Source Program Export Settings
The IGES format lets you save files using many different methods, hence the export settings in the source application play an important role. Current CAD applications offer a wide variety of options for exporting IGES files. It‘s advisable to export curves as Rational B-Spline Curve (Nr. 126), surfaces as Rational B-Spline Surface (Nr. 128) and trims surfaces as Trimmed Surface (Nr. 144). This ensures optimal support upon import. In the following, settings for some widely-used CAD applications will be explained.