[Paraview] Programmable filter - input data and output data

Fri Jan 13 10:36:10 EST 2017

Cory,

Thanks for your quick answer and clarifying the context.

So if I try to reproduce the behaviour of the clip filter, I would do:

import vtk
input = self.GetInputDataObject(0, 0)

plane = vtk.vtkPlane()
plane.SetOrigin(-4.0, 0.0, 0.0)
plane.SetNormal(1.0, 0.0, 0.0)

xMin = vtk.vtkClipDataSet()
xMin.SetClipFunction(plane)
xMin.SetInputData(input)
xMin.Update()

self.GetOutput().ShallowCopy(xMin.GetOutput())

I changed to the “Output Data Set Type” to vtkUnstructuredGrid.

I tried but paraview stops responding ...
Where am I doing something wrong ? and what am I doing wrong ?

Thanks,
Pierre

ir. Pierre Crepier | Project Manager Ships | CFD
MARIN | T +31 317 49 34 75 | P.Crepier at marin.nl<mailto:P.Crepier at marin.nl> | www.marin.nl<http://www.marin.nl>

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From: Cory Quammen [mailto:cory.quammen at kitware.com]
Sent: Wednesday, January 11, 2017 3:33 PM
To: Crepier, Pierre
Cc: paraview at paraview.org
Subject: Re: [Paraview] Programmable filter - input data and output data

Pierre,

First thing first. The code inside the Programmable Filter script runs in a context in which it is aware of VTK only and not ParaView, so you cannot use paraview.simple module functions such as Clip. Instead, you would need to use a VTK-equivalent. In this case, you would use vtkClipDataSet:

import vtk

plane = vtk.vtkPlane()
plane.SetOrigin(-4.0, 0.0, 0.0)
plane.SetNormal(1.0, 1.0, 1.0)

clip = vtk.vtkClipDataSet()
clip.SetClipFunction(plane)
clip.SetInputData(input)
clip.Update()

Next, to use the output of the clip filter as the output of the Programmable Filter, do the following.

self.GetOutput().ShallowCopy(clip.GetOutput())

Make sure you change the Output Data Set Type to vtkUnstructuredGrid if you go this way.

Hope that helps,
Cory

On Wed, Jan 11, 2017 at 8:49 AM, Crepier, Pierre <P.Crepier at marin.nl<mailto:P.Crepier at marin.nl>> wrote:
Hi everyone,

I am trying to use the programmable filter to combine multiple filters. Sort of like the custom filter but I want to have control over some of the properties using user input.

If I understood correctly, I can get the input data with:
input = self.GetInputDataObject(0, 0)

then I can use this input in a filter:
xMin = Clip(Input=input)
xMin.ClipType = 'Plane'
xMin.Crinkleclip = 1
xMin.ClipType.Origin = [-4.0, 0.0, 0.0]
xMin.ClipType.Normal = [1.0, 0.0, 0.0]

Now, how can I use the output of this filter as output of my programmable filter ?

Thanks in advance,
Pierre

ir. Pierre Crepier | Project Manager Ships | CFD
MARIN | T +31 317 49 34 75<tel:+31%20317%20493%20475> | P.Crepier at marin.nl<mailto:P.Crepier at marin.nl> | www.marin.nl<http://www.marin.nl>

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Cory Quammen
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