[Paraview] Programmable filter from external python program

[Utkarsh Ayachit]

Did you call an UpdatePipeline before checking for point-data arrays?
e.g.

ProgrammableFilter1.UpdatePipeline()
print ProgrammableFilter1.PointData.GetNumberOfArrays()


Utkarsh

On Wed, Mar 5, 2014 at 8:31 PM, Simon Couture
<simon-2.couture at polymtl.ca> wrote:
> Hi everyone,
>
> I am trying to use paraview from an external python program where I import
> paraview.simple and mostly use python code generated by Paraview's trace tool
> to accomplish what I want. In general it works well, but in one instance I need
> to generate a new data array from my source/reader, and as far as I know, the
> programmable filter is the only way to do this (the actual PointData arrays of
> the sources are not directly visible/editable through the python shell). Now
> when I try to execute the python code that I get from trace to insert a
> programmable filter with a given script, the PointData array that the
> programmable filter's script is supposed to create is not created (and it does
> work when I create the programmable filter using the Paraview GUI).
>
> To be more clear, here is the python code that I run (cutting out camera and
> rendering commands):
>
> mysource = AVSUCDReader( FileNames=['/home/myfile.inp'] )
>
> mysource.PointArrayStatus = []
> mysource.CellArrayStatus = []
>
> RenderView1 = GetRenderView()
> DataRepresentation3 = Show()
> ProgrammableFilter1 = ProgrammableFilter()
> DataRepresentation4 = Show()
> ProgrammableFilter1.RequestUpdateExtentScript = ''
> ProgrammableFilter1.PythonPath = ''
> ProgrammableFilter1.RequestInformationScript = ''
> ProgrammableFilter1.Script = "pdi = self.GetInput()\nnbpoints =
> pdi.GetNumberOfPoints()\ninput_pointdata = pdi.GetPointData().GetArray('data')
> [... the rest of my script here]"
>
> After running this in either the paraview python shell or from an external
> python program, if I do for instance:
>
> ProgrammableFilter1.PointData.GetNumberOfArrays()
>
> I get 0 meaning that no PointData array was created, whereas if the same
> programmable filter is created in the paraview GUI, I would get 1. Please note
> that I am not using the Copy Arrays option of the programmable filter.
>
> Has anyone successfully used the programmable filter from a python script?
>
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