[Paraview] python programmable filters with no output in ParaView?

[Pierre JUILLARD]

Thank you for your comments.

Yes a cvs table is an interesting idea to store the results. I'm gonna check
that. Thanks for the track!

At first, I was thinking to another way to keep such kind of scalar results
computed by a given filter.
I indeed thought that it could be interesting to store them as an attribute
value in the .pvsm file of the ParaView session, something like:

    <Proxy group="filters" type="" id=""
servers="">                                         *<= the filter that
computes a scalar result...*
      <Property name="Input" id=""
number_of_elements="">                            *<= ...and the definition
of all its inputs, and other necessary data*
        ...
      </Property>
        ...
      <Property name="Output" id="" umber_of_elements="1" *value="46"*>
* <= ...finally, the results obtained and written in the pvsm after a batch
execution or when the ParaView session is saved.*
        ...
      </Property>
    </Proxy>


But it may not be well in accordance with the logic of the pvsm file.

Thanks again for your help!
Cheers,



Pierre



2009/1/24 Berk Geveci <berk.geveci at kitware.com>

> Actually, I think that such a filter should have an output. Probably a
> vtkTable that has one or a few values in it. You can then save that
> table to a csv file or something. Even use it as an input to another
> filter. Applications like OpenDX, SCIRun and AVS take this idea to the
> extreme and make pretty much all parameters of pipeline modules into
> inputs...
>
> -berk
>
> On Sat, Jan 24, 2009 at 9:23 AM, David E DeMarle
> <dave.demarle at kitware.com> wrote:
> > Hmm,
> >
> > One thing to try is to have it output a vtkPolyData with exactly one
> > point and VTK_VERTEX cell (to contain the point and cell associated
> > attribute arrays respectively. The output is minimal in that case, but
> > can be used by vtk/paraview for additional processing if needed (for
> > example the information tab will display something useful). That is
> > what the paraview.servermanager.Fetch filter does for client side
> > python scripting of reduction operations.
> >
> > But no output? We would have to change the cxx code for that. Please
> > add a feature request to the bug tracker if the above solution does
> > not work for your needs.
> >
> > cheers,
> >
> > On Fri, Jan 23, 2009 at 8:42 PM, Pierre JUILLARD
> > <pierre.juillard at gmail.com> wrote:
> >> Hi all,
> >>
> >> I would like to know if there is a way to have a python programmable
> flter
> >> without output in ParaView, that is to say, having an additional entry
> >> "none" when the "Output DataSet Type is requested in the ParaView python
> >> programmable filter GUI?
> >> For instance, is it possible to have a python programmable filter
> computing
> >> the whole volume of a 3D mesh (making use of vtkMassProperties for
> instance)
> >> which would thus returns a single scalar.
> >> Such a result could then be displayed or saved in a result file, but not
> new
> >> vtk data or grid would be generated...
> >>
> >> I thank you in advance for your comments.
> >> Cheers,
> >>
> >>
> >> Pierre
> >>
> >>
> >> _______________________________________________
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> >> ParaView at paraview.org
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> >>
> >>
> >
> >
> >
> > --
> > David E DeMarle
> > Kitware, Inc.
> > R&D Engineer
> > 28 Corporate Drive
> > Clifton Park, NY 12065-8662
> > Phone: 518-371-3971 x109
> > _______________________________________________
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> > http://www.paraview.org/mailman/listinfo/paraview
> >
>
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