Rikrok

Thanks for your answers. Multiple UVs for the same polys is standard practice in video games. Carlosa I'm trying to follow your workflow but I can't get it to work. The closest I got is a model with twice as many faces as it should have and still missing the second set of UVs. I get the feeling AbnRanger is right and 3D Coat simply doesn't support this. In the short time I've used 3D Coat I've been very impressed with its UVing so I kept at it and found a solution. I tried copying the new UVs onto the model with original UVs in Maya but unfortunately Maya's transfer attributes is broken to the point of being useless. Attribute transfer in Houdini however has done the trick perfectly.

Sorry but this doesn't help. That's a model having multiple UV sets- that's all well and good. I'm asking for the same part of a model having multiple UVs.

It seems like you can't have faces with multiple UV sets. For a game you need a set for the diffuse which will have lots of overlapping UVs, and a second set with no overlaps for a lightmap. As far as I can tell a particular piece of geometry can only belong to 1 UV set at a time, when I need it to be in multiple. Am I missing something or is this a feature missing in 3D Coat?