Ngons are just whats seen in the viewport. Underneath there is triangulation of course.
There are a couple of options but a boole have to create triangles of course.

See image.. Left is the web_cam in the viewport, on the right is the wire render... C4D can't render only the quads with out a trick. It always will render the hidden Ngons lines.




As said with a work around it can be done in C4D, I won't try to explain it because this is Moi3D forum and not C4D.. If there are user with C4D who want to know how this can be done, please visit me on my forum.




Peace,
Rich_Art. ;-)