is it possible to assign userdata to faces inside Blender and query it via the Python API - i haven’t found anything in the API docs yet.
The engine i am exporting to offers an effects framework, so i’d like to add some data to each face(group) and export that information. For example effect id/name, and some (special) properties for each effect (like specular exponent for specular lighting, or the filename of a normalmap).

Any ideas how to solve that?

Thank you very much.