I've used the Labs Map Baker node previously to transfer my textures from one uv'd mesh to another with different uvs. That node has been crashing on me lately, so I've been trying to figure out a way to do it in COPS. I've followed a tutorial series by a gentleman named Bryan Bently It works fine when you have a single mesh section but once you introduce more things start to get a little funky. I've attached some screenshots of my node tree. I had a previous setup that used the "Attribute From Map" node but sadly that node does a premultiply operation on the alpha causing data loss in some packed textures. It also requires really dense geometry in order to get good resolution in the output textures.