[Paraview] pvbatch: Manipulate file list of loaded state file

Tue Oct 5 06:47:50 EDT 2010

Hello Fabian,

I never got that working and eventually gave up.
But - this was a year ago. In the meantime Utkarsh and David have added a possibility to alter the file when loading a state file. In the GUI a dialog pops up when loading a state file which allows to change every file referenced in the state file. I haven't tried, though, whether this feature is available from Python.

Karl

Fabian Braennstroem wrote, On 10/04/10 17:15:
>Hello Karl,
>
>I wonder, if you had success with your approach!? Actually, I would like 
>to do similar with these lines:
>
>from paraview.simple import *
>servermanager.LoadState("/home/gcae504/Dissertation/3D_Nielsen/OpenFoam/01_SAS_SSTF_URANS/01__56T_SST/STREAM_SLICE0.pvsm")
>SetActiveView(GetRenderView())
>Render()
>sources=GetSources()
>print "Sources: ", sources
>FindSource("Slice1").SliceType.Origin = [5.0, 1.0, 1.0]
>print FindSource("Slice1").SliceType.Origin
>Render()
>
>For the first test, I would like to change the Slice origin.
>Unfortunately, the script gives me a segmentation fault using the 
>Python-Shell from within paraview and using pvpython it simply gives a 
>black picture.
>I do not use the python trace state option as there are some settings 
>missing and the above approach would fit better into my daily working 
>style.
>
>Would be nice, if you have a suggestion how to do this and how to change 
>the source file name!?
>
>Thanks in advance!
>Fabian
>
>On 10/13/2009 12:52 AM, Moreland, Kenneth wrote:
>> Hopefully someone will have answered your question by the time I get off
>> this airplane and sync my email so that this message gets sent, but
>> allow me to suggest an alternative method. I recommend you try the new
>> Python tracing as an alternative. To do this, turn on Python tracing
>> (currently attached to the Python shell, but should move soon), load the
>> file, set up the pipeline and any other desired state, and then save the
>> state. Load the resulting Python shell in your favorite editor and
>> change it to load the files you really want.
>>
>> This use case of loading state files is really just a workaround to the
>> fact that you could not directly output a Python script from ParaView.
>> Now that you can automatically create scripts from within ParaView,
>> loading state files from scripts is (mostly) obsolete.
>>
>> -Ken
>>
>>
>> On 10/11/09 1:55 PM, "Karl König" <kkoenig11 at web.de> wrote:
>>
>>     Hi,
>>
>>     I've been trying to no avail for many hours now to do something that
>>     sounds quite simple to do, but seems to be not yet documented in the PV
>>     wiki, the tutorials, PV presentation slides nor the mailing list.
>>     I hope someone can give me a hint what I'm doing wrong.
>>
>>     The thing I'm trying to do is a variant of what Kent posted 1,5 year ago
>>     about and Utkarsh gave advice on
>>     (http://www.paraview.org/pipermail/paraview/2008-February/007134.html):
>>
>>     1) Load a single file from a file series, not a file series, create a
>>     pipeline and save a state file.
>>
>>     2) Let pvbatch load the state file, swap the file for a file list
>>     (determined via glob, see e.g. page 7 of
>>     http://www.cscs.ch/fileadmin/user_upload/customers/users_entry_point/HORUS_Doc/PvPython.pdf)
>>     and iterate over all files
>>
>>     I've successfully loaded the state file and manipulated the source
>>     proxy's FileName property, extracted the scene object by means of
>>     servermanager.ProxyManager, updated the animation scene's TimeKeeper
>>     object and then repeatedly called scene.GoToNext(). But the new file
>>     list got not respected, still only the file mentioned in the state file
>>     gets loaded.
>>
>>     I've also tried to create a new reader instance with the file list as
>>     argument, looped over all source proxies within the state file and
>>     changed their Input property in case that were a reader. Then, created a
>>     new animation scene in the same way as AnimateReader does it in
>>     Utilities/VTKPythonWrapping/paraview/servermanager.py and tried again to
>>     loop over all files. Still not working.
>>     Saving the state file from pvbatch and loading it into ParaView
>>     confirmed that I'm missing something as ParaView spits out quite some
>>     error messages for those objects I swapped the input for:
>>     "Input port 0 of algorithm vtkExtractBlock has 0 connections but is not
>>     optional."
>>
>>     Is there someone who accomplished loading a state file and manipulating
>>     the reader's file list and is willing to share his knowledge?
>>
>>     Thanks a lot
>>     Karl
>>
>>
>>     N.B.:
>>     If there is a solution to this problem, it could also pose an
>>     approximate alternative solution for those looking for support for live
>>     data in PV, an issue discussed just recently here: By means of a timer,
>>     file size or file inspection it would be easy enough to have Python
>>     ensure the validity of an input fill, then re-execute the pipeline for
>>     the new file, create a snapshot automatically and wait for the next file
>>     to appear.
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>>
>>
>>
>> **** Kenneth Moreland
>> *** Sandia National Laboratories
>> ***********
>> *** *** *** email: kmorel at sandia.gov
>> ** *** ** phone: (505) 844-8919
>> *** web: http://www.cs.unm.edu/~kmorel
>>
>>
>> ------------------------------------------------------------------------
>>
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