[Paraview] Programmable filter - input data and output data

Mon Jan 16 10:33:02 EST 2017

Hmm, that's odd. Does it make a difference if you do things in the
following order:

* Add Programmable Filter
* Change the output type to vtkUnstructuredGrid
* Paste in script
* Hit Apply now, but only after the first steps have been completed

I recall that there is some funny behavior if you apply the filter and then
change the output data type, so my guess is to make sure the output data
type is set before applying.

Thanks,
Cory

On Fri, Jan 13, 2017 at 10:36 AM, Crepier, Pierre <P.Crepier at marin.nl>
wrote:

> 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 <+31%20317%20493%20475> | P.Crepier at marin.nl |
> www.marin.nl
>
> [image: LinkedIn] <https://www.linkedin.com/company/marin> [image:
> YouTube] <http://www.youtube.com/marinmultimedia> [image: Twitter]
> <https://twitter.com/MARIN_nieuws> [image: Facebook]
> <https://www.facebook.com/marin.wageningen>
> MARIN news: Few places left for Offshore and Ship hydrodynamics courses
> <http://www.marin.nl/web/News/News-items/Few-places-left-for-Offshore-and-Ship-hydrodynamics-courses.htm>
>
> *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>
> 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 <+31%20317%20493%20475> | P.Crepier at marin.nl |
> www.marin.nl
>
> [image: LinkedIn] <https://www.linkedin.com/company/marin> [image:
> YouTube] <http://www.youtube.com/marinmultimedia> [image: Twitter]
> <https://twitter.com/MARIN_nieuws> [image: Facebook]
> <https://www.facebook.com/marin.wageningen>
> MARIN news: Modelling natural transition on hydrofoils for application in
> underwater gliders
> <http://www.marin.nl/web/News/News-items/Modelling-natural-transition-on-hydrofoils-for-application-in-underwater-gliders-1.htm>
>
>
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>
> --
>
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
>

-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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