The vtkCellDerivatives filter is what you want, I think. I don't think it is included in paraview out of the box. Look here for enabling an existing filter in the GUI: <a href="http://paraview.org/Wiki/ParaView:FAQ#How_do_I_add_my_own_vtk_filter.2Freader_to_ParaView.3F">
http://paraview.org/Wiki/ParaView:FAQ#How_do_I_add_my_own_vtk_filter.2Freader_to_ParaView.3F</a><br><br><div><span class="gmail_quote">On 9/21/06, <b class="gmail_sendername">Barry Wolmarans</b> <<a href="mailto:beyond_the_edge@hotmail.com">
beyond_the_edge@hotmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">The gradient filter is grayed out not the density
<br><br>>From: "Barry Wolmarans" <<a href="mailto:beyond_the_edge@hotmail.com">beyond_the_edge@hotmail.com</a>><br>>To: <a href="mailto:paraview@paraview.org">paraview@paraview.org</a><br>>Subject: [Paraview] Gradient calculations
<br>>Date: Thu, 21 Sep 2006 11:56:37 +0000<br>><br>>hi<br>><br>>I have imported fluent date file as an ensight case file, I woul like to<br>>be able to display the derivitive of the density values. The density filter
<br>>is grayed out.<br>><br>>I am currently creating a cut using a plane to display the density, and<br>>would now like to visualise the density change, is ther any way to do this?<br>><br>>Thanks,<br>>
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