Flipping normals in cinema 4D. It's easy. But when I had a 3D game object which was viewed from the ouside but was invisible to the renderer because the normals weren't on the correct side, do you think I could find a quick explanation? So if you are looking to find out how to flip normals in Cineam 4D I hope this helps:
This pic show how you can flip the normals in Cinema 4D is easy,... once you know how.
from Andrew Brett Watson.com