code: def submesh(self, faces_sequence, **kwargs):
          
          return util.submesh(mesh=self,
                              faces_sequence=faces_sequence,
                              **kwargs)
docs: Return a subset of the mesh.
  
          Parameters
          ----------
          faces_sequence : sequence (m,) int
            Face indices of mesh
          only_watertight : bool
            Only return submeshes which are watertight
          append : bool
            Return a single mesh which has the faces appended.
            if this flag is set, only_watertight is ignored
  
          Returns
          ---------
          if append : trimesh.Trimesh object
          else :      list of trimesh.Trimesh objects