Re: [Getfem-users] quadratic mesh, step 2

[Edouard Oudet]

Dear Yves,

Thanks a lot for your answer, that's perfectly clear now.. and works!

One more question: working on triangulated (curved) surface in R^3, I am 
interested to evaluate the gradient of a fem function at some point of 
this curved mesh. When my mesh was flat I used to build a model and call 
the interpolation of "Grad_u" on my mesh at a point P which was inside 
of the mesh.

Now that the mesh is curved, it is more tricky to produce a point which 
is exactly on the curved mesh like, for instance, the center of a curved 
triangle. Here are my (I hope last) questions:

1) Is it possible to generate points inside of a curved convex cell 
described by a mesh?
2) How to interpolate the gradient at these points. Does the same 
procedure work even if the point is never exactly on the curved mesh ?

Thanks a lot for your work and Happy new Year !!!

Best,

Edouard.

Le 29/12/2018 à 20:47, Yves Renard a écrit :
> Dear Edouard,
>
> The point ordering is the same that the corresponding fem. You can see the dof 
> ordering of fem in the page
>
> http://getfem.org/userdoc/appendixA.html
>
> And yes, of course, it is possible to also mesh curved surfaces in 3D.
>
>
> Best regards,
>
> Yves
>
> ----- Original Message -----
> From: "EDOUARD OUDET" <address@hidden>
> To: "getfem-users" <address@hidden>
> Sent: Saturday, December 29, 2018 8:05:04 PM
> Subject: [Getfem-users] quadratic mesh, step 2
>
> I answer to the first part of my question: curved mesh seem to be
> implemented regarding examples in the tests/meshes folder. Great!!
> My remaining questions are:
> 1) How/where is defined the ordering point sequence which defines a
> curved convex cell in a getfem-mesh file?
> 2) curved mesh seem to be implemented in 2D, 3D but is it also the case
> for surfaces (triangulation in 3D)?
> Thanks!

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