[Gmsh] refine existing mesh

[Christophe Geuzaine]

> On 19 Feb 2018, at 08:38, Johannes Töger <johannes.toger at med.lu.se> wrote:
> 
> Dear Christophe,
> 
> The new version of your reparametrization algorithm sounds very interesting for our application. Is it possible for you to tell us a bit more about it?

It's a new implementation of the kinds of methods described in the "Cross-patch and STL meshing (Compounds)" reference section on gmsh website (see the bottom of the page).

> What will it be capable of, and what is the approximate timeline for it?
> 

It will be in Gmsh 4.0 - hopefully within the next couple of months. Gmsh 4.0 will bring many new features : a stable C++/C/Python API, a new efficient mesh file format (MSH4), a  much faster mesh partitioning interface, improved OpenCASCADE integration, ...

Christophe

> 
> — 
> Johannes Töger
> 
> Postdoctoral Research Scholar
> National 7T Facility, Lund Biomedical Imaging Center
> Department of Clinical Sciences Lund, Diagnostic Radiology
> Lund University, Sweden
> 
> On Mon, Feb 12, 2018 at 9:41 PM, Christophe Geuzaine <cgeuzaine at uliege.be <mailto:cgeuzaine at uliege.be>> wrote:
> 
> 
>> On 12 Feb 2018, at 15:42, Juan E. Sanchez <juan.e.sanchez at gmail.com <mailto:juan.e.sanchez at gmail.com>> wrote:
>> 
>> Hello,
>> 
>> Unfortunately, I do not have the geometrical description.  Is there a way to convert the mesh to a geometrical description?
>> 
> 
> No ; we are working on a new implementation of our “reparametrization” algorithm, which will allow you to do some of this, but it’s not ready yet...
> 
> 
>> Regards,
>> 
>> Juan
>> 
>> On 2/12/18 1:21 AM, Christophe Geuzaine wrote:
>>>> On 10 Feb 2018, at 22:06, Juan E. Sanchez <juan.e.sanchez at gmail.com <mailto:juan.e.sanchez at gmail.com> <mailto:juan.e.sanchez at gmail.com <mailto:juan.e.sanchez at gmail.com>>> wrote:
>>>> 
>>>> Hello,
>>>> 
>>>> I have an existing msh file, and a pos file containing a background mesh.  Is there a script example showing how to use these files to create a refined mesh using the background field?
>>>> 
>>> Start from the geometrical description (not the mesh): this way Gmsh will be able to place the new vertices correctly, i.e. on the CAD
>>> gmsh -3 test.geo -bgm test.pos
>>> CG
>>>> Using
>>>> 
>>>> gmsh -3 test.msh -bgm test.pos
>>>> 
>>>> results in a mesh where there is the same number of nodes and elements, but it appears that the physical entity number is lost:
>>>> 
>>>> last element in original file:
>>>> 
>>>> 36210 4 3 15 15 0 5786 5791 5792 5800
>>>> 
>>>> last element in new file:
>>>> 
>>>> 36210 4 2 0 15 2603 5822 2604 2605
>>>> 
>>>> Now all of the mesh elements belong to the same physical entity, 0.
>>>> 
>>>> If I perform a "refine by splitting" in the gui, the physical entity information is maintained:
>>>> 
>>>> 266256 4 2 15 15 42825 10009 41452 9710
>>>> 
>>>> The file is a 3d tetrahedral mesh, and it also contains triangular surfaces to impose boundary conditions.
>>>> 
>>>> Regards,
>>>> 
>>>> Juan
>>>> 
>>>> 
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>>> —
>>> Prof. Christophe Geuzaine
>>> University of Liege, Electrical Engineering and Computer Science
>>> http://www.montefiore.ulg.ac.be/~geuzaine <http://www.montefiore.ulg.ac.be/~geuzaine>
>>> Free software: http://gmsh.info <http://gmsh.info/> | http://getdp.info <http://getdp.info/> | http://onelab.info <http://onelab.info/>
>> 
>> 
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> 
> — 
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science 
> http://www.montefiore.ulg.ac.be/~geuzaine <http://www.montefiore.ulg.ac.be/~geuzaine>
> 
> Free software: http://gmsh.info <http://gmsh.info/> | http://getdp.info <http://getdp.info/> | http://onelab.info <http://onelab.info/>
> 
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> 
> 

— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Free software: http://gmsh.info | http://getdp.info | http://onelab.info

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