yep the simplest way to import and export from C4D while preserving point order grouping and material grouping is with riptide. you would shudder to hear the way we used to have to do it before spanki developed riptide (involving uv mapper or the truely agonizing process of using poser's own grouping tool) C4D's native import export does not preserve point order and only allows one to export one type of grouping and splits seams on that grouping.