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

Dorier, Matthieu Thu, 03 Sep 2015 09:15:52 -0700

Hi,

Following your advice I installed the version of Catalyst that includes Python 
and started trying the examples 
(https://github.com/Kitware/ParaViewCatalystExampleCode)
I tried the CxxMappedDataArrayExample and the CxxImageDataExample; in both 
cases I get an error from the script:


Traceback (most recent call last):
  File "<string>", line 2, in <module>
  File "feslicescript.py", line 78, in DoCoProcessing

  File 
"/home/mdorier/Catalyst-build/lib/site-packages/paraview/coprocessing.py", line 
104, in UpdateProducers
    self.CreatePipeline(datadescription)
  File "feslicescript.py", line 34, in CreatePipeline

  File "feslicescript.py", line 17, in _CreatePipeline
    filename_3_pvtu = coprocessor.CreateProducer( datadescription, "input" )
  File "feslicescript.py", line 20, in Pipeline
    Slice1.SliceType.Offset = 0.0
  File "/home/mdorier/Catalyst-build/lib/site-packages/paraview/simple.py", 
line 1481, in CreateObject
    elif active_objects.source:
  File "/home/mdorier/Catalyst-build/lib/site-packages/paraview/simple.py", 
line 1690, in get_source
    self.__get_selection_model("ActiveSources").GetCurrentProxy())
  File "/home/mdorier/Catalyst-build/lib/site-packages/paraview/simple.py", 
line 1684, in __convert_proxy
    servermanager._getPyProxy(px.GetSourceProxy()),
AttributeError: GetSourceProxy

Any idea what is happening? Are the scripts outdated?

Thanks,

Matthieu

________________________________
From: Berk Geveci [berk.gev...@kitware.com]
Sent: Wednesday, September 02, 2015 4:23 PM
To: Andy Bauer
Cc: Dorier, Matthieu; paraview@paraview.org
Subject: Re: [Paraview] Isosurface and slicing with Catalyst in C++

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.ba...@kitware.com<mailto:andy.ba...@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 
<mdor...@anl.gov<mailto:mdor...@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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Powered by www.kitware.com<http://www.kitware.com>

Visit other Kitware open-source projects at 
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Please keep messages on-topic and check the ParaView Wiki at: 
http://paraview.org/Wiki/ParaView

Search the list archives at: http://markmail.org/search/?q=ParaView

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Powered by www.kitware.com

Visit other Kitware open-source projects at 
http://www.kitware.com/opensource/opensource.html

Please keep messages on-topic and check the ParaView Wiki at: 
http://paraview.org/Wiki/ParaView

Search the list archives at: http://markmail.org/search/?q=ParaView

Follow this link to subscribe/unsubscribe:
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Re: [Paraview] Isosurface and slicing with Catalyst in C++

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