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

[Jana Sefcikova]

Thank you very much for your response,
I will think about it.

On 23 July 2012 16:24, David E DeMarle <dave.demarle at kitware.com> wrote:

> You shouldn't have to. The vtkDemandDrivenPipeline executive makes
> sure that RequestData is _only_ called when the input changes or the
> parameters of the algorithm itself changes. See
> vtkDemandDrivenPipeline::NeedToExecuteData for how the various MTimes
> are calculated and used to do that.
>
> If the "input" is not a standard pipeline input (say a pointer to
> something that you manage rather than an upstream data object or
> algorithms output that you've called SetInputData/SetInputConnection
> to assign) then you can override the algorithm's GetMTime to take that
> object's mtime into account too when the algorithm is check in
> NeedToExecuteData. See vtkClipPolyData an example.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
> On Sat, Jul 21, 2012 at 8:39 PM, Jana Sefcikova <neollie at gmail.com> wrote:
> > 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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