There is a long curve in model and I project it onto a Face and hope it can trim the Face into several sub Faces. I find an member function
void Add (const TopoDS_Edge &E, const TopoDS_Face &F)
in class BRepFeat_SplitShape. But I am confused about the second parameter. Why we need this parameter and how should I pass the "F". And whether exists any simple method to trim Face by Curve(s).