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Nurbs surface reparametre or coordinate moving

SunHongLei's picture

Given a nurbs surface with the type of TopoDS_Shape, there is a point with the type of TopoDS_Vertex on the surface. When I move the point a distance ,meanly x move to x + dx and y move to y + dy,How can I get the coordinate of Z or How can I get the new coordinate of the point ?