[vtkusers] Memory leak in VTK-Python module

[P.J.Schaafsma]

(Added for the benefit of other people googling "vtk python memory leaks")

The output data object of a VTK filter is owned by the filter. So if you use
the output of a filter, as obtained through GetOutput(), the VTK filter
INCLUDING ITS INPUTS(!!!), will not be garbage collected. So, if you do
something like

gaussian = vtk.vtkGaussianSmooth()
gaussian.SetInput(data_object)
gaussian.Update()

data_object = gaussian.GetOutput()

there will be 2 data objects in memory, instead of 1, as the original
data_object still exists as the input to the filter. What you need to do is
this:

gaussian = vtk.vtkGaussianSmooth()
gaussian.SetInput(data_object)
gaussian.Update()

data_object.DeepCopy(gaussian.GetOutput())

This will cause the filter and its input to be garbage collected as there
are no extra references to the filter's output object, and therefore to the
filter itself.

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