If you specifically need the Instant Roof interface:
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def add_dormer(x, y, width, depth)
new_p = p + norm1 + norm2 expanded << new_p end expanded If you specifically need the Instant Roof interface:
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# Extrude downward for eave vec_down = Geom::Vector3d.new(0, 0, -thickness) p1_down = p1 + vec_down p2_down = p2 + vec_down