 			return stream;
 		}
 	}
-}+}

					+ "is not set to StreamUsage.WRITE."
				);
			}
		}

		public static function concat(streams : Vector.<IVertexStream>, usage : uint) : VertexStream

		{
			if (!_invalidMinMax)
				return ;
				
			_invalidMinMax = false;
			
			var size		: uint	= format.dwordsPerVertex;
