How to get the center of the curved wall?
GDL Reference Guide only show the WALL_DIRECTION & WALL_POSITION.
GDL Reference Guide:
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WALL_DIRECTION direction of the wall
straight walls: the direction of the reference line, curved walls: the direction of the chord of the arc
WALL_POSITION absolute coordinates of the wall
array with 3 columns: x, y, z, which means the position of the wall’s starting point relative to the project origin
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