javascript
/
three.js
zrkadlo https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
	<title>three.js webgl - volume rendering example</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 {
			font-family: Monospace;
			background-color: #000;
			color: #fff;
			margin: 0px;
			overflow: hidden;
		}
		#info {
			color: #fff;
			position: absolute;
			top: 10px;
			width: 100%;
			text-align: center;
			z-index: 5;
			display:block;
		}
		.dg {
			z-index: 10 !important;
		}
		#info a, .button { color: #f00; font-weight: bold; text-decoration: underline; cursor: pointer }
		#inset  {
			width: 150px;
			height: 150px;
			background-color: transparent; /* or transparent; will show through only if renderer alpha: true */
			border: none; /* or none; */
			margin: 0;
			padding: 0px;
			position: absolute;
			left: 20px;
			bottom: 20px;
			z-index: 100;
		}
	</style>
</head>

<body>
	<div id="info">
		<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> -
		Float volume render test (mip / isosurface)
	</div>
	<div id="inset"></div>

	<script src="../build/three.js"></script>

	<script src="js/controls/OrbitControls.js"></script>

	<script src="js/Volume.js"></script>
	<script src="js/loaders/NRRDLoader.js"></script>
	<script src="js/shaders/VolumeShader.js"></script>

	<script src="js/Detector.js"></script>
	<script src="js/libs/gunzip.min.js"></script>
	<script src="js/libs/dat.gui.min.js"></script>

	<script>

		if ( ! Detector.webgl ) { Detector.addGetWebGLMessage(); }

		var container,
			renderer,
			scene,
			camera,
			controls,
			volmaterial,
			volconfig,
			cmtextures,
			gui,
			drawrequested;

		init();

		function init() {

			scene = new THREE.Scene();

			// Create renderer
			var canvas = document.createElement( 'canvas' );
			var context = canvas.getContext( 'webgl2' );
			renderer = new THREE.WebGLRenderer( { canvas: canvas, context: context } );

			// Attach renderer to DOM
			container = document.createElement( 'div' );
			document.body.appendChild( container );
			container.appendChild( renderer.domElement );

			// Create camera (The volume renderer does not work very well with perspective yet)
			camera = new THREE.OrthographicCamera()
			camera.position.z = 1000;
			camera.near = 0.1;
			camera.far = 5000;
			camera.up = new THREE.Vector3( 0, 0, 1 );  // In our data, z is the up/down axis !!
			scene.add( camera );

			// Create controls
			controls = new THREE.OrbitControls( camera, renderer.domElement );
			controls.addEventListener( 'change', animate );
			controls.target.set( 64, 64, 128 );
			controls.enableDamping  = false;
			controls.update();

			// Lighting is backed into the shader a.t.m.
			// var dirLight = new THREE.DirectionalLight( 0xffffff );

			// The gui for interaction
			volconfig = { clim1: 0, clim2: 1, renderstyle: 'iso', isothreshold: 0.15, colormap: 'viridis' };
			var gui = new dat.GUI();
			gui.add( volconfig, 'clim1', 0, 1, 0.01 ).onChange( updateUniforms );
			gui.add( volconfig, 'clim2', 0, 1, 0.01 ).onChange( updateUniforms );
			gui.add( volconfig, 'colormap', { gray: 'gray', viridis: 'viridis' } ).onChange( updateUniforms );
			gui.add( volconfig, 'renderstyle', { mip: 'mip', iso: 'iso' } ).onChange( updateUniforms );
			gui.add( volconfig, 'isothreshold', 0, 1, 0.01 ).onChange( updateUniforms );

			// Keep track of window size (and initialize now)
			window.addEventListener( 'resize', onWindowResize, false );
			onWindowResize();

			// Load the data ...
			var loader = new THREE.NRRDLoader();
			loader.load( "models/nrrd/stent.nrrd", function ( volume ) {
				window.volume = volume;
				// Texture to hold the volume. We have scalars, so we put our data in the red channel.
				// THREEJS will select R32F (33326) based on the RedFormat and FloatType.
				// Also see https://www.khronos.org/registry/webgl/specs/latest/2.0/#TEXTURE_TYPES_FORMATS_FROM_DOM_ELEMENTS_TABLE
				// TODO: look the dtype up in the volume metadata
				var texture = new THREE.Texture3D( volume.data, volume.xLength, volume.yLength, volume.zLength );
				texture.format = THREE.RedFormat;
				texture.type = THREE.FloatType;
				texture.minFilter = texture.magFilter = THREE.LinearFilter;
				texture.unpackAlignment = 1;
				texture.needsUpdate = true;

				// Colormap textures
				cmtextures = {
					viridis: new THREE.TextureLoader().load( 'textures/cm_viridis.png' ),
					gray: new THREE.TextureLoader().load( 'textures/cm_gray.png' )
				};

				// Material (shaders) to render the volume using raycasting
				volmaterial = new THREE.ShaderMaterial( THREE.VolumeRenderShader1 );
				volmaterial.side = THREE.BackSide;  // The volume shader uses the backface as its "reference point"

				// Apply standard volume material uniform info
				volmaterial.uniforms.u_data.value = texture;
				volmaterial.uniforms.u_size.value = [ volume.xLength, volume.yLength, volume.zLength ];

				// Geometry for the volume
				var volgeometry = new THREE.BoxGeometry( volume.xLength, volume.yLength, volume.zLength );
				volgeometry = volgeometry.translate( volume.xLength / 2 - 0.5, volume.yLength / 2 - 0.5, volume.zLength / 2 - 0.5 );
				var volcube = new THREE.Mesh( volgeometry, volmaterial );
				scene.add( volcube );

				// Apply uniforms now, this will call animate(), but apparently that's not enough sometimes
				this.updateUniforms();
				window.setTimeout(animate, 100);
				window.setTimeout(animate, 1000);

			} );

		}

		function updateUniforms() {

			volmaterial.uniforms.u_clim.value = [ volconfig.clim1, volconfig.clim2 ];
			volmaterial.uniforms.u_renderstyle.value = volconfig.renderstyle == 'mip' ? 0 : 1; // 0: MIP, 1: ISO
			volmaterial.uniforms.u_renderthreshold.value = volconfig.isothreshold;  // For ISO renderstyle
			volmaterial.uniforms.u_cmdata.value = cmtextures[volconfig.colormap];

			volmaterial.needsUpdate = true;
			animate();

		}

		function onWindowResize() {

			camera.right = window.innerWidth / 5.0;
			camera.left = -camera.right;
			camera.top = window.innerHeight / 5.0;
			camera.bottom = -camera.top;
			camera.updateProjectionMatrix();

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

			if (controls.handleResize) { controls.handleResize(); }

			animate();
		}

		function animate() {

			// throttled animate function
			if ( !drawrequested ) {
				drawrequested = true;
				window.requestAnimationFrame( _animate );
			}

		}

		function _animate() {

			drawrequested = false;
			renderer.render( scene, camera );

		}

	</script>

</body>
</html>