[Paraview] Vorticity computation from separated velocity array

[Andy Bauer]

What version of ParaView are you using?  I was able to use
"hstack([VelocityX, VelocityY, VelocityZ])" with the Python Calculator
filter in v3.14.1. Alternatively you could try the Calculator filter with
"iHat*VelocityX+jHat*VelocityY+kHat*VelocityZ".

Andy

On Wed, Oct 24, 2012 at 12:17 PM, 中田拓馬 <uirosan at gmail.com> wrote:

> Dear all,
>
> I am trying to compute vorticity from separated velocity vectors, but
> pre-installed filter of paraview seems to require 3-components vector as an
> input. Then, I have tried to use the "Python Calculator" filter to
> construct it.  I put "hstack([VelocityX, VelocityY, VelocityZ])" into the
> "Expression" field following the wiki.  However, it created just a copy of
> VelocityX instead of 3-components vector.  How can I construct 3-components
> array form separated velocity vectors?
>
> I have also tried to use the "Programmable Filter".  But, it has been
> really difficult for me and I could not just extract the vector from the
> input.  The vectors live in vtkUnstructuredGrid in a vtkMultiBlockDataSet
> and there are no function to extract Point Data form it.
>
> Regards,
>
> Makoto
>
>
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