Hi David,
You're very welcome, and thanks for the reply.
A lot of information about Polygons are here:
https://help.maxon.net/c4d/2025/en-us/Default.htm#html/DMODELING-MESH_CHECK.html#MESH_CHECK_POLY
Call up a Polygon Object, set one side to 0cm, press "c", and check it. That is a bad polygon π , often they are just produced with no influence to the visual results. IF so, you can select those with the Mesh Checker, and delete them.
Since there is typically no scene information on how they should be done correctly, repairing is a artist decision, not based on rules (DTDT, do-this-do-that).
I hope that helps a little.
Enjoy your weekend