And if you're exporting to Maxwell as a stand-alone program rather than inside of C4D, you would probably use OBJ format with "Export: Quads & Triangles" - some programs do not handle complex n-gons very well and can get confused with triangulating them. If you see things like triangles leaking outside of polygon boundaries that means the program is having difficulty processing n-gons and so in that case switch to outputting quads & triangles out from MoI so that you won't be giving that program complex n-gons to deal with. But C4D itself is pretty good at handling n-gons.

- Michael