* \param S - face surface geometry
* \param c2d - 4 pcurves in the order as returned by GetFaceEdgesIDs(faceID)
* \param isForward - orientation of pcurves comparing with block edge direction
* \param S - face surface geometry
* \param c2d - 4 pcurves in the order as returned by GetFaceEdgesIDs(faceID)
* \param isForward - orientation of pcurves comparing with block edge direction