[Paraview] Bug or feature?

[Andy Bauer]

Hi,

I am able to do a volume visualization for each component of a 3 component
array (i.e. a vector) of both point and cell data in PV 5.3. This was done
with a both a vtkImageData and a vtkUnstructuredGrid. Once I choose my 3
component array for volume rendering in the upper left corner of the GUI,
the default is the Magnitude but I can switch to each component as well
with the drop down dialog that is just to the right of where I choose which
array I want to pseudo-color by.

Any chance you could share your dataset and specific instructions on how
you're doing things? Alternatively, you can use the Calculator filter to
extract one component of your multi-component array but this is a bit
computationally wasteful.

Cheers,
Andy

On Sat, May 6, 2017 at 12:15 PM, Cornelis Bockemühl <
cornelis.bockemuehl at gmail.com> wrote:

> Dear Paraview users and experts,
>
> In some project I am generating a dataset that has a multi-component
> column as a result, with a variable number of columns depending on the
> problem. These data are "cell data" of some "unstructured grid", and I can
> nicely visualize it in Paraview, component by component.
>
> Only with the visualization as a "volume" I have problems: It seems that
> with this you can only visualize the "magnitude", while switching between
> the components does not work! This works only in other viewing modes, but
> the "volume" is sometimes very useful because you can look "inside" the
> volume.
>
> Now I am asking myself if this is a bug (with a certain chance to have it
> fixed or even fix it myself...) or a feature?
>
> I mean: the fact that "magnitude" is the default for displaying
> multi-component arrays already gives some hint in the direction: this type
> of columns is mostly intended to be used as coordinates! Which is actually
> not my case.
>
> Technically I could of course switch to just generating a set of
> single-component arrays instead of one multi-component array. I only did it
> otherwise because the columns are very closely related, so it looked like a
> good idea initially...
>
> Any hint or experience?
>
> Regards,
> Cornelis
>
> PS: I am using Paraview 5.3 on Windows 64bit
>
> --
> Cornelis Bockemühl
> Basel, Schweiz
>
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