Reference Cinema 4D Cinema 4D Visualize, Broadcast, Studio IGES Source Program Export Settings
Function available in CINEMA 4D Visualize, Studio

Autodesk Inventor

Autodesk Inventor is an Autocad add-on application and offers an IGES export.

Inventor‘s IGES export

The save options should be set as shown above. Autodesk Inventor does not save any parametric spatial curves for trimmed surfaces.

Use Rhinoceros to later create parametric spatial curves.