[Paraview] Gradient calculations

[Barry Wolmarans]

hi

I have imported fluent date file as an ensight case file,  I woul like to be 
able to display the derivitive of the density values. The density filter is 
grayed out.

I am currently creating a cut using a plane to display the density, and 
would now like to visualise the density change, is ther any way to do this?

Thanks,

Barry

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