I want to select "Face Islands" on the main mesh. I know that each of them must have the same geometry. But I want to do only one UV unwrapping for each one. I think that I will have to individually select faces, then unwrap, then adjust the UV for each selection, which very tedious.
The three windows on the top floor have been individually selected, UV-unwrapped, and material-assigned.
The six windows on the lower floors have the exact same geometry. I was hoping that I could select all of them and UV-unwrap for each disjoint selection. The normal behavior for this is it will put all 6 windows in the same UV map.