[Gmsh] topography issues

[Riad HASSANI]

Hi Stephanie,

the only trick I had found at the time is in three steps (there may be more direct solutions, if so, I'm interested!):

1) mesh only the "skin" of your domain (2D mesh), save it in a .msh file
2) move the nodes of the surface to match with your topography (use an external program that reads the .msh, interpolates the topography on the appropriate faces and rewrites your .msh).
3) in a .geo file, merge this new .msh, define the volume and then mesh it (3D mesh) (for example, if the initial domain has 6 faces : Merge "skin_modified.msh"; Surface Loop(1) = {1,2,3,4,5,6}; Volume(1)={1}; )

Best,

Riad



Le 21 sept. 2018 à 02:12, Stephanie Jarvis <Stephanie.Jarvis at colorado.edu> a écrit :

> Hello,
> 
> Can gmsh can handle topography? I see this has been asked several times but I can't find a resolution. I have surveyed grid points from a hillslope surface that I need to create a 3D mesh for (top of the box is the hillslope topography, bottom is flat extending into the surface). I've tried embedding the points into a surface I create around them, using Point In Surface, but the points mesh as holes (if they're below that surface) or in the air by themselves (if they're above)--there is no interpolation between them. I've also tried several variations of lines and splines connecting the points, but I can't get that to mesh successfully. Plugin(Tetrahedralize) looks promising, but it's unclear to me how to use it--is it possible to get a "View" out of a bunch of points?  Or do I need to create an interpolated surface outside of gmsh and bring that in to mesh?
> 
> Thank you!
> Stephanie
> _______________________________________________
> gmsh mailing list
> gmsh at onelab.info
> http://onelab.info/mailman/listinfo/gmsh

-----------------------------------------------------------------
Riad HASSANI
GéoAzur
Université Nice-Sophia Antipolis
250 rue Albert Einstein
Sophia Antipolis
06560 Valbonne - France
tel. : 33 (0) 4 83 61 86 71 / 33 (0) 4 92 07 65 89





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://onelab.info/pipermail/gmsh/attachments/20180921/2365f8e5/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PastedGraphic-1.tiff
Type: image/tiff
Size: 99442 bytes
Desc: not available
URL: <http://onelab.info/pipermail/gmsh/attachments/20180921/2365f8e5/attachment-0001.tiff>