1 /**
  2  * @author mrdoob / http://mrdoob.com/
  3  * based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Plane.as
  4  */
  5 
  6 /**@constructor*/
  7 THREE.PlaneGeometry = function ( width, height, widthSegments, heightSegments ) {
  8 
  9 	THREE.Geometry.call( this );
 10 
 11 	this.width = width;
 12 	this.height = height;
 13 
 14 	this.widthSegments = widthSegments || 1;
 15 	this.heightSegments = heightSegments || 1;
 16 
 17 	var ix, iz;
 18 	var width_half = width / 2;
 19 	var height_half = height / 2;
 20 
 21 	var gridX = this.widthSegments;
 22 	var gridZ = this.heightSegments;
 23 
 24 	var gridX1 = gridX + 1;
 25 	var gridZ1 = gridZ + 1;
 26 
 27 	var segment_width = this.width / gridX;
 28 	var segment_height = this.height / gridZ;
 29 
 30 	var normal = new THREE.Vector3( 0, 0, 1 );
 31 
 32 	for ( iz = 0; iz < gridZ1; iz ++ ) {
 33 
 34 		for ( ix = 0; ix < gridX1; ix ++ ) {
 35 
 36 			var x = ix * segment_width - width_half;
 37 			var y = iz * segment_height - height_half;
 38 
 39 			this.vertices.push( new THREE.Vector3( x, - y, 0 ) );
 40 
 41 		}
 42 
 43 	}
 44 
 45 	for ( iz = 0; iz < gridZ; iz ++ ) {
 46 
 47 		for ( ix = 0; ix < gridX; ix ++ ) {
 48 
 49 			var a = ix + gridX1 * iz;
 50 			var b = ix + gridX1 * ( iz + 1 );
 51 			var c = ( ix + 1 ) + gridX1 * ( iz + 1 );
 52 			var d = ( ix + 1 ) + gridX1 * iz;
 53 
 54 			var face = new THREE.Face4( a, b, c, d );
 55 			face.normal.copy( normal );
 56 			face.vertexNormals.push( normal.clone(), normal.clone(), normal.clone(), normal.clone() );
 57 
 58 			this.faces.push( face );
 59 			this.faceVertexUvs[ 0 ].push( [
 60 				new THREE.UV( ix / gridX, 1 - iz / gridZ ),
 61 				new THREE.UV( ix / gridX, 1 - ( iz + 1 ) / gridZ ),
 62 				new THREE.UV( ( ix + 1 ) / gridX, 1 - ( iz + 1 ) / gridZ ),
 63 				new THREE.UV( ( ix + 1 ) / gridX, 1 - iz / gridZ )
 64 			] );
 65 
 66 		}
 67 
 68 	}
 69 
 70 	this.computeCentroids();
 71 
 72 };
 73 
 74 THREE.PlaneGeometry.prototype = Object.create( THREE.Geometry.prototype );
 75 

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