    popSurface = vtkMarchingContourFilter()
    popSurface.SetInputConnection(popSplatter.GetOutputPort())
    popSurface.SetValue(0, 0.01)
    popMapper = vtkPolyDataMapper()
    popMapper.SetInputConnection(popSurface.GetOutputPort())
    popMapper.ScalarVisibilityOff()
--
    lateSurface = vtkMarchingContourFilter()
    lateSurface.SetInputConnection(lateSplatter.GetOutputPort())
    lateSurface.SetValue(0, 0.01)
    lateMapper = vtkPolyDataMapper()
    lateMapper.SetInputConnection(lateSurface.GetOutputPort())
    lateMapper.ScalarVisibilityOff()
