[vtkusers] How to detect change/update of input inside algorithm?

[Jana Sefcikova]

Hi all,
how can be detected change or update of input vtkPolyData inside
vtkPolyDataAlgorithm ?
In RequestData storing the pointer and comparing it with incoming pointer ?
(but what if pointer stays but input changed its properties or topologies
 or s.t else)

Jana
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