Just wanted to say a massive thank first for how useful this post is to most of C4D users. I have spent days and days on the interwebs to find this specific piece of information, especially when working with multiple textures over an asset.
My two cents regarding smoothing group : The only solution I have found is to download the “Riptide pro” plugin, export as obj and then import it in UE4. This solution costs 50 bucks however (but the 30-days trial helped). The obj to fbx from autodesk doesn’t help either.
I have brought the issue to Maxon countless times, hope that they will acknowledge the problem in the near future and fix these “phong tag” not translating properly into FBX smoothing group export. Or that a gentle soul will make a free plugin for that, I don’t have the coder perk.
All in all, thanks again.