1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  */
  4 
  5 /**@constructor*/
  6 THREE.CylinderGeometry = function ( radiusTop, radiusBottom, height, radiusSegments, heightSegments, openEnded ) {
  7 
  8 	THREE.Geometry.call( this );
  9 
 10 	radiusTop = radiusTop !== undefined ? radiusTop : 20;
 11 	radiusBottom = radiusBottom !== undefined ? radiusBottom : 20;
 12 	height = height !== undefined ? height : 100;
 13 
 14 	var heightHalf = height / 2;
 15 	var segmentsX = radiusSegments || 8;
 16 	var segmentsY = heightSegments || 1;
 17 
 18 	var x, y, vertices = [], uvs = [];
 19 
 20 	for ( y = 0; y <= segmentsY; y ++ ) {
 21 
 22 		var verticesRow = [];
 23 		var uvsRow = [];
 24 
 25 		var v = y / segmentsY;
 26 		var radius = v * ( radiusBottom - radiusTop ) + radiusTop;
 27 
 28 		for ( x = 0; x <= segmentsX; x ++ ) {
 29 
 30 			var u = x / segmentsX;
 31 
 32 			var vertex = new THREE.Vector3();
 33 			vertex.x = radius * Math.sin( u * Math.PI * 2 );
 34 			vertex.y = - v * height + heightHalf;
 35 			vertex.z = radius * Math.cos( u * Math.PI * 2 );
 36 
 37 			this.vertices.push( vertex );
 38 
 39 			verticesRow.push( this.vertices.length - 1 );
 40 			uvsRow.push( new THREE.UV( u, 1 - v ) );
 41 
 42 		}
 43 
 44 		vertices.push( verticesRow );
 45 		uvs.push( uvsRow );
 46 
 47 	}
 48 
 49 	var tanTheta = ( radiusBottom - radiusTop ) / height;
 50 	var na, nb;
 51 
 52 	for ( x = 0; x < segmentsX; x ++ ) {
 53 
 54 		if ( radiusTop !== 0 ) {
 55 
 56 			na = this.vertices[ vertices[ 0 ][ x ] ].clone();
 57 			nb = this.vertices[ vertices[ 0 ][ x + 1 ] ].clone();
 58 
 59 		} else {
 60 
 61 			na = this.vertices[ vertices[ 1 ][ x ] ].clone();
 62 			nb = this.vertices[ vertices[ 1 ][ x + 1 ] ].clone();
 63 
 64 		}
 65 
 66 		na.setY( Math.sqrt( na.x * na.x + na.z * na.z ) * tanTheta ).normalize();
 67 		nb.setY( Math.sqrt( nb.x * nb.x + nb.z * nb.z ) * tanTheta ).normalize();
 68 
 69 		for ( y = 0; y < segmentsY; y ++ ) {
 70 
 71 			var v1 = vertices[ y ][ x ];
 72 			var v2 = vertices[ y + 1 ][ x ];
 73 			var v3 = vertices[ y + 1 ][ x + 1 ];
 74 			var v4 = vertices[ y ][ x + 1 ];
 75 
 76 			var n1 = na.clone();
 77 			var n2 = na.clone();
 78 			var n3 = nb.clone();
 79 			var n4 = nb.clone();
 80 
 81 			var uv1 = uvs[ y ][ x ].clone();
 82 			var uv2 = uvs[ y + 1 ][ x ].clone();
 83 			var uv3 = uvs[ y + 1 ][ x + 1 ].clone();
 84 			var uv4 = uvs[ y ][ x + 1 ].clone();
 85 
 86 			this.faces.push( new THREE.Face4( v1, v2, v3, v4, [ n1, n2, n3, n4 ] ) );
 87 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3, uv4 ] );
 88 
 89 		}
 90 
 91 	}
 92 
 93 	// top cap
 94 
 95 	if ( !openEnded && radiusTop > 0 ) {
 96 
 97 		this.vertices.push( new THREE.Vector3( 0, heightHalf, 0 ) );
 98 
 99 		for ( x = 0; x < segmentsX; x ++ ) {
100 
101 			var v1 = vertices[ 0 ][ x ];
102 			var v2 = vertices[ 0 ][ x + 1 ];
103 			var v3 = this.vertices.length - 1;
104 
105 			var n1 = new THREE.Vector3( 0, 1, 0 );
106 			var n2 = new THREE.Vector3( 0, 1, 0 );
107 			var n3 = new THREE.Vector3( 0, 1, 0 );
108 
109 			var uv1 = uvs[ 0 ][ x ].clone();
110 			var uv2 = uvs[ 0 ][ x + 1 ].clone();
111 			var uv3 = new THREE.UV( uv2.u, 0 );
112 
113 			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
114 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );
115 
116 		}
117 
118 	}
119 
120 	// bottom cap
121 
122 	if ( !openEnded && radiusBottom > 0 ) {
123 
124 		this.vertices.push( new THREE.Vector3( 0, - heightHalf, 0 ) );
125 
126 		for ( x = 0; x < segmentsX; x ++ ) {
127 
128 			var v1 = vertices[ y ][ x + 1 ];
129 			var v2 = vertices[ y ][ x ];
130 			var v3 = this.vertices.length - 1;
131 
132 			var n1 = new THREE.Vector3( 0, - 1, 0 );
133 			var n2 = new THREE.Vector3( 0, - 1, 0 );
134 			var n3 = new THREE.Vector3( 0, - 1, 0 );
135 
136 			var uv1 = uvs[ y ][ x + 1 ].clone();
137 			var uv2 = uvs[ y ][ x ].clone();
138 			var uv3 = new THREE.UV( uv2.u, 1 );
139 
140 			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
141 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );
142 
143 		}
144 
145 	}
146 
147 	this.computeCentroids();
148 	this.computeFaceNormals();
149 
150 }
151 
152 THREE.CylinderGeometry.prototype = Object.create( THREE.Geometry.prototype );
153 

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