[Paraview] Interfacing with FE simulation using Catalyst

[Dan Lipsa]

Hi Alexandre,
The following blog post describes how to pause the simulation and how to
manipulate data in Catalyst Live.

http://www.kitware.com/blog/home/post/722

Could you try the scripts attached in the blog post? Do those work?
Thanks,
Dan


On Fri, Nov 21, 2014 at 8:30 AM, Alexandre Ancel <alexandre.ancel at cemosis.fr
> wrote:

> Hello,
>
> I am trying to use catalyst in our Finite Element framework, but I can't
> get it to work right now. For background information, I would like to
> inferface a parallel simulation, running with MPI, with paraview to display
> the results, thus do live visualization.
>
> I compiled Paraview from the 4.2 sources (from the website) to ensure that
> our library compiles with the same library as the ParaView I'm launching.
>
> The problem I have is similar to the one reported in:
> http://public.kitware.com/pipermail/paraview/2013-June/028497.html
>
>
> In our application, we have an exporter interface that allows to write VTK
> data (vtkUnstructuredGrid) with field data (scalar, vectorial). I built the
> catalyst interoperation on top of it, by using the Cxx example provided in:
>
> https://github.com/Kitware/ParaViewCatalystExampleCode/tree/master/CxxFullExample
> <https://github.com/Kitware/ParaViewCatalystExampleCode>
> I'm am using a modified version of the feslicescript.py
> <https://github.com/Kitware/ParaViewCatalystExampleCode/blob/master/CxxFullExample/SampleScripts/feslicescript.py>
> that should enable live visualization IMHO (enclosed with this email).
>
> The excerpt of C++ code running the coprocessing is the following one:
> ----
> vtkSmartPointer<vtkCPDataDescription> dataDescription =
> vtkSmartPointer<vtkCPDataDescription>::New();
> dataDescription->AddInput("input");
>
> if(inSituProcessor->RequestDataDescription(dataDescription.GetPointer())
> != 0)
> {
>   dataDescription->GetInputDescriptionByName("input")->SetGrid(out);
>   dataDescription->SetForceOutput(true);
>   std::cout << "CoProcess " <<
> inSituProcessor->CoProcess(dataDescription.GetPointer())<< std::endl;
> }
> ----
> where out is the unstructured grid data.
>
> I then launch Paraview and allow connection for catalyst via the menu.
> Eventually I launch our simulation that interfaces with Catalyst.
>
> I then get the following error in Paraview:
> ERROR: In
> /home/ancel/Downloads/ParaView-v4.2.0-source/VTK/Parallel/Core/vtkSocketCommunicator.cxx,
> line 812
> vtkSocketCommunicator (0x2b1f940): Could not receive tag. 1
>
> And the coprocessing stops in Paraview, altough I can see the catalyst
> server in the Pipeline browser and a PVTrivialProducer1 appearing in the
> background, but no data appear in the visualization window of Paraview.
>
> I tried instrumenting the code in Paraview to locate where the problem
> would be, but it appears that the problem happens outside of the
> vtkLiveInsituLink class, which (correct me If I'm wrong) should handle the
> link between the application and Paraview.
>
> The different questions that I have would be summed up as:
> - Can you give me some pointer as to where the problem might be located ?
> Coding mistake on my side ? Did I miss something in the issue I referred to
> before ?
> - Is it possible to pause the simulation while the user manipulates data
> in Paraview ? How ?
>
> Sorry for the long mail, but I tried to be as precise as I could be,
> Thanks in advance for the help and your time,
>
> Best regards,
> Alexandre Ancel
>
> --
> Alexandre Ancel
> Docteur, Ingénieur de recherche / Phd, Research Engineer
> Cemosis <http://www.cemosis.fr> - alexandre.ancel at cemosis.fr
> Tel: +33 (0)3 68 8*5 02 06*
> IRMA - 7, rue René Descartes
> 67 000 Strasbourg, France
>
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