[Paraview] Paraview v 3.14, GradientOfUnstructuredDataSet1, vorticity

[Ricardo Reis]

On Wed, 6 Jun 2012, Moreland, Kenneth wrote:

> I am guessing that Vorticity in your dataset is a 3D vector (which is
> typical) and that Q Criterion is a scalar.
>
> When you take the gradient of a vector, you get a 3x3 tensor (an estimate
> of the Jacobian matrix, I believe).  These 9-tuples are not as widely
> recognized in ParaView/VTK filters as scalars and vectors so they will not
> be listed in selection combo boxes for inputs.  You should still see the
> entry listed in the Information panel, though.

This filter, besides calculating the gradient, gives me the option to also 
calculate

  Compute Vorticity
  Compute QCriterion

I'm starting from a velocity vector field. I would expect to obtain, 
after the filter and selecting all options:

  - a gradient (here it gives only 3 main directions)
  - a vorticity vector field
  - a scalar field with QCriterion

  Of these, the vorticity field is absent, even in the information panel.

  best,

  Ricardo Reis

  --

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