[Paraview] Catalyst: dump everything in C++

[Andy Bauer]

Hi Matthieu,

You can indeed use Catalyst without Python. There are two examples in the
Examples/Catalyst subdirectory of the source tree to do that. They are
CxxVTKPipelineExample and CxxPVSMPipelineExample. I wouldn't recommend this
method as the Python route is much simpler. Several people have thought
about avoiding the Python interface and generally come around to its
flexibility (both ease in creating new Catalyst output as well as making
changes without having to recompile code).

In my opinion, if you're not doing image output the C++ route is manageable
without too much difficulty. For image output there's a lot of things which
need to be set in order to get all the lookup tables, data ranges, camera
angle, etc. that can get quite complex. If you look at a GUI generated
Catalyst script for data extract output and compare it to image output
you'll easily see the difference in the complexity. Also, Cinema output is
Python driven so that wouldn't be available through a C++ pipeline.

Now that I've gone through all of this, is there a specific reason why
you're looking to avoid Python?

Best,
Andy

On Wed, Sep 21, 2016 at 9:27 AM, Dorier, Matthieu <mdorier at anl.gov> wrote:

> Hi,
>
> In general the way we create python scripts for a Catalyst-enabled
> simulation is by first running the simulation with a Python script that
> writes the data into files, then do offline analysis on those files and
> export a python script representing the analysis tasks to be done in situ.
>
> I was wondering if, instead of using a Python script for writing all the
> data into file, an equivalent C++ code was available, and how such a code
> would be integrated into a Catalyst-enabled simulation? Or maybe just with
> VTK once the adaptors are written for the simulation's data?
>
> Thanks,
>
> Matthieu
>
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