    do2ds = vtkDataObjectToDataSetFilter()
    do2ds.SetInputConnection(reader.GetOutputPort())
    do2ds.SetDataSetTypeToPolyData()
    # format: component#, arrayname, arraycomp, minArrayId, maxArrayId, normalize
    do2ds.DefaultNormalizeOn()
    do2ds.SetPointComponent(0, xAxis, 0)
