14 std::tuple<RowVectors6l, RowVectors4l, RowVectors4l, VectorXl, VectorXl, VectorXl>
std::tuple< RowVectors6l, RowVectors4l, RowVectors4l, VectorXl, VectorXl, VectorXl > tetmesh_topology_initialization(Eigen::Ref< const RowVectors4l > T)
Given the mesh connectivity in matrix format, finds unique edges and faces and their relations.