examples/webgl_geometry_subdivison.html

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<html lang="en">
	<head>
		<title>three.js webgl - geometry - Subdivisions with Catmull-Clark</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: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}
		</style>
	</head>
	<body>

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

		<script src="js/Stats.js"></script>

		<script src="../src/core/Geometry.js"></script>
		<script src="../src/extras/geometries/CubeGeometry.js"></script>
		<script src="../src/extras/geometries/CylinderGeometry.js"></script>
		<script src="../src/extras/geometries/TorusGeometry.js"></script>
		<script src="../src/extras/geometries/LatheGeometry.js"></script>
		<script src="../src/extras/modifiers/SubdivisionModifier.js"></script>

		<script src="fonts/helvetiker_regular.typeface.js"></script>

		<script>

			var container, stats;

			var camera, scene, renderer;

			var cube, plane;

			var targetYRotation = targetXRotation = 0;
			var targetYRotationOnMouseDown = targetXRotationOnMouseDown = 0;

			var mouseX = 0, mouseY = 0;
			var mouseXOnMouseDown = 0;

			var windowHalfX = window.innerWidth / 2;
			var windowHalfY = window.innerHeight / 2;


			// Create new object by parameters

			var createSomething = function( klass, args ) {

				var F = function( klass, args ) {

				    return klass.apply( this, args );

				}

				F.prototype = klass.prototype;

				return new F( klass, args );

			};


			// Cube

			var materials = [];

			for ( var i = 0; i < 6; i ++ ) {

				materials.push( [ new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff, wireframe: false } ) ] );

			}


			var geometriesParams = [

				{ type: 'CubeGeometry', args: [ 200, 200, 200, 2, 2, 2, materials ] },
				{ type: 'TorusGeometry', args: [ 100, 60, 4, 8, Math.PI*2 ] },
				{ type: 'TorusKnotGeometry', args: [  ], scale:0.25, meshScale:4 },
				{ type: 'SphereGeometry', args: [ 100, 3, 3 ], meshScale:2 },
				{ type: 'IcosahedronGeometry', args: [ 100, 1 ], meshScale:2 },
				{ type: 'CylinderGeometry', args: [ 25, 75, 200, 8, 3 ]} ,
				{ type: 'OctahedronGeometry', args: [200, 0], meshScale:2 },
				{ type: 'LatheGeometry', args: [ [
					new THREE.Vector3(0,0,0),
					new THREE.Vector3(0,50,50),
					new THREE.Vector3(0,10,100),
					new THREE.Vector3(0,50,150),
					new THREE.Vector3(0,0,200) ] ]},
				{ type: 'TextGeometry', args: ['&', {
										size: 200,
										height: 50,
										curveSegments: 1,
										font: "helvetiker"

									}]},
				{ type: 'PlaneGeometry', args: [ 200, 200, 4, 4 ] }

			];

			if (location.protocol !== "file:") {
				var loader = new THREE.JSONLoader();
				loader.load( 'obj/WaltHeadLo.js', function ( geometry ) {

					geometriesParams.push({type: 'WaltHead', args: [ ], meshScale: 6 });

					THREE.WaltHead = function() {
						return THREE.GeometryUtils.clone(geometry);
					};

					updateInfo()

				});

				var loader2 = new THREE.JSONLoader();
				loader2.load( 'obj/Suzanne.js', function ( geometry ) {

					geometriesParams.push({type: 'Suzanne', args: [ ], scale: 100, meshScale:2 });

					THREE.Suzanne = function() {
						return THREE.GeometryUtils.clone(geometry);
					};

					updateInfo()

				} );

			}


			var info;
			var subdivisions = 2;
			var geometryIndex = 0;

			// start scene

			init();
			animate();

			function nextSubdivision( x ) {

				subdivisions = Math.max( 0, subdivisions + x );
				addStuff();

			}

			function nextGeometry() {

				geometryIndex ++;

				if ( geometryIndex > geometriesParams.length - 1 ) {

					geometryIndex = 0;

				}

				addStuff();

			}

			function switchGeometry(i) {

				geometryIndex = i;

				addStuff();
			}

			function updateInfo() {

				var params = geometriesParams[ geometryIndex ];

				var dropdown = '<select id="dropdown" onchange="switchGeometry(this.value)">';

				for (  i = 0; i < geometriesParams.length; i ++ ) {
					dropdown += '<option value="' + i + '"';

					dropdown += (geometryIndex == i)  ? ' selected' : '';

					dropdown += '>' + geometriesParams[i].type + '</option>';
				}

				dropdown += '</select>';

				info.innerHTML = 'Drag to spin THREE.' + params.type +

				 	'<br><br>Subdivisions: '  + subdivisions +
					' <a href="#" onclick="nextSubdivision(1); return false;">more</a>/<a href="#" onclick="nextSubdivision(-1); return false;">less</a>' +
					'<br>Geometry: ' + dropdown + ' <a href="#" onclick="nextGeometry();return false;">next</a>' +
					'<br><br>Vertices count: before ' + geometry.vertices.length + ' after ' + smooth.vertices.length +
					'<br>Face count: before ' + geometry.faces.length + ' after ' + smooth.faces.length
				; //+ params.args;
			}

			function addStuff() {

				if ( cube ) {

					scene.remove( group );
					scene.remove( cube );

				}


				var modifier = new THREE.SubdivisionModifier( subdivisions );


				var params = geometriesParams[ geometryIndex ];

				geometry = createSomething( THREE[ params.type ], params.args );

				// Scale Geometry

				if ( params.scale ) {

					geometry.applyMatrix( new THREE.Matrix4().makeScale( params.scale, params.scale, params.scale ) );

				}

				// Cloning original geometry for debuging

				smooth = THREE.GeometryUtils.clone( geometry );

				// mergeVertices(); is run in case of duplicated vertices
				smooth.mergeVertices();
				
				smooth.computeCentroids();
				smooth.computeFaceNormals();
				smooth.computeVertexNormals();
				
				modifier.modify( smooth );

				updateInfo();

				var faceABCD = "abcd";
				var color, f, p, n, vertexIndex;

				for ( i = 0; i < smooth.faces.length; i ++ ) {

					f  = smooth.faces[ i ];


					n = ( f instanceof THREE.Face3 ) ? 3 : 4;

					for( var j = 0; j < n; j++ ) {

						vertexIndex = f[ faceABCD.charAt( j ) ];

						p = smooth.vertices[ vertexIndex ];

						color = new THREE.Color( 0xffffff );
						color.setHSV( ( p.y ) / 200 + 0.5, 1.0, 1.0 );

						f.vertexColors[ j ] = color;

					}

				}


				group = new THREE.Object3D();
				group.add( new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: 0xfefefe, wireframe: true, opacity: 0.5 } ) ) );
				scene.add( group );


				var debugNewPoints = false;
				var debugOldPoints = false;

				// Debug new Points

				if (debugNewPoints) {
					var PI2 = Math.PI * 2;
					var program = function ( context ) {

						context.beginPath();
						context.arc( 0, 0, 1, 0, PI2, true );
						context.closePath();
						context.fill();

					}

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

						particle = new THREE.Particle( new THREE.ParticleCanvasMaterial( { color: Math.random() * 0x808008 + 0x808080, program: program } ) );
						particle.position = smooth.vertices[ i ];
						var pos = smooth.vertices.position
						particle.scale.x = particle.scale.y = 5;
						group.add( particle );
					}

				}


				//Debug original points

				if (debugOldPoints) {

					var drawText = function(i) {

						return function ( context ) {

							context.beginPath();
							context.scale(0.1,-0.1);

							context.fillText(i, 0,0);

						};

					}

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

						particle = new THREE.Particle( new THREE.ParticleCanvasMaterial( { color: Math.random() * 0x808008 + 0x808080, program: drawText(i) } ) );
						particle.position = smooth.vertices[ i ];
						var pos = geometry.vertices.position
						particle.scale.x = particle.scale.y = 30;
						group.add( particle );
					}
				}


				var meshmaterials = [
					new THREE.MeshLambertMaterial( { color: 0xffffff, shading: THREE.FlatShading, vertexColors: THREE.VertexColors } ),
					new THREE.MeshBasicMaterial( { color: 0x405040, wireframe: true, opacity: 0.8, transparent: true } )
				];

				cube = THREE.SceneUtils.createMultiMaterialObject( smooth, meshmaterials );

				var meshScale =  params.meshScale ? params.meshScale : 1;

				cube.scale.x = meshScale;
				cube.scale.y = meshScale;
				cube.scale.z = meshScale;

				scene.add( cube );

				group.scale.copy( cube.scale );

			}

			function init() {

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

				info = document.createElement( 'div' );
				info.style.position = 'absolute';
				info.style.top = '10px';
				info.style.width = '100%';
				info.style.textAlign = 'center';
				info.innerHTML = 'Drag to spin the geometry ';
				container.appendChild( info );

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.z = 500;
				scene.add( camera );

				var light = new THREE.PointLight( 0xffffff, 1.5 );
				light.position.set( 1000, 1000, 2000 );
				scene.add( light );

				addStuff();

				renderer = new THREE.WebGLRenderer( { antialias: true } ); // WebGLRenderer CanvasRenderer
				renderer.setSize( window.innerWidth, window.innerHeight );

				container.appendChild( renderer.domElement );

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				container.appendChild( stats.domElement );

				document.addEventListener( 'mousedown', onDocumentMouseDown, false );
				document.addEventListener( 'touchstart', onDocumentTouchStart, false );
				document.addEventListener( 'touchmove', onDocumentTouchMove, false );

			}

			//

			function onDocumentMouseDown( event ) {

				//event.preventDefault();

				document.addEventListener( 'mousemove', onDocumentMouseMove, false );
				document.addEventListener( 'mouseup', onDocumentMouseUp, false );
				document.addEventListener( 'mouseout', onDocumentMouseOut, false );

				mouseXOnMouseDown = event.clientX - windowHalfX;
				mouseYOnMouseDown = event.clientY - windowHalfY;
				targetYRotationOnMouseDown = targetYRotation;
				targetXRotationOnMouseDown = targetXRotation;
			}

			function onDocumentMouseMove( event ) {

				mouseX = event.clientX - windowHalfX;
				mouseY = event.clientY - windowHalfY;

				targetYRotation = targetYRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
				targetXRotation = targetXRotationOnMouseDown + ( mouseY - mouseYOnMouseDown ) * 0.02;

			}

			function onDocumentMouseUp( event ) {

				document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
				document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
				document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
			}

			function onDocumentMouseOut( event ) {

				document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
				document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
				document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
			}

			function onDocumentTouchStart( event ) {

				if ( event.touches.length == 1 ) {

					event.preventDefault();

					mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
					targetRotationOnMouseDown = targetRotation;

				}
			}

			function onDocumentTouchMove( event ) {

				if ( event.touches.length == 1 ) {

					event.preventDefault();

					mouseX = event.touches[ 0 ].pageX - windowHalfX;
					targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;

				}
			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				group.rotation.x = cube.rotation.x += ( targetXRotation - cube.rotation.x ) * 0.05;
				group.rotation.y = cube.rotation.y += ( targetYRotation - cube.rotation.y ) * 0.05;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>