[Paraview] Vorticity computation from separated velocity array

[Karl König]

Makoto,

Please see
http://www.paraview.org/Wiki/Beginning_Filters#Calculator_filter and
http://www.paraview.org/Wiki/Advanced_Tips_and_Tricks#Creating_vectors_from_2_or_3_scalars
on how to combine velocity vector components into a 3-components vector.

Karl


中田拓馬 wrote, On 24.10.2012 18:17:
> 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