[Paraview] Vorticity computation from separated velocity array

[中田拓馬]

Andy,

Today, I have tried again on 3.12.0.  I don't know why but today both of
the methods you mentioned work.

Thank you.

Makoto


2012/10/25 Andy Bauer <andy.bauer at kitware.com>

> 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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