Place some windows in walls set at different angles and then mirror a copy of those walls and windows.
Then query the values for WALL_DIRECTION, SYMB_ROTANGLE
You might also want to look at WIDO_REVEAL_SIDE to determine which way the window was place - reveal inside or outside.
It should always be outside but you may have a reason to place your window reveals on the inside of the wall?
Barry.
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