def mesh_fast_copy(other):
subd = Mesh()
subd.vertex = deepcopy(other.vertex)
subd.face = deepcopy(other.face)
subd.facedata = deepcopy(other.facedata)
subd.halfedge = deepcopy(other.halfedge)
subd._max_face = other._max_face
subd._max_vertex = other._max_vertex
return subd
