Hi.
I have a model consisting of two meshes. For example a lamp. It has a copper base and a fabric shade. The base has an unwraping that takes up the entire Uv-shell, and the same for the lampshade: unwraping takes up a separate uv-shell. This is not UDIM. Just a model with two materials.
So, What should I choose mixed uv or non-overlapping uv or overlapping?
I would say select mixed UV’s, overlapping UV’s means some parts of the model share same texture space, for example multiple leaves of a tree can be stacked on top of the same leave texture on the texture map (overlapping).
You can also have some parts overlapping and some parts having own space on the map, in that case I would also select mixed.
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