[Paraview-developers] vtkReflectionFilter with multiple vector fields

Tue Nov 22 08:42:35 EST 2016

> you will have to create a un filter

What is an “un filter” – I have never heard of this term.

Thanks and best wishes,

Menno Deij – van Rijswijk

From: Joachim Pouderoux [mailto:joachim.pouderoux at kitware.com]
Sent: Monday, November 21, 2016 7:56 PM
To: Deij-van Rijswijk, Menno
Cc: paraview-developers at paraview.org
Subject: Re: [Paraview-developers] vtkReflectionFilter with multiple vector fields

Hi,
Bad news is that you just can't. There is this concept of "Active Vectors", "Active Scalars" etc. on VTK datasetattributes and only one array can be marked with those tags.
Then some filters only performs on those attributes, while some other allow at least the user to specify which array(s) to process - this is not the case here.
If you want to perform reflection on all 3-components arrays, you will have to create a un filter (that will basically perform what the current one does plus perform the reflections on every arrays that have 3-components).
Best,
Joachim

Joachim Pouderoux, PhD
Technical Expert - Scientific Computing Team
Kitware SAS<http://www.kitware.fr>

2016-11-21 10:40 GMT-04:00 Deij-van Rijswijk, Menno <M.Deij at marin.nl<mailto:M.Deij at marin.nl>>:
Hi,

8 months ago I pushed what I thought was a fix for a problem where data read from the CGNS reader was not properly mirrored by, e.g., the vtkReflectionFilter. The data from the CGNS files we use contains multiple vector fields (velocity, shear stress, you name it).

What I did was to set the vtkDataSetAttributes::VECTORS attribute on all vector fields in the dataset (thinking that with that attribute set, the vtkReflectionFilter would work properly). Indeed, my (it turns out incomplete) tests showed that it did, I was happy, and my fix was merged.

Unfortunately, the users find problems: http://public.kitware.com/pipermail/paraview/2016-October/038152.html
Origin of the problem: my “fix”…. It turns out that if you call dsa->SetVectors(arr) on multiple arrays, only the last array on which it was called remains in the list of data arrays. The previous array for which this attribute was set is removed from the dataset attributes object.

So, my question is: how to do this properly? Looking at the code of the vtkReflectionFilter I see that it gets “the vectors” from the dataset. Unfortunately, in our case there is no concept of “the vectors”. There are multiple vector fields that ALL NEED TO GET MIRRORED by the reflection filter.

Any insight here is very welcome :-)

Best wishes,

Menno Deij – van Rijswijk

dr. ir. Menno A. Deij-van Rijswijk | Researcher / Software Engineer | Maritime Simulation & Software Group
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