[Paraview] CoProcessing needed fields

[Andy Bauer]

Hi Tim,

This should get set in the RequestDataDescription method in the generated
Python script. When I first did it I thought we'd easily be able to figure
out which fields were needed in order to update all of the required
pipelines and/or views. Unfortunately this isn't trivial in VTK so
basically what happens is that if a writer or view should output it
specifies that all fields should be made available. This is the
"datadescription.GetInputDescription(i).AllFieldsOn()" part of the
generated python script.

Answering your final question, this is something that is done automatically
in the generated script.

Andy

On Wed, Nov 7, 2012 at 2:57 PM, Tim Gallagher <tim.gallagher at gatech.edu>wrote:

> Hi,
>
> I see in the example code for
> ParaView/CoProcessing/Adaptors/FortranAdaptors/PhastaAdaptor/PhastaAdaptor.cxx
> calls like:
>
>   vtkCPInputDataDescription* idd =
>
> ParaViewCoProcessing::GetCoProcessorData()->GetInputDescriptionByName("input");
>
>   ...
>
>   if(idd->IsFieldNeeded("velocity"))
>   {
>   ...
>
> The only way IsFieldNeeded returns true is if that name field was added
> with AddCellField or AddPointField.
>
> Where does that happen? My intuition says that the python or C++
> processing script (generated by exporting state) would have those calls in
> it for the datasets that are actually used. In other words, if I set up my
> view in the GUI and I load my data and put a Slice through it and color by
> "Velocity", I expected the script from Export State to contain a call to
> AddCellField("Velocity"). At the very least I expected to see calls to add
> the fields I chose to load when I loaded my sample file to set up the view.
>
> So is that something that I need to put in the script on my own after it's
> exported or did I miss something? If I have to put it there myself, is
> RequestDataDescription the correct place to put that?
>
> Thanks,
>
> Tim
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