1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  * based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Cube.as
  4  */
  5 
  6 /**@constructor*/
  7 THREE.CubeGeometry = function ( width, height, depth, widthSegments, heightSegments, depthSegments ) {
  8 
  9 	THREE.Geometry.call( this );
 10 
 11 	var scope = this;
 12 
 13 	this.width = width;
 14 	this.height = height;
 15 	this.depth = depth;
 16 
 17 	this.widthSegments = widthSegments || 1;
 18 	this.heightSegments = heightSegments || 1;
 19 	this.depthSegments = depthSegments || 1;
 20 
 21 	var width_half = this.width / 2;
 22 	var height_half = this.height / 2;
 23 	var depth_half = this.depth / 2;
 24 
 25 	buildPlane( 'z', 'y', - 1, - 1, this.depth, this.height, width_half, 0 ); // px
 26 	buildPlane( 'z', 'y',   1, - 1, this.depth, this.height, - width_half, 1 ); // nx
 27 	buildPlane( 'x', 'z',   1,   1, this.width, this.depth, height_half, 2 ); // py
 28 	buildPlane( 'x', 'z',   1, - 1, this.width, this.depth, - height_half, 3 ); // ny
 29 	buildPlane( 'x', 'y',   1, - 1, this.width, this.height, depth_half, 4 ); // pz
 30 	buildPlane( 'x', 'y', - 1, - 1, this.width, this.height, - depth_half, 5 ); // nz
 31 
 32 	function buildPlane( u, v, udir, vdir, width, height, depth, materialIndex ) {
 33 
 34 		var w, ix, iy,
 35 		gridX = scope.widthSegments,
 36 		gridY = scope.heightSegments,
 37 		width_half = width / 2,
 38 		height_half = height / 2,
 39 		offset = scope.vertices.length;
 40 
 41 		if ( ( u === 'x' && v === 'y' ) || ( u === 'y' && v === 'x' ) ) {
 42 
 43 			w = 'z';
 44 
 45 		} else if ( ( u === 'x' && v === 'z' ) || ( u === 'z' && v === 'x' ) ) {
 46 
 47 			w = 'y';
 48 			gridY = scope.depthSegments;
 49 
 50 		} else if ( ( u === 'z' && v === 'y' ) || ( u === 'y' && v === 'z' ) ) {
 51 
 52 			w = 'x';
 53 			gridX = scope.depthSegments;
 54 
 55 		}
 56 
 57 		var gridX1 = gridX + 1,
 58 		gridY1 = gridY + 1,
 59 		segment_width = width / gridX,
 60 		segment_height = height / gridY,
 61 		normal = new THREE.Vector3();
 62 
 63 		normal[ w ] = depth > 0 ? 1 : - 1;
 64 
 65 		for ( iy = 0; iy < gridY1; iy ++ ) {
 66 
 67 			for ( ix = 0; ix < gridX1; ix ++ ) {
 68 
 69 				var vector = new THREE.Vector3();
 70 				vector[ u ] = ( ix * segment_width - width_half ) * udir;
 71 				vector[ v ] = ( iy * segment_height - height_half ) * vdir;
 72 				vector[ w ] = depth;
 73 
 74 				scope.vertices.push( vector );
 75 
 76 			}
 77 
 78 		}
 79 
 80 		for ( iy = 0; iy < gridY; iy++ ) {
 81 
 82 			for ( ix = 0; ix < gridX; ix++ ) {
 83 
 84 				var a = ix + gridX1 * iy;
 85 				var b = ix + gridX1 * ( iy + 1 );
 86 				var c = ( ix + 1 ) + gridX1 * ( iy + 1 );
 87 				var d = ( ix + 1 ) + gridX1 * iy;
 88 
 89 				var face = new THREE.Face4( a + offset, b + offset, c + offset, d + offset );
 90 				face.normal.copy( normal );
 91 				face.vertexNormals.push( normal.clone(), normal.clone(), normal.clone(), normal.clone() );
 92 				face.materialIndex = materialIndex;
 93 
 94 				scope.faces.push( face );
 95 				scope.faceVertexUvs[ 0 ].push( [
 96 							new THREE.UV( ix / gridX, 1 - iy / gridY ),
 97 							new THREE.UV( ix / gridX, 1 - ( iy + 1 ) / gridY ),
 98 							new THREE.UV( ( ix + 1 ) / gridX, 1- ( iy + 1 ) / gridY ),
 99 							new THREE.UV( ( ix + 1 ) / gridX, 1 - iy / gridY )
100 						] );
101 
102 			}
103 
104 		}
105 
106 	}
107 
108 	this.computeCentroids();
109 	this.mergeVertices();
110 
111 };
112 
113 THREE.CubeGeometry.prototype = Object.create( THREE.Geometry.prototype );
114 

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