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Re: [cgal-discuss] hybrid 3D surface mesh generation


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  • From: Andreas Fabri <>
  • To:
  • Subject: Re: [cgal-discuss] hybrid 3D surface mesh generation
  • Date: Tue, 8 Sep 2020 08:39:19 +0200
  • Authentication-results: mail3-smtp-sop.national.inria.fr; spf=None ; spf=None ; spf=None
  • Ironport-phdr: 9a23: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

Hi Kim,


The surface mesher is essentially a volume mesher without quality constraints on tetrahedra.
So it won't be faster. 


Best regards,

Andreas


On 9/8/2020 8:13 AM, "F.A. Perez" ( via cgal-discuss Mailing List) wrote:
Dear Sebastien,
Thanks for the reply! I did consider this option but would this not still mean higer meshing times and memory use since I am still essentialy creating a volume mesh, albeit neglecting the quality of the inside mesh. Given that I expect meshing times to be in the order of days sometimes and with high memory use (especially if creating a volume mesh in the process) my hope was I could use the faster and less resource intensive 3d Surface mesher somehow. I am aware for speed I can go for parallel but the memory issue would remain. Or is the difference in memory use rather limited?

Regards, Kim

From: on behalf of "Sebastien Loriot (GeometryFactory)"
Sent: Monday, September 7, 2020 6:53 AM
To:
Subject: Re: [cgal-discuss] hybrid 3D surface mesh generation
 
You can use the 3D mesher for that purpose. You can simply remove any
criteria on the tetrahedra and use
CGAL::facets_in_complex_3_to_triangle_mesh() to extract the surface facets:

https://doc.cgal.org/latest/Mesh_3/group__PkgMesh3Functions.html#ga68ca38989087644fb6b893eb566be9ea

Best,

Sebastien.

On 9/6/20 10:12 PM, "F.A. Perez" ( via
cgal-discuss Mailing List) wrote:
> Dear CGAL developers,
>
> I would like to use the 3D surface mesh generation capabilities of CGAL
> in a mode similar to the hybrid mode of the 3D mesh generator (i.e. use
> both an implicit domain and a polyhedral domain) but could not find
> anything about this being posible. Is there any way of achiving with the
> 3D surface mesher? The reason is I would like to provide a geometry
> given by a polyhedral domain with an infill given by an implicit domain.
>
> Kind regards,
> Kim
>
>
>
> --
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-- 
Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project

phone: +33.492.954.912    skype: andreas.fabri



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