[Paraview] ParaView python vs VTK python api (UNCLASSIFIED)

Wed Aug 6 16:02:07 EDT 2014

Classification: UNCLASSIFIED
Caveats: NONE

Dave,

Thank you for the explanation. I have a better understand now on ParaView 
python and VTK python.

Thanks
-simon

-----Original Message-----
From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of David E 
DeMarle
Sent: Wednesday, August 06, 2014 3:51 PM
To: Sebastien Jourdain
Cc: paraview at paraview.org
Subject: Re: [Paraview] ParaView python vs VTK python api (UNCLASSIFIED)

Adding to what Andy and Seb said,

"ParaView can be viewed in some ways a wrapper around VTK filters" + that 
often exist on remote MPI parallel processes + "."

In Paraview client side scripts (tools->Python Shell or pvpython or pvbatch) 
you create python objects that create proxies that create remote vtk objects 
somewhere. Which is why it is not typically safe to mix vtk and paraview 
python code and do things like modifying the input data sets. See python trace 
and the paraview python wiki page to learn about this level of scripting.

Within the python programmable filter and source, you are running inside those 
remote processes. Here the API is pretty much standard python wrapped VTK. See 
the wiki page about python programmable filters for starters and standard vtk 
documentation to learn details about this secondary level of scripting.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Wed, Aug 6, 2014 at 3:45 PM, Sebastien Jourdain 
<sebastien.jourdain at kitware.com> wrote:

	Hi Simon,

	if the VTK work that you are targeting is not parallel, you can directly run 
a vtkpython script inside pvpython or pvbatch.
	Otherwise Andy is right, you can not mix parallel ParaView and VTK python 
code.

	Seb

	On Wed, Aug 6, 2014 at 1:35 PM, Andy Bauer <andy.bauer at kitware.com> wrote:

		It may not be possible to do what you want explicitly. ParaView can be 
viewed in some ways a wrapper around VTK filters. You can try the programmable 
filter which uses the VTK Python API but is still intended to operate like a 
filter (i.e. not modifying the input data sets, etc.).

		Andy

		On Wed, Aug 6, 2014 at 3:28 PM, Su, Simon M CTR USARMY ARL (US) 
<simon.m.su.ctr at mail.mil> wrote:

			Classification: UNCLASSIFIED
			Caveats: NONE

			Hello,

			I would like to run some of my VTK python code under ParaView (pvbatch or
			pvpython). Where can I find documentation on porting VTK python code to use
			ParaView python api? I need to create some VTK object in ParaView. Is there
			a shortcut to this (like being able to use VTK python api within ParaView
			Python environment)?  Or am I not making sense / asking the wrong question.

			Any help is much appreciated.

			Thanks
			-simon

			Classification: UNCLASSIFIED
			Caveats: NONE

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Classification: UNCLASSIFIED
Caveats: NONE

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