Texture coordinates in Rhino WIP: I do not see with Rhino Common API how to access UVs for multiple channels. I only see Rhino.Geometry.Mesh.TextureCoordinates which returns UVs for a single channel (the first one?). Am I missing something?
Through the changequeue you can query Rhino.Render.ChangeQueue.Mesh.Mapping. This is a rather new piece of API, @andy can give you better details on how to use the mapping channels.