[Paraview] Integrate a scalar over a volume

[Jean Hertzberg]

I am trying to integrate a scalar over a 3D volume. I was surprised to find that the Integrate Variables filter does not do this; when integrating a scalar variable of 1 over a cube of size 1 X 1 X 1, Integrate Variables returns the value of 6. The documentation says it will integrate over lines and surfaces only. Suggestions please.

Additional context: I am working with velocity field data, read in via the Ensight format. I have calculated vorticity, and vorticity magnitude, and I want the integral of the vorticity magnitude in a volume defined by an extracted subset.
Thanks
-Jean

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