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

**From**: |
Edouard Oudet |

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

**Date**: |
Mon, 31 Dec 2018 18:44:30 +0100 |

**User-agent**: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |

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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