gistfile1.cpp

    qeg.GenerateFromFaces(faces.size(), vertices.size(),
        [this](ind_t faceIdx, ind_t & a, ind_t & b, ind_t & c){
            auto & face = faces[faceIdx];
            a = face.vertices[0];
            b = face.vertices[1];
            c = face.vertices[2];
        }
    );