[Paraview] Isosurface and slicing with Catalyst in C++

[Berk Geveci]

One thing I want to clarify with respect to what Andy said. Figuring out
parallel rendering in VTK is tricky but from ParaView be it C++ or Python,
it is much easier. We are here to provide help.

Having said this, if you think that you will be changing your in situ
functionality regularly, I would also highly recommend the Python route. If
you are planning to build in a relatively fix in situ capability, C++ is a
decent option. I would still recommend getting there through the Python
route.  Once you have everything figured out, we can help convert things to
C++.

Best,
-berk

On Wed, Sep 2, 2015 at 12:01 PM, Andy Bauer <andy.bauer at kitware.com> wrote:

> Hi Matthieu,
>
> I would strongly recommend that you use a ParaView GUI generated Python
> Catalyst pipeline script instead of hand-written C++ Catalyst pipeliine to
> do what you want. There are a surprising amount of settings required to
> output images from VTK. If you want to do that in parallel the complexity
> goes up even more due to parallel compositing of the images. Everyone that
> I've run across that wanted to avoid Python with their Catalyst
> instrumented code quickly changed their mind after trying out the Python
> generated scripts. The overhead of using Python really is negligible
> compared to a pure C++ description of the Catalyst pipeline. Also, the
> Catalyst Live and Cinema output are all driven by Python code as well.
>
> The last and only time I tried doing rendering in parallel in VTK it took
> me about 5 days and that was with constantly asking questions from other
> people here at Kitware that knew how to do that.
>
> That being said, if after reading this you're still set on doing all of
> this in C++ then let us know and we'll see what can be done.
>
> Regards,
> Andy
>
>
> On Wed, Sep 2, 2015 at 2:38 PM, Dorier, Matthieu <mdorier at anl.gov> wrote:
>
>> Hi,
>>
>> I'm diving into Catalyst and try to build a pipeline in C++ for an simple
>> example code. My use case is the following:
>> I have a uniform 3D grid (converted into vtkImageData) on which I map a
>> field of double values (wrapped into a vtkDoubleArray).
>> By looking at the examples I managed to make the adaptor that creates the
>> grid and maps the field on it. Now I would like to build pipelines for 2
>> scenarios:
>> - slicing the grid horizontally at a given level, apply a color map, and
>> output the result in a PNG file;
>> - building an isosurface from the 3d grid (with configurable isovalue)
>> and print the result in a PNG file.
>> In both cases I don't know which classes to look at in the Doxygen of
>> VTK. Besides, I suppose for the second case there should be some concept of
>> camera position and parameters...
>>
>> Any hint or examples would be appreciated.
>> Thanks,
>>
>> Matthieu Dorier
>>
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