[Paraview] PV 4.1.0 computing 3D lift and drag coefficients wing-body-nacelle combination

[Andy Bauer]

Hi Stephen,

After thresholding you'll have an unstructured grid again. Can you try
extract surface after that again to convert it to a polydata. Then you
should be able to generate surface normals. If you don't have gradients
available you'll want to compute them before you do the first extract
surface filter as well.

Regards,
Andy


On Fri, Apr 25, 2014 at 7:40 AM, Stephen Wornom <stephen.wornom at inria.fr>wrote:

> I do:
> - select extract surface
> - select connectivity
> - threshhold (to say what surface)
> I now have the surface of the wing and nacelle visible.
>
> To compute the lift and drag, I need to generate surface normals. But this
> filter is not active.
> How do I generate surface normals?
> Thanks,
> Stephen
>
> --
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