code: def _get_output(algorithm, iport=0, iconnection=0, oport=0, active_scalar=None,
                  active_scalar_field='point'):
      
      ido = algorithm.GetInputDataObject(iport, iconnection)
      data = wrap(algorithm.GetOutputDataObject(oport))
      data.copy_meta_from(ido)
      if active_scalar is not None:
          data.set_active_scalar(active_scalar, preference=active_scalar_field)
      return data
docs: A helper to get the algorithm's output and copy input's vtki meta info