Method extract_faces

tests/tools/MeshUtils/SubdivisionTest.h:35–41

        }

        MatrixIr extract_faces(MeshPtr mesh) {
            const size_t num_faces = mesh->get_num_faces();
            const size_t num_vertex_per_face = mesh->get_vertex_per_face();
            VectorI flattened_faces = mesh->get_faces();
            Eigen::Map<MatrixIr> faces(flattened_faces.data(), num_faces, num_vertex_per_face);
            return faces;
        }

        void assert_equal_centroid(const MatrixFr& pts1, const MatrixFr& pts2) {
            const size_t dim = pts1.cols();