[Gmsh] Creation of simple surface mesh

[Florian Lindner]

Hi Christophe,

thanks for your help! I have compiled gmsh from git to try it.

I am able to successfully remesh (double click on viewport -> change Global Mesh Size Factor), then click Mesh -> 2D to remesh.

Some questions:

* How can I change the meshing algorithm?

* Is there a way to achieve a smiliar semi-automatic meshing on the STL file of the bunny? Or is underlying parametrization you provided required?

Thanks a lot!
Florian

Am 29.05.19 um 16:07 schrieb Christophe Geuzaine:
> 
> Hi Florian,
> 
> This is a nice test-case for our new remeshing pipeline. It's still quite experimental, but you can give it a try with the latest development snapshot: just open the attached .msh file, which contains a mesh of the bunny as well as an underlying parametrization. You can remesh this file simply by selecting the algorithm ("Frontal-Delaunay" in the attached picture) and the mesh size you want (e.g. by double-clicking in the window and changing the global mesh size factor).
> 
> Nothing about the new remeshing features is documented yet, but feel free to play around with it and report your findings ;-)
> 
> Christophe
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>> On 29 May 2019, at 15:25, Florian Lindner <mailinglists at xgm.de> wrote:
>>
>> Hello,
>>
>> I have an existing surface geometry, which is the Stanford bunny [1] as PLY format.
>>
>> My goal is too evaluate a mapping algorithm on a non-trivial geometry. The algorithm works only on point data, therefore I don't need an triangulation.
>>
>> From the existing surface data I want to generate sampled points of various densities on the surface of the geometry and save these as a standard data format (e.g. VTK).
>>
>> As I want to generate different mesh sizes, I need something like a background mesh size or a characteristic length which controls the sampling frequency. The exact placement of the points is not important, it should "make sense", i.e. be roughly equidistant or maybe influenced by the curvature.
>>
>> So far I have only Merge "bun_zipper.ply"; in my .geo file. 
>>
>> I think you can feel, that I am very uncertain how to progress and I would be very happy for guidance!
>>
>> Thanks!
>> Florian
>>
>>
>> [1] http://graphics.stanford.edu/pub/3Dscanrep/bunny.tar.gz
>>
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> 
> — 
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science 
> http://www.montefiore.ulg.ac.be/~geuzaine
> 
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