[Paraview] custom filter doesn't update property in the Paraview UI

[corinna reuter]

Cory, thanks for mentioning the TIFFReader proxy. I tried to modify my
previously attached code such that the NPoints property links to a
NPointsInfo property. Plus, I have removed the call
"this->SetNPoints(nset);" inside vtkTestProperty::RequestData as suggested
by Utkarsh. The NPoints property is still showing the default "42", though,
and not initialized or updated from the number of points of the input
dataset. I am obviously missing another important step in addition to
changing the xml definitions, but which one?

Here is the detailed modification of TestProperty.xml compared to the
earlier attachment:
replace
"<IntVectorProperty name="NPoints"
                        command="SetNPoints"
                        number_of_elements="1"
                        default_values="42">
  </IntVectorProperty>"
with:
"<IntVectorProperty name="NPoints"
                        command="SetNPoints"
                        information_property="NPointsInfo"
                        number_of_elements="1"
                        default_values="42">
  </IntVectorProperty>
  <IntVectorProperty name="NPointsInfo"
                        command="GetNPoints"
                        information_only="1">
    <SimpleIntInformationHelper />
  </IntVectorProperty>"

Thank you
Corinna


On Thu, Jul 14, 2016 at 5:24 PM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> Corinna,
>
> Take a look at the TIFFReader SourceProxy in
> ParaViewCore/ServerManager/SMApplication/Resources/readers.xml. It has
> a CustomDataSpacing property that enables you to set voxel spacing,
> and has an associated information property CustomDataSpacingInfo that
> should initially populate the spacing property when the reader is
> created.
>
> HTH,
> Cory
>
> On Thu, Jul 14, 2016 at 11:17 AM, Utkarsh Ayachit
> <utkarsh.ayachit at kitware.com> wrote:
> >> I'll check the meaning of MTime.
> >
> > See the implementation of vtkSetMacro() in vtkSetGet.h. Every time the
> > value changes, it call this->Modified() which updates the MTime. Since
> > VTK is a demand-driven pipeline, changes to MTime is what tells the
> > pipeline that the algorithm has been modified and needs reexecution.
> > If one modifies the MTime in RequestData() (the method called by the
> > pipeline to process the input to produce output), the pipeline thinks
> > the filter is always dirty and that can cause unexpected side effects.
> >
> >
> >> I'd need something similar to an image resize filter. The output size
> should
> >> be identical to the input size, when the filter is first attached to the
> >> input. The output size should be shown in the UI and the user should be
> able
> >> to enter a different output size.
> >
> > This is possible. Let me see if I can find you a simple example for
> > the same. I'll get back to you.
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>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
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