[Paraview-developers] vtkReflectionFilter with multiple vector fields

[Joachim Pouderoux]

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>:

> 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
> MARIN | T +31 317 49 35 06 | M.Deij at marin.nl | www.marin.nl
>
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