[Paraview] EXTERNAL: Re: CxxOverlappingAMRExample with Catalyst Live

[Andy Bauer]

Hi Jim,

Yes, you can have a Catalyst instrumented code connect to something running
pvserver and have the pvserver connect to the client. At the end of the
Python generated scripts there should be a line that looks like:
    coprocessor.DoLiveVisualization(datadescription, "localhost", 22222)

Here you just have to edit it to point to something other than localhost.

As for overlapping structured grids, there's no convenient
composite/multiblock data set for that like there is for Cartesian grids.
What you would need to do is use vtkStructuredGrids with blanking done
manually and then just add them in as blocks in a vtkMultiBlockDataSet. It
won't have the structure that the AMR specific composite data sets have so
it may be a bit slower for some filters but it should work pretty much like
you want for most stuff. Please let us know if you try this out and get
unexpected/undesired behaviour.

Best,
Andy

On Thu, Mar 31, 2016 at 12:05 PM, <Jim.Eliot at awe.co.uk> wrote:

> Hi Andy,
>
>
>
> Thanks for your reply. Currently I am looking at the small examples but I
> would like to be able to fetch larger geometries in future. Is it possible
> for the simulation to connect to a parallel pvserver which will send images
> back to the client?
>
>
>
> Putting interactive usage to one side for a moment, is non-uniform AMR
> supported in Catalyst batch? I.e. overlapping structured grids . I couldn’t
> find any references to non-uniform AMR in ParaView while researching.
>
>
>
> Kind regards,
>
> Jim
>
>
>
> *From:* Andy Bauer [mailto:andy.bauer at kitware.com]
> *Sent:* 31 March 2016 16:08
> *To:* Eliot Jim AWE <Jim.Eliot at awe1.awe.co.uk>
> *Cc:* paraview at paraview.org
> *Subject:* EXTERNAL: Re: [Paraview] CxxOverlappingAMRExample with
> Catalyst Live
>
>
>
> Hi Jim,
>
> Yes, currently Overlapping AMR data sets are not supported by Catalyst
> Live. This is because VTK doesn't support sending that data object. That
> would have to be changed in vtkCommunicator::Send(vtkDataObject* data, int
> remoteHandle, int tag).
>
> A workaround would be to use a Threshold filter to convert to a multiblock
> of unstructured grids, use the merge blocks filter and then extract this
> output to the client. You'll get some warnings about the data set not being
> a polydata (think about running a large simulation and trying to transfer
> all of that to a separate server or client). I'm assuming since you're
> trying to fetch the entire data set that the use case isn't for an overly
> large data set.
>
> Cheers,
>
> Andy
>
>
>
> On Thu, Mar 31, 2016 at 9:44 AM, <Jim.Eliot at awe.co.uk> wrote:
>
>
>
> Good afternoon,
>
>
>
> I have been trying to use Catalyst Live with the CxxOverlappingAMRExample
> from the ParaView Catalyst Example Code repository [1] but I see an error
> when I try to visualise the data from a ParaView client. The client
> connects to the simulation successfully and PVTrivialProducer1 appears in
> the Pipeline Browser. The Information tab shows it as an Overlapping AMR
> Dataset with 3 levels. However, when I click on the PVTrivialProducer1
> icon, ParaView prints an error then segfaults. The error is something like:
>
>
>
>     Warning: In <src-dir>/VTK/Parallel/Core/vtkCommunicator.cxx, line 394
>
>     vtkSocketCommunicator (…): Cannot receive vtkOverlappingAMR
>
>
>
> I have tried this with both ParaView 4.4.0 and 5.0.0 with the same
> results. The example works fine when I am using non-Live Catalyst (i.e. it
> writes out a bunch of vtm files that I can read into ParaView).
>
>
>
> So I am wondering, are AMR meshes not supported by Catalyst Live? Do I
> have to handle AMR meshes differently when using Catalyst interactively?
>
>
>
> Many thanks,
>
> Jim
>
>
>
> [1] https://github.com/Kitware/ParaViewCatalystExampleCode
>
>
>
> *Jim Eliot*
>
> *High Performance Computing Group*
>
> AWE, Aldermaston, Reading, RG7 4PR
>
>
>
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