[Paraview] Scripting and new VTK objects

[pat marion]

Paraview does not import the complete vtk python modules when you run that.
Try this:

import libvtkXdmfPython as xm
xm.vtkXdmfReader()

or try import vtkXdmfPython instead of libvtkXdmfPython, the name is
different on different platforms and versions.

Pat

On Wed, Feb 9, 2011 at 5:09 PM, Tim Gallagher <tim.gallagher at gatech.edu>wrote:

> Maybe I'm missing something, but if I
>
> from paraview import vtk
>
> there is no vtkXDMFReader in it. The only vtkX* is vtkXML related. It was
> even compiled with XDMF_WRAP_PYTHON turned on, so maybe it's there but
> called something else?
>
> Tim
>
> ------------------------------
> *From: *"Tim Gallagher" <tim.gallagher at gatech.edu>
> *To: *paraview at paraview.org
> *Sent: *Wednesday, February 9, 2011 4:59:16 PM
>
> *Subject: *Re: [Paraview] Scripting and new VTK objects
>
> We had looked at the programmable source, but we didn't know how to access
> the XDMFReader. But, with what you pointed out, it looks like that isn't
> hard so I'll give it a shot.
>
> Out of curiosity, what is wrong with the approach I was trying? Is it
> possible to completely copy information from one source in a pipeline into
> another source in a pipeline and delete the original source? Why does
> Fetch() show data inside the DataObjectGenerator but no filter can seem to
> access it?
>
> Thanks for the help,
>
> Tim
>
> ------------------------------
> *From: *"pat marion" <pat.marion at kitware.com>
> *To: *gtg085x at mail.gatech.edu
> *Cc: *paraview at paraview.org
> *Sent: *Wednesday, February 9, 2011 4:55:05 PM
> *Subject: *Re: [Paraview] Scripting and new VTK objects
>
> Hi Tim,
>
> Have you looked at the python programmable source?  With the python
> programmable source you can specify python code to run on the server side.
> You won't be able to use paraview python api though.  Instead of
>
> XDMFReader(FileName=...)
>
> it would look like:
>
> reader = vtkXDMFReader()
> reader.SetFileName(...)
> reader.Update()
> data = reader.GetOutput()
>
> You can find examples of the python programmable source:
>
>
> http://www.paraview.org/Wiki/Python_Programmable_Filter#Generating_Data_.28Programmable_Source.29
>
> http://www.paraview.org/Wiki/Here_are_some_more_examples_of_simple_ParaView_3_python_filters
> .
>
> Pat
>
> On Wed, Feb 9, 2011 at 4:20 PM, Tim Gallagher <tim.gallagher at gatech.edu>wrote:
>
>> Hi,
>>
>> I've searched online at length for this and couldn't find the answer, so
>> hopefully somebody here can help me.
>>
>> I am trying to create a new VTK object (vtkMultiBlockDataSet) composed of
>> portions of manipulated data from some other VTK object (in this case, a
>> vtkStructuredGrid). I then want to delete the vtkStructuredGrid object and
>> visualize the new vtkMultiBlockDataSet.
>>
>> So, here's the general outline of what I do in a python script:
>>
>> newSource = DataGeneratorObject(Program="MB{}")
>> newSource.UpdatePipeline()
>>
>> newData = servermanager.Fetch(newSource)
>> newData.SetNumberOfBlocks(64)
>>
>> for n in range(0,64):
>>    myData = XDMFReader(FileName=...)
>>    myData.UpdatePipeline()
>>
>>    localData = servermanager.Fetch(myData)
>>
>>    <manipulate the data>
>>
>>    newData.SetBlock(n,vtk.vtkStructuredGrid())
>>    newData.GetBlock(n).DeepCopy(localData)
>>
>>    Delete(localData)
>>    Delete(myData)
>>
>> newData.DataHasBeenGenerated()
>> newSource.UpdatePipelineInformation()
>> newSource.UpdatePipeline()
>>
>> With all that done, if I try to apply a filter to newSource, it doesn't
>> work. The data is definitely inside newData -- I can print it out and such,
>> even after I delete the localData (which is why I used DeepCopy).
>>
>> But I don't know how to send that data back to the server. Or, maybe I
>> don't need the DataObjectGenerator -- if that's the case, how do I create a
>> local VTK object and then send it to the server to visualize?
>>
>> Hopefully that example is clear... I appreciate any help you guys can
>> provide. It would be easiest if I could create my own custom reader, but I
>> can't do that because we use Paraview on a lot of machines that we can't
>> recompile to include the new plugin.
>>
>> Thanks,
>>
>> Tim
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>
>
> _______________________________________________
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> Visit other Kitware open-source projects at
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>
> Follow this link to subscribe/unsubscribe:
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> _______________________________________________
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>
> 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
>
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