I import all kinds of IGS and STPS and I have certainly bumbed into parts that "work" and parts that don't :?
Define "work or not work"?
:arrow: Sectioning
:arrow: Scketch and extrude (boss or cut) on the part
:arrow: Use features of the imported part to constrain other parts in an assembly (align, mate, etc)
:arrow: Remove faces
What is the cause of imported parts "working" or not ? I don't know.
I've noticed that when an IGS file does not import right (transparent faces), it helps to use the "stand alone faces" option when importing.
A lot of parts work when imported, but in the cases in which they don't and I really need a them to "work", I usually ask for the native and subcontract a "translation to Alibre editable solid". What the guy does is black magic to my eyes.