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The sample code undoes the mirrorings/flips defined by the user relative to the wall. Rotating a wall 180° is not the same as mirroring a wall on an axis parallel to it. In the “On Screen View Options” toolbar turn on “Wall & Beam Refernce Lines” to see the difference in wall direction.
So the inside/outside of a composite wall is not defined by the order of the layers, it can be changed by the user. There is also a menu command at Edit / Reference Line and Plane / Invert Wall Direction.
Library Platform, Software Engineer