[Paraview] visualizing vorticity

[Nico Schlömer]

Hi,

I would like to visualize the vorticity of a given vector field using ParaView.
I've just discovered the ComputeDerivatives filter (choosing
"Vorticity" as "Output Vector Type"). I would now like to have the
result of this calculation displayed as vector field (with arrows) or,
even better, in terms of field lines. (I'm actually describing a
magnetic field here.)
When I choose the glyphs filter, I can choose the original vector
field as input, but not "Vorticity".
Any hints?

Cheers,
Nico