The quality of CAD models are highly varying depending on the originating CAD system and the maner in which the CAD system facilities is employed. The structuring of a model into surface patches is often defined more from the modeling history than the actual shape of the object. Furthermore, translation of the model from the proprietary format to a standard exchange format like STEP or IGES can produce errors in the model representation.
A number of standards for CAD qualities exist. The following is a subset of quality tests fetched from these standards:
Published November 17, 2009