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PolyCAD
Reverses the order of the points on the curve, i.e, first point becomes the last point and vice versa. This is useful in when constraining a X-Topology curve to a location surface as in the case of the plane constraint the first point of the curve marks the planes location. In addition, the point may be reference to a certain location on another curve. Reverse the points order if the other end of the X-Topology Curve has a better reference location.