TopoDS_Shape v1 = TopExp::FirstVertex( edge, true ); // always FORWARD
TopoDS_Shape v2 = TopExp::LastVertex( edge, true ); // always REVERSED
// to make adjacent edges share key-point, we make v2 FORWARD too
TopoDS_Shape v1 = TopExp::FirstVertex( edge, true ); // always FORWARD
TopoDS_Shape v2 = TopExp::LastVertex( edge, true ); // always REVERSED
// to make adjacent edges share key-point, we make v2 FORWARD too