[Paraview] Combining vtk and paraview python scripts

[Jeff Becker]

On 07/14/2015 12:20 PM, Andy Bauer wrote:
> ParaView's Python Programmable Filter and Python Programmable Source 
> use VTK Python wrapping to do the work while making it available in 
> Paraview. Check out 
> http://www.paraview.org/Wiki/Python_Programmable_Filter.

Thanks. That's pretty neat, but what I'd really like is a standalone 
script I can run in batch mode (no interaction) to generate one png file 
per timestep for all the timesteps in the data set. Essentially I'd like 
a way to construct a pipeline between the vtk.vtkImageImport()  object 
and the ParaView renderView1.

-jeff
>
> On Tue, Jul 14, 2015 at 2:59 PM, Jeff Becker 
> <jeffrey.c.becker at nasa.gov <mailto:jeffrey.c.becker at nasa.gov>> wrote:
>
>     Hi.
>
>     As a proof of concept, I have a vtk script that reads some binary
>     data, and produces a vti file. I then have a second script that I
>     generated using ParaView's tracing facility while viewing the
>     data. Now I'd like to combine them, so as to eliminate the
>     intermediate file, i.e., go from binary data directly to
>     rendering. To be specific, my vtk script ends like this:
>
>     steinbmag = steinbmag.reshape(nx,ny,nz).T
>
>     vtkImporter = vtk.vtkImageImport()
>     vtkImporter.CopyImportVoidPointer(steinbmag, steinbmag.nbytes)
>
>     vtkImporter.SetDataScalarTypeToFloat()
>     vtkImporter.SetNumberOfScalarComponents(1)
>     vtkImporter.SetDataExtent(0, nx-1, 0, ny-1, 0, nz-1)
>     vtkImporter.SetWholeExtent(0, nx-1, 0, ny-1, 0, nz-1)
>     vtkImporter.SetScalarArrayName('B field magnitude')
>
>     writer=vtk.vtkXMLImageDataWriter()
>     writer.SetFileName(out_fname)
>     writer.SetInputConnection(vtkImporter.GetOutputPort())
>     writer.Write()
>
>     and the ParaView script starts like this:
>
>     from paraview.simple import *
>
>     paraview.simple._DisableFirstRenderCameraReset()
>
>     filepfx = '/nobackup/jcbecker/steinBmag_0'
>     infile = filepfx+'.vti'
>     # create a new 'XML Image Data Reader'
>     steinBmag_ = XMLImageDataReader(FileName=infile)
>     steinBmag_.CellArrayStatus = []
>     steinBmag_.PointArrayStatus = ['B field magnitude']
>
>     # get animation scene
>     animationScene1 = GetAnimationScene()
>
>     # update animation scene based on data timesteps
>     animationScene1.UpdateAnimationUsingDataTimeSteps()
>
>     # get active view
>     renderView1 = GetActiveViewOrCreate('RenderView')
>     # uncomment following to set a specific view size
>     renderView1.ViewSize = [1090, 761]
>
>     I'm looking at the VTK examples and pvpython documentation, but
>     any help is appreciated.
>
>     Thanks.
>
>     -jeff
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