[Gmsh] topography issues

[Luis Henrique Camargo Quiroz]

    Hi Octávio,

    Why not a flat bottomed second layer, say, on top of the first... it
seems that a exclusion (subtraction) would give you the layer with the
right bottom topography to later combine with the first layer. This helps?

  regards,

  Luís Henrique Camargo Quiroz

Em sex, 21 de set de 2018 às 08:37, Octavio Castillo Reyes <
ocastilloreyes at gmail.com> escreveu:

> Dear all,
>
> I'm interested too. My domains are composed 3, 4 or 5 materials (maybe
> more) where each interface might include a topography. For instance, do you
> know if is possible include another layer to the model proposed by Riad
> Hassani?
>
> Any idea?
>
> Best regards
>
> O.
>
> On Fri, Sep 21, 2018 at 12:37 PM Riad HASSANI <Riad.Hassani at unice.fr>
> wrote:
>
>> 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
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>>
>> -----------------------------------------------------------------
>> 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
>>
>>
>>
>>
>>
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