How to get the Orientation of an edge with respect to a face

[ealwen]

I have a TopoDS_Face face, and a TopoDS_Edge edge,and the edge is the bound of face. I can get the geom_curve by the code geom_curve,Umin,Umax=BRep_Tool.Curve(edge) and I can get the local property such as the vector tangent by using the class GeomLProp_CurveTool We know the vector tangent to the curve depend on the Orientation. The trouble is that I don't know if the orientation of the curve satisfy the Right hand rule