Thanks for creating the IGES Toolbox. I'm trying to use it to read a truck IGES model (58729_Cement_Truck_NURBS.iges downloaded from http://www.3dcadbrowser.com/download.aspx?3dmodel=58729) and there's something funny about both ends of the trunk when the model is displayed (see problem here https://dl.dropboxusercontent.com/u/78384338/truck.png). Looks like something wrong with trimming the sphere surfaces. Any ideas/suggestions?? The model displays OK in Rhino.