[vtkusers] writing a filter with vtkPolyDataAlgorithm

[Ahmet Doğan]

hi,

I can write filter with _*vtkPolyDataAlgorithm*__**__*. *_it checks 
input and if it is changed it call  RequestData().
But what if I have another values that must be checked it it is changed 
or not then if it changed refresh output.
how can I implement checking for my own values

Kind Regards.

Ahmet Doğan
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