I have a high res and polypainted model in Zbrush.
I duplicate it, take off the higher subdivisions, UV master, then reproject the original mesh on it.
But then when trying to generate a diff map, the UVs are all over the place, big black patches everywhere.
Same if I try to use a polypaint done directly on the apparently UVd model.
I think I always done this workflow, and never had any problems before, really confused.. what am I missing?