[Paraview] Using pvpython to load states with filenames

[Moreland, Kenneth]

Bill,


This doesn't answer your question but instead provides an alternative. You
can save the state as a python script. Since the point is to recreate the
state within a pvpython, this might be a more natural way to do it anyway.
The Python script should be straightforward to edit to use variables for
filenames instead of constants.

-Ken

On 5/20/14 12:18 PM, "Bill Sherman" <shermanw at indiana.edu> wrote:

>Greetings all,
>
>A question on how one can use ParaView state files in a scripting mode,
>where the file directory is different.  To be specific, I'm creating a
>state file using the ParaView GUI client (version 4.0.1), and I then save
>the state, and then in pvpython I can load the state and write out an
>animation.  This works fine as long as I'm on the same machine, or at
>least have the same directory name containing the data files.
>
>My goal, however, is to now run those animation scripts on a Cray, where
>my directory structure is different.
>
>So first a disclaimer -- I figured out how to do this by doing a
>mass-substitution
>in vim, setting all the filenames to begin with "./" instead of the full
>path, and then running pvpython in the directory with the data.  This
>works.
>
>But, I'd prefer a cleaner/more-elegant means of doing this, and so I come
>to this well of information.
>
>First question: is there a way to prevent "pvpython" from loading data
>files when then state is read?  Otherwise I get a slew of errors when
>it discovers that the files don't exist.  Somehow the ParaView GUI Client
>must do this, because it will provide a popup asking for a new directory
>in which to find the missing files.
>
>Second question: ignoring the error messages, I still can't manage to
>change the file names and have pvpython use the new names -- so question
>is: what am I doing wrong?
>
>Here's the basics of what I've tried:
>
> >>> from paraview.simple import *
> >>> servermanager.LoadState("testC.pvsm")
> >>> olddir = "/directory-in-state-file"
> >>> newdir = "/cray-directory-with-data"
> >>> reader = FindSource("jhdata_*")
> >>> for num in range(0, len(reader.FileNames)):
>...   reader.FileNames[num] = reader.FileNames[num].replace(olddir,
>newdir)
>
>I can then print all the filenames, and they appear to have been changed.
>But I can't seem to get the servermanager to recognize this.  I tried:
>
> >>> reader.FileNameChanged()
> >>> UpdatePipelineInformation()
>
>this returns the error:
>
>---------
>ERROR: In 
>/N/soft/cle4/paraview/ParaView-v4.0.1-source/VTK/IO/Parallel/vtkPDataSetRe
>ader.cxx, 
>line 880
>vtkPDataSetReader (0x1fa4d70): Initialize: Could not open file
>olddir/jhdata_001.vtk
>
>ERROR: In 
>/N/soft/cle4/paraview/ParaView-v4.0.1-source/VTK/Common/ExecutionModel/vtk
>Executive.cxx, 
>line 754
>vtkPVCompositeDataPipeline (0x1f579f0): Algorithm
>vtkFileSeriesReader(0x1fbc7b0) returned failure for request:
>vtkInformation (0x13c0890)
>   Debug: Off
>   Modified Time: 147820
>   Reference Count: 1
>   Registered Events: (none)
>   Request: REQUEST_DATA_OBJECT
>   FORWARD_DIRECTION: 0
>   ALGORITHM_AFTER_FORWARD: 1
>----------
>
>I then also tried
> >>> reader.UpdatePipeline()
>
>with the same results.  If I then tried to call "WriteImage()" or
>"WriteAnimation",
>it complains and then seg-faults.
>
>
>Once this is all settled, of course I'll transition to "pvbatch" to
>queue things up, which I anticipate should work with what I learn
>from interacting with "pvpython".
>
>     Thanks!
>     Bill
>
>-- 
>Bill Sherman
>Sr. Technology Advisor
>Advanced Visualization Lab
>Pervasive Technology Inst
>Indiana University
>shermanw at indiana.edu
>
>
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