[Paraview] Write and read a vtk file (in python)
Eric E. Monson
emonson at cs.duke.edu
Tue Jun 8 08:44:30 EDT 2010
Hey Jérôme,
If you're doing this from the Python Shell within ParaView, then it looks like the correct attribute is ps.ScriptRequestInformation
Another solution would be to save your programmable source as a "custom filter", and then load it back in to Python when you need it. I'd be curious to hear if there is a more streamlined way to do this now -- the method from a year and a half ago was detailed by Berk here:
http://www.mail-archive.com/paraview@paraview.org/msg01990.html
but I know there has been a lot of refinement of the interface since then.
Good luck,
-Eric
On Jun 8, 2010, at 8:18 AM, Jérôme Plumecoq wrote:
> Hello,
>
> Thank you Eric : now I can read my datas with a ProgrammableSource, and display them.
>
> But I would like to create a ProgrammableSource in a python script, and I have this error when I try to set the InformationScript (which is necessary to display the datas) attribute :
>
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "/home/plumecoq/EHPOC/plugins/ElsaMenu/elsa.py", line 106, in <module>
> main()
> File "/home/plumecoq/EHPOC/plugins/ElsaMenu/elsa.py", line 85, in main
> ps.InformationScript = str_information_script
> File "/home/plumecoq/Paraview/ParaView-3.8.0-bin/Utilities/VTKPythonWrapping/paraview/servermanager.py", line 201, in __setattr__
> "to add this attribute.")
> AttributeError: Attribute InformationScript does not exist. This class does not allow addition of new attributes to avoid mistakes due to typos. Use add_attribute() if you really want to add this attribute.
>
>
> My code is :
>
> # solution 2 : Programmable Source
> ps = ProgrammableSource()
> ps.OutputDataSetType = 2 # 2 : Structured Grid, 13 : MultiblockDataSet
> str_script = """
> import lecture_v3d as v3d
> reader = v3d.V3dReader("/home/plumecoq/tmp/ParaView/flow_1_0075.v3d")
> self.GetOutput().DeepCopy(reader.bloc_vts)
> """
> ps.Script = str_script
>
> str_information_script = """
> from paraview import util
> util.SetOutputWholeExtent(self, [0, 10, 0, 10, 0, 30])
> """
> ps.InformationScript = str_information_script
>
>
> when I put the string str_information_script in the window Script(RequestInformation) of the ProgrammableSource, it works fine.
>
> any ideas ?
>
> Jérôme
>
> Le 07/06/2010 13:30, Eric E. Monson a écrit :
>>
>> Hey Jérôme,
>>
>> Yes, you can use the Python Programmable Source as a reader. There are some examples on these two pages, in case you haven't seen them:
>>
>> http://www.paraview.org/Wiki/Here_are_some_more_examples_of_simple_ParaView_3_python_filters
>> http://www.paraview.org/Wiki/Python_Programmable_Filter
>>
>> -Eric
>>
>> ------------------------------------------------------
>> Eric E Monson
>> Duke Visualization Technology Group
>>
>>
>> On Jun 7, 2010, at 4:58 AM, Jérôme Plumecoq wrote:
>>
>>> Hello,
>>>
>>> thank you very much !
>>>
>>> Do you know if is possible to write directly a reader in python ?
>>>
>>> Or is it only possible in C++ ?
>>>
>>> Jérôme
>>>
>>> Le 04/06/2010 15:37, Utkarsh Ayachit a écrit :
>>>>
>>>> There was a bug in OpenDataFile() that was fixed a few days ago (May
>>>> 26) that is causing that "AttributeError: Attribute FileName does not
>>>> exist". Attached is a patch for the same.
>>>>
>>>> Utkarsh
>>>>
>>>> 2010/6/4 Berk Geveci <berk.geveci at kitware.com>:
>>>>
>>>>>> 1) reading :
>>>>>> ------------
>>>>>>
>>>>>> from a vtkStructuredGrid object, I use a vtkStructuredGridWriter to create a
>>>>>> vtk file, and I have the following problem :
>>>>>> when I launch the script in Paraview, the format of floating points is not
>>>>>> good (I obtain for example 33,1632 instead of 33.1632). So, the file created
>>>>>> is not readable by Paraview. If I launch the script directly in a terminal,
>>>>>> it works fine. Perhaps because the version of vtk module is not the same ?
>>>>>> If I use the binary format I have not this problem.
>>>>>>
>>>>> This seems to be related to the way the LOCALE is set on your system. It is
>>>>> probably set to French in one case and English in the other. Does anybody know
>>>>> if we can force LOCALE to English in the ParaView application or the reader?
>>>>>
>>>>>
>>>>>> 2) writing :
>>>>>> ------------
>>>>>>
>>>>>> I would like to read my vtk files from the python shell, with
>>>>>> OpenDataFile(), but It didn't succeed and I have the following message (with
>>>>>> a file which can be read in paraview using menu open of course :-) :
>>>>>>
>>>>> Unless I am mistaken, you give the filename directly to OpenDataFile(),
>>>>> without FileName=.
>>>>>
>>>>> -berk
>>>>>
>>>>>
>>>>>> /home/plumecoq/tmp/ParaView/flow_1_0075.vtk
>>>>>> Traceback (most recent call last):
>>>>>> File "<string>", line 1, in <module>
>>>>>> File "/home/plumecoq/EHPOC/plugins/ElsaMenu/elsa.py", line 91, in <module>
>>>>>> main()
>>>>>> File "/home/plumecoq/EHPOC/plugins/ElsaMenu/elsa.py", line 73, in main
>>>>>> reader_vtk = OpenDataFile(file_name_vtk)
>>>>>> File
>>>>>> "/home/plumecoq/Paraview/ParaView-3.8.0-bin/Utilities/VTKPythonWrapping/paraview/simple.py",
>>>>>> line 115, in OpenDataFile
>>>>>> reader = globals()[xml_name](FileName=filename, **extraArgs)
>>>>>> File
>>>>>> "/home/plumecoq/Paraview/ParaView-3.8.0-bin/Utilities/VTKPythonWrapping/paraview/simple.py",
>>>>>> line 542, in CreateObject
>>>>>> setattr(px, param, params[param])
>>>>>> File
>>>>>> "/home/plumecoq/Paraview/ParaView-3.8.0-bin/Utilities/VTKPythonWrapping/paraview/servermanager.py",
>>>>>> line 201, in __setattr__
>>>>>> "to add this attribute.")
>>>>>> AttributeError: Attribute FileName does not exist. This class does not
>>>>>> allow addition of new attributes to avoid mistakes due to typos. Use
>>>>>> add_attribute() if you really want to add this attribute.
>>>>>>
>>>>>>
>>>>>> any ideas ? I try to use LegacyVTKFileReader instead, but I have also some
>>>>>> problems.
>>>>>>
>>>>>> I use a re-compile version of Paraview 3.8, under Linux (Fedora 10 - 64
>>>>>> bits)
>>>>>>
>>>>>> thanks for your help.
>>>>>>
>>>>>> Jérôme
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
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>>>>>>
>>>>>>
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>>>>>
>>>
>>> <jerome_plumecoq.vcf>_______________________________________________
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>>>
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>>>
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>
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>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
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>
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