLayout );

					} else {

						cleanScene();

						legendLayout = lut.setLegendOff();

						loadModel( colorMap ,  numberOfColors, legendLayout );

					}

				} else if ( e.keyCode === 70 ) {

					cleanScene();

					if ( ! legendLayout ) return false;

					lut.setLegendOff();

					if ( legendLayout === 'horizontal') {

						legendLayout = 'vertical';

					} else {

						legendLayout = 'horizontal';

					}

					loadModel( colorMap ,  numberOfColors, legendLayout );

				}

			}

		</script>

	</body>
</html>