[Paraview] Problem to compute the gradient of a scalar field

[Andy Bauer]

I mispelled it -- it's the Tessellate filter.

I'm not sure how the Point Data To Cell Data filter is supposed to fix the
problem. The Gradient of Unstructured Data Set filter uses that filter in
the implementation.

On Fri, Jul 15, 2016 at 7:37 AM, Stéphane Dellacherie <
stephane.dellacherie at polymtl.ca> wrote:

> Dear Andy,
>
> Thank you for your answer.
>
> I don't find the "tesselate filter" in the alphabetical list : would you
> tell me what is the right filter ? Thank you.
>
> Moreover, if the pb is due to the fact that I use quadratic triangles, the
> filter GradientOfUnstructuredDataSet should works after the use of the
> filter PointDataToCellData ? But it does not still work.
>
> Best
>
> Stéph
>
>
> Le 14/07/2016 20:17, Andy Bauer a écrit :
>
> Hi,
>
> It looks like gradients aren't getting  computed properly for quadratic
> triangles. A quick work around is to use the tesselate filter to subdivide
> the quadratic triangles while converting them to linear triangles. The
> gradient of unstructured data filter should work after that. I'll add in a
> bug report to see about getting this fixed as well.
>
> Best,
> Andy
>
> On Thu, Jul 14, 2016 at 5:23 PM, Stéphane Dellacherie <
> stephane.dellacherie at polymtl.ca> wrote:
>
>> Dear Colleague,
>>
>> I am trying to use the fielter GradientOfUnstructuredDataSet on the field
>> T which is in the vtk file example.vtk (see the joined file). Nevertheless,
>> I only obtain a NULL gradient (see the file tutu.png) although the T field
>> is not a constant scalar field.
>>
>> Is it normal ?
>>
>> Thank you for your help !
>>
>> With my best regards.
>>
>> Stéphane
>>
>> --
>> ___________________________________________________________
>>
>> Stéphane Dellacherie
>>
>> CEA Paris-Saclay / Direction de l’Énergie Nucléaire
>>
>> École Polytechnique de Montréal / Dpt de Génie Mécanique
>>
>> Tél. : (001) 514.340.47.11 (#2488)
>> ___________________________________________________________
>>
>>
>>
>>
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>
> --
> ___________________________________________________________
>
> Stéphane Dellacherie
>
> CEA Paris-Saclay / Direction de l’Énergie Nucléaire
>
> École Polytechnique de Montréal / Dpt de Génie Mécanique
>
> Tél. : (001) 514.340.47.11 (#2488)
> ___________________________________________________________
>
>
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