[Paraview] Gradient calculations

[Barry Wolmarans]

The gradient filter is grayed out not the density

>From: "Barry Wolmarans" <beyond_the_edge at hotmail.com>
>To: paraview at paraview.org
>Subject: [Paraview] Gradient calculations
>Date: Thu, 21 Sep 2006 11:56:37 +0000
>
>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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