code: def outline_corners(dataset, factor=0.2):
          
          alg = vtk.vtkOutlineCornerFilter()
          alg.SetInputDataObject(dataset)
          alg.SetCornerFactor(factor)
          alg.Update()
          return wrap(alg.GetOutputDataObject(0))
docs: Produces an outline of the corners for the input dataset.
  
          Parameters
          ----------
          factor : float, optional
              controls the relative size of the corners to the length of the
              corresponding bounds