[vtkusers] Update VTK Poly data in vtkRenderWindow

[Gishara Indeewarie]

Hi all,

I have a vtk poly data rendered in an vtk render window. I want to update
the data in the window every time I select an option.
I did this by deleting the interactor window every time I update data.
Is there any other sophisticated method to achieve this?

Thanks.
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