I tried to weld all vertex between that separates both rooms, meet in the corners, créate manually the Unwrap instead of aplying the 1x1x1 UVMap, etc. The mesh, looking from above, is like this
I tried to weld all vertex between that separates both rooms, meet in the corners, créate manually the Unwrap instead of aplying the 1x1x1 UVMap, etc. The mesh, looking from above, is like this