javascript
/
three.js
spegling av 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/TrackballControls.js"></script>

	<script src="js/Volume.js"></script>
	<script src="js/VolumeSlice.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/stats.min.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,
			stats,
			camera,
			controls,
			scene,
			renderer,
			gui,
			container2,
			renderer2,
			camera2,
			axes2,
			scene2;

		init();
		animate();

		function init() {

			// The volume renderer does not work very well with perspective yet
			//camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.01, 1e10 );
			camera = new THREE.OrthographicCamera()
			camera.position.z = 1000;
			this.camera.right = window.innerWidth / 5.0;
			this.camera.left = -this.camera.right;
			this.camera.top = window.innerHeight / 5.0;
			this.camera.bottom = -this.camera.top;
			this.camera.near = 0.1;
			this.camera.far = 5000;
			this.camera.updateProjectionMatrix();

			scene = new THREE.Scene();

			scene.add( camera );

			// light

			var dirLight = new THREE.DirectionalLight( 0xffffff );
			dirLight.position.set( 200, 200, 1000 ).normalize();

			camera.add( dirLight );
			camera.add( dirLight.target );

			var loader = new THREE.NRRDLoader();
			loader.load( "models/nrrd/stent.nrrd", function ( 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, THREE.RedFormat, THREE.FloatType);
				texture.minFilter = texture.magFilter = THREE.LinearFilter;
				texture.unpackAlignment = 1;
				texture.needsUpdate = true;

				// Colormap texture
				var cmtexture = new THREE.TextureLoader().load( 'textures/cm_viridis.png' );  // e.g. cm_gray or cm_viridis

				// Material (shaders) to render the volume using raycasting
				var volmaterial = new THREE.ShaderMaterial( THREE.ShaderLib['volumerender1'] );
				volmaterial.side = THREE.BackSide;  // The volume shader uses the backface as its "reference point"

				// Apply volume material uniform info
				volmaterial.uniforms.u_data = { type: 't', value: texture };
				volmaterial.uniforms.u_cmdata = { type: 't', value: cmtexture };
				volmaterial.uniforms.u_size = { type: 'v3', value: [volume.xLength, volume.yLength, volume.zLength] };
				volmaterial.uniforms.u_renderstyle = {type: 'int', value: 0}; // 0: MIP, 1: ISO
				volmaterial.uniforms.u_renderthreshold = {type: 'f', value: 0.3};  // For ISO renderstyle
				volmaterial.uniforms.u_clim = {type: 'v2', value: [0, 1]};
				volmaterial.needsUpdate = true;

				// 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 );

				// TODO: the texture coordinates currently map directly to world coordinates. That's why we translate
				// the geometry above. But the extractSlice() below assume that the volume is centered at the origin.
				// We'd need to add a material attribute with texture coordinates to fix this.
				return;

				//z plane
				var indexZ = 0;
				var sliceZ = volume.extractSlice('z',Math.floor(volume.RASDimensions[2]/4));
				scene.add( sliceZ.mesh );

				//y plane
				var indexY = 0;
				var sliceY = volume.extractSlice('y',Math.floor(volume.RASDimensions[1]/2));
				scene.add( sliceY.mesh );

				//x plane
				var indexX = 0;
				var sliceX = volume.extractSlice('x',Math.floor(volume.RASDimensions[0]/2));
				scene.add( sliceX.mesh );

				gui.add( sliceX, "index", 0, volume.RASDimensions[0], 1 ).name( "indexX" ).onChange( function () {sliceX.repaint.call(sliceX);} );
				gui.add( sliceY, "index", 0, volume.RASDimensions[1], 1 ).name( "indexY" ).onChange( function () {sliceY.repaint.call(sliceY);} );
				gui.add( sliceZ, "index", 0, volume.RASDimensions[2], 1 ).name( "indexZ" ).onChange( function () {sliceZ.repaint.call(sliceZ);} );

				gui.add( volume, "lowerThreshold", volume.min, volume.max, 1).name( "Lower Threshold").onChange( function () {
					volume.repaintAllSlices();
				});
				gui.add( volume, "upperThreshold", volume.min, volume.max, 1).name( "Upper Threshold").onChange( function () {
					volume.repaintAllSlices();
				});
				gui.add( volume, "windowLow", volume.min, volume.max, 1).name( "Window Low").onChange( function () {
					volume.repaintAllSlices();
				});
				gui.add( volume, "windowHigh", volume.min, volume.max, 1).name( "Window High").onChange( function () {
					volume.repaintAllSlices();
				});

			} );

			// renderer
			var canvas = document.createElement( 'canvas' );
			var context = canvas.getContext( 'webgl2' );
			renderer = new THREE.WebGLRenderer( { canvas: canvas, context: context } );
			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );

			container = document.createElement( 'div' );
			document.body.appendChild( container );
			container.appendChild( renderer.domElement );

			controls = new THREE.TrackballControls( camera, renderer.domElement );
			controls.rotateSpeed = 5.0;
			controls.zoomSpeed = 5;
			controls.panSpeed = 2;
			controls.noZoom = false;
			controls.noPan = false;
			controls.staticMoving = true;
			controls.dynamicDampingFactor = 0.3;

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

			var gui = new dat.GUI();

			setupInset();

			window.addEventListener( 'resize', onWindowResize, false );

		}

		function onWindowResize() {

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

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

			controls.handleResize();

		}

		function animate() {

			requestAnimationFrame( animate );

			controls.update();

			//copy position of the camera into inset
			camera2.position.copy( camera.position );
			camera2.position.sub( controls.target );
			camera2.position.setLength( 300 );
			camera2.lookAt( scene2.position );

			renderer.render( scene, camera );
			renderer2.render( scene2, camera2);

			stats.update();

		}

		function rotateAroundWorldAxis(object, axis, radians) {
			var rotWorldMatrix = new THREE.Matrix4();
			rotWorldMatrix.makeRotationAxis(axis.normalize(), radians);

			object.applyMatrix(rotWorldMatrix);

		}

		function setupInset () {
			var insetWidth = 150,
				insetHeight = 150;
			container2 = document.getElementById('inset');
			container2.width = insetWidth;
			container2.height = insetHeight;

			// renderer
			renderer2 = new THREE.WebGLRenderer( {alpha : true} );
			renderer2.setClearColor( 0x000000, 0 );
			renderer2.setSize( insetWidth, insetHeight );
			container2.appendChild( renderer2.domElement );

			// scene
			scene2 = new THREE.Scene();

			// camera
			camera2 = new THREE.PerspectiveCamera( 50, insetWidth / insetHeight, 1, 1000 );
			camera2.up = camera.up; // important!

			// axes
			axes2 = new THREE.AxesHelper( 100 );
			scene2.add( axes2 );
		}

	</script>

</body>
</html>