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webgl_materials_curvature.html 9.7 KB
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<!DOCTYPE html>
<html lang="en">
	<head>
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		<title>three.js webgl - shader - curvature [ninja]</title>
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		<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: #ffffff;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
				font-weight: bold;

				background-color: #000000;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
			}

			a {

				color: #ffffff;
			}

			#oldie a { color:#da0 }
		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - curvature estimation of a geometry by <a href="http://codercat.club" target="_blank" rel="noopener">CoderCat</a></div>
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		<script src="../build/three.js"></script>
		<script src="js/Detector.js"></script>

		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/loaders/OBJLoader.js"></script>
		<script src="js/libs/dat.gui.min.js"></script>
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		<script id="vertexShaderRaw" type="x-shader/x-vertex">

		attribute float curvature;

		varying float vCurvature;

		void main() {

			vec3 p = position;
			vec4 modelViewPosition = modelViewMatrix * vec4( p , 1.0 );
			gl_Position = projectionMatrix * modelViewPosition;
			vCurvature = curvature;
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		}

		</script>

		<script id="fragmentShaderRaw" type="x-shader/x-fragment">

		varying vec3 vViewPosition;
		varying float vCurvature;

		void main() {
				gl_FragColor = vec4( vCurvature * 2.0, 0.0, 0.0, 0.0 );
		}

		</script>

		<script>

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

			var container;
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			var camera, scene, renderer;
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			var ninjaMeshRaw, curvatureAttribute;
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			init();
			animate();

			//returns average of elements in a dictionary
			function average( dict ) {

				var sum = 0;
				var length = 0;

				Object.keys( dict ).forEach( function( key ) {

					sum += dict[ key ];
					length ++;

				});

				return sum / length;

			}

			//clamp a number between min and max
			function clamp( number, min, max ) {

			  return Math.max( min, Math.min( number, max ) );

			}

			//filter the curvature array to only show concave values
			function filterConcave( curvature ) {

				for ( var i = 0; i < curvature.length; i++ ) {

					curvature[ i ] = Math.abs( clamp( curvature[ i ], -1, 0 ) );

				}

			}

			//filter the curvature array to only show convex values
			function filterConvex( curvature ) {

				for ( var i = 0; i < curvature.length; i++ ) {

					curvature[ i ] = clamp( curvature[ i ], 0, 1 );

				}

			}

			//filter the curvature array to show both the concave and convex values
			function filterBoth( curvature ) {

				for ( var i = 0; i < curvature.length; i++ ) {

					curvature[ i ] = Math.abs( curvature[ i ] );

				}

			}

			//initialize the scene
			function init() {
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				scene = new THREE.Scene();
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				camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
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				camera.position.x = -23;
				camera.position.y = 2;
				camera.position.z = 24;
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				controls = new THREE.OrbitControls( camera );

				renderer = new THREE.WebGLRenderer();
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.autoClear = false;

				document.body.appendChild( renderer.domElement );

				var loader = new THREE.OBJLoader();
				//load the obj
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				loader.load( 'models/obj/ninja/ninjaHead_Low.obj', function ( object ) {
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					object.traverse( function ( child ) {
						if ( child instanceof THREE.Mesh ) {

							bufferGeo = child.geometry;
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							bufferGeo.center();
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							var dict= {};

							for ( var i = 0; i < bufferGeo.attributes.position.count; i+=3 ) {
								//create a dictionary of every position, and its neighboring positions
								var array = bufferGeo.attributes.position.array;
								var normArray = bufferGeo.attributes.normal.array;

								var posA = new THREE.Vector3(array[ 3 * i ], array[ 3 * i + 1 ], array[ 3 * i + 2 ]);
								var posB = new THREE.Vector3(array[ 3 * ( i + 1 ) ], array[ 3 * ( i + 1 ) + 1 ], array[ 3 * ( i + 1 ) + 2 ]);
								var posC = new THREE.Vector3(array[ 3 * ( i + 2 ) ], array[ 3 * ( i + 2 ) + 1 ], array[ 3 * ( i + 2 ) + 2 ]);

								var normA = new THREE.Vector3(normArray[ 3 * i ], normArray[ 3 * i + 1 ], normArray[ 3 * i + 2 ]).normalize();
								var normB = new THREE.Vector3(normArray[ 3 * ( i + 1 ) ], normArray[ 3 * ( i + 1 ) + 1 ], normArray[ 3 * ( i + 1 ) + 2 ]).normalize();
								var normC = new THREE.Vector3(normArray[ 3 * ( i + 2 ) ], normArray[ 3 * ( i + 2 ) + 1 ], normArray[ 3 * ( i + 2 ) + 2 ]).normalize();

								var strA = posA.toArray().toString();
								var strB = posB.toArray().toString();
								var strC = posC.toArray().toString();

								var posB_A = new THREE.Vector3().subVectors( posB, posA );
								var posB_C = new THREE.Vector3().subVectors( posB, posC );
								var posC_A = new THREE.Vector3().subVectors( posC, posA );

								var normB_A = new THREE.Vector3().subVectors( normB, normA );
								var normB_C = new THREE.Vector3().subVectors( normB, normC );
								var normC_A = new THREE.Vector3().subVectors( normC, normA );
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								var b2a = normB.dot( posB_A.normalize() );
								var b2c = normB.dot( posB_C.normalize() );
								var c2a = normC.dot( posC_A.normalize() );
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								var a2b = -normA.dot( posB_A.normalize() );
								var c2b = -normC.dot( posB_C.normalize() );
								var a2c = -normA.dot( posC_A.normalize() );
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								if (dict[ strA ] === undefined ) {
									dict[ strA ] = {};
								}
								if (dict[ strB ] === undefined ) {
									dict[ strB ] = {};
								}
								if (dict[ strC ] === undefined ) {
									dict[ strC ] = {};
								}

								dict[ strA ][ strB ] = a2b;
								dict[ strA ][ strC ] = a2c;
								dict[ strB ][ strA ] = b2a;
								dict[ strB ][ strC ] = b2c;
								dict[ strC ][ strA ] = c2a;
								dict[ strC ][ strB ] = c2b;

							}

							curvatureDict = {};
							var min = 10, max = 0;

							Object.keys( dict ).forEach( function( key ) {
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								curvatureDict[ key ] = average( dict[ key ] );
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							});

							//smoothing
							var smoothCurvatureDict  = Object.create(curvatureDict);

							Object.keys( dict ).forEach( function( key ) {

								var count = 0;
								var sum = 0;
								Object.keys( dict[ key ] ).forEach( function( key2 ) {

									sum += smoothCurvatureDict[ key2 ];
									count ++;

								});
								smoothCurvatureDict[key] = sum / count;

							});

							curvatureDict = smoothCurvatureDict;

							// fit values to 0 and 1
							Object.keys( curvatureDict ).forEach( function( key ) {

								val = Math.abs( curvatureDict[ key ] );
								if ( val < min ) min = val;
								if ( val > max ) max = val;

							});

							var range = ( max - min );

							Object.keys( curvatureDict ).forEach( function( key ) {

								val = Math.abs( curvatureDict[ key ] );
								if ( curvatureDict[ key ] < 0 ) {
									curvatureDict[ key ] = (min - val) / range
								} else {
									curvatureDict[ key ] = (val - min) / range;
								}

							});

							curvatureAttribute = new Float32Array( bufferGeo.attributes.position.count );

							for ( var i = 0; i < bufferGeo.attributes.position.count; i++ ) {

								array = bufferGeo.attributes.position.array;
								var pos = new THREE.Vector3( array[ 3 * i ], array[ 3 * i + 1 ], array[ 3 * i + 2 ] );
								var str = pos.toArray().toString();
								curvatureAttribute[i] = curvatureDict[ str ];
							}

							bufferGeo.addAttribute( 'curvature', new THREE.BufferAttribute( curvatureAttribute, 1 ) );

							//starting filter is to show both concave and convex
							var curvatureFiltered = new Float32Array( curvatureAttribute );
							filterBoth(curvatureFiltered);

							var materialRaw = new THREE.ShaderMaterial ({
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								vertexShader: document.getElementById( 'vertexShaderRaw' ).textContent,
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								fragmentShader: document.getElementById( 'fragmentShaderRaw' ).textContent

							} );
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							ninjaMeshRaw = new THREE.Mesh( bufferGeo, materialRaw );
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						}
					} );
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					scene.add( ninjaMeshRaw );
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				} );


				//init GUI
				var params = {
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					filterConvex: function () {

						var curvatureFiltered = new Float32Array( curvatureAttribute );
						filterConvex(curvatureFiltered);
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						bufferGeo.attributes.curvature.array = curvatureFiltered;
						bufferGeo.attributes.curvature.needsUpdate = true;
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					},
					filterConcave: function () {

						var curvatureFiltered = new Float32Array( curvatureAttribute );
						filterConcave(curvatureFiltered);
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						bufferGeo.attributes.curvature.array = curvatureFiltered;
						bufferGeo.attributes.curvature.needsUpdate = true;
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					},
					filterBoth: function () {

						var curvatureFiltered = new Float32Array( curvatureAttribute );
						filterBoth(curvatureFiltered);
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						bufferGeo.attributes.curvature.array = curvatureFiltered;
						bufferGeo.attributes.curvature.needsUpdate = true;
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					}
				};

				var gui = new dat.GUI();

				topologyFolder = gui.addFolder( 'Topology' );
				topologyFolder.add( params, 'filterConvex' );
				topologyFolder.add( params, 'filterConcave' );
				topologyFolder.add( params, 'filterBoth' );
				topologyFolder.open()

				onWindowResize();

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

			}

			function onWindowResize( event ) {

				renderer.setSize( window.innerWidth, window.innerHeight );
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				camera.aspect = window.innerWidth / window.innerHeight;
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				camera.updateProjectionMatrix();

			}

			function animate() {

				requestAnimationFrame( animate );

				render();

			}

			function render() {
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				renderer.render(scene, camera);
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			}

		</script>

	</body>
</html>