Hi
we are an archviz company and software devs too,
have a plugin "spline uv mapper" which makes and deforms an UV along a c4d spline, the result is a normal c4d UV that can be rendered anywhere in any angine.
we use it for archs, furniture, curved walls, folded arch elements, etc
we also have a plugin to import rhino 3dm files directly (just use open command), keeping layers,also hierarchical, groups, blocks, materials/mapping (basic mats),cameras and so on
you find all and more( inlcuding other cool archviz related ptools) here at our page
www.3dtools.infobest greetings
stefan