text: /**
   * @author mr.doob / http://mrdoob.com/
   * based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Plane.as
   */
  
  THREE.PlaneGeometry2 = function ( width, height, segmentsWidth, segmentsHeight ) {
  
  	THREE.Geometry.call( this );
  
  	var ix, iy,
  	width_half = width / 2,
  	height_half = height / 2,
  	gridX = segmentsWidth || 1,
  	gridY = segmentsHeight || 1,
  	gridX1 = gridX + 1,
  	gridY1 = gridY + 1,
  	segment_width = width / gridX,
  	segment_height = height / gridY,
  	normal = new THREE.Vector3( 0, 0, 1 );
  
  	for ( iy = 0; iy < gridY1; iy++ ) {
  
  		for ( ix = 0; ix < gridX1; ix++ ) {
  
  			var x = ix * segment_width - width_half;
  			var y = iy * segment_height - height_half;
  
  			this.vertices.push(new THREE.Vector3( x, - y, 0 ));
  
  		}
  
  	}
  
  	for ( iy = 0; iy < gridY; iy++ ) {
  
  		for ( ix = 0; ix < gridX; ix++ ) {
  
  			var a = ix + gridX1 * iy;
  			var b = ix + gridX1 * ( iy + 1 );
  			var c = ( ix + 1 ) + gridX1 * ( iy + 1 );
  			var d = ( ix + 1 ) + gridX1 * iy;
  
  			var face = new THREE.Face4( a, b, c, d );
  			face.normal.copy( normal );
  			face.vertexNormals.push( normal.clone(), normal.clone(), normal.clone(), normal.clone() );
  
  			this.faces.push( face );
  			this.faceVertexUvs[ 0 ].push( [
  						new THREE.UV( ix / gridX, iy / gridY ),
  						new THREE.UV( ix / gridX, ( iy + 1 ) / gridY ),
  						new THREE.UV( ( ix + 1 ) / gridX, ( iy + 1 ) / gridY ),
  						new THREE.UV( ( ix + 1 ) / gridX, iy / gridY )
  					] );
  
  		}
  
  	}
  
  	this.computeCentroids();
  
  };
  
  THREE.PlaneGeometry2.prototype = new THREE.Geometry();
  THREE.PlaneGeometry2.prototype.constructor = THREE.PlaneGeometry;
  