CGAL users discussion list

[Bob Bill <>]

Sebastien,

I did just these two small changes to the file linked in GitHub and it worked as expected:

// Domain

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;

typedef CGAL::Surface_mesh<K::Point_3> Mesh;

// Triangulation

typedef CGAL::Polyhedral_mesh_domain_3<Mesh,K> Mesh_domain;

typedef CGAL::Mesh_triangulation_3<Mesh_domain,CGAL::Default,Concurrency_tag>::type Tr;

typedef CGAL::Mesh_complex_3_in_triangulation_3< Tr> C3t3;

In the main.cc I just wrote:

Mesh_domain domain(my_surface_mesh);

 Mesh_criteria criteria(facet_angle=25, facet_size=0.15, facet_distance=0.008,

cell_radius_edge_ratio=3);

// Mesh generation

C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, no_perturb(), no_exude());

and the result is correct. I don't see why it works now, honestly.

Best

Il venerdì 6 maggio 2022, 20:36:31 CEST, Bob Bill" ( via cgal-discuss Mailing List) <> ha scritto:

Sebastien, 

I executed your example from GitHub with several .off files and visualized the result using `output_to_medit` , but the interior is still empty, not filled with tetrahedra like in this picture (https://doc.cgal.org/latest/Mesh_3/index.html#fig__figureimplicit_domain). 

Is this a visualisation bug, or is it expected? It should have tetrahedra inside.

Thanks a lot for your time

Il venerdì 6 maggio 2022, 16:51:54 CEST, Sebastien Loriot" ( via cgal-discuss Mailing List) <> ha scritto:

c3t3 is a 3D mesh. You can use
https://doc.cgal.org/latest/Mesh_3/group__PkgMesh3IOFunctions.html#ga1ca4f403781718f2f4d5c227c89ed496

or any other IO function.

Best,

Sebastien.

On 5/6/22 16:49, Bob Bill ( via cgal-discuss Mailing
List) wrote:
> Thanks for your answers.
> Sebastien, in the example you linked it seems to me that only the
> surface is meshed, right? I also need to fill the interior of the my
> surface_mesh. Is there a way to do that?
>
> Thanks for your time.
> Il venerdì 6 maggio 2022, 15:32:43 CEST, Sebastien Loriot"
> ( via cgal-discuss Mailing List)
> <> ha scritto:
>
>
> You can check this example:
>
> https://github.com/CGAL/cgal/blob/master/Mesh_3/examples/Mesh_3/remesh_polyhedral_surface_sm.cpp
> <https://github.com/CGAL/cgal/blob/master/Mesh_3/examples/Mesh_3/remesh_polyhedral_surface_sm.cpp>
>
> Best,
>
> Sebastien.
>
> On 5/6/22 15:14, Bob Bill (
> <mailto:> via cgal-discuss Mailing
> List) wrote:
>  > I'm still trying to solve this, sorry again. I've seen the make_mesh_3
>  > function
>  >
> (https://doc.cgal.org/latest/Mesh_3/group__PkgMesh3Functions.html#ga1ee73dc372985c6aeef85f2415fac0ba
> <https://doc.cgal.org/latest/Mesh_3/group__PkgMesh3Functions.html#ga1ee73dc372985c6aeef85f2415fac0ba>)
>
>  > but my initial domain is a triangle Surface_mesh, not a Polyhedron as in
>  > the example, so I am still stuck and I need a help or a hint.
>  >
>  > Just to make things clearer, my goal is to create a 3D triangulation
>  > from the Surface_mesh `mesh2` of this basic example program in the
>  > documentation :
>  >
> https://doc.cgal.org/latest/Polygon_mesh_processing/Polygon_mesh_processing_2corefinement_consecutive_bool_op_8cpp-example.html#a5
> <https://doc.cgal.org/latest/Polygon_mesh_processing/Polygon_mesh_processing_2corefinement_consecutive_bool_op_8cpp-example.html#a5>
>  >
>  > Best
>  >
>  > Il venerdì 6 maggio 2022, 01:15:25 CEST, Bob Bill <
> <mailto:>>
>  > ha scritto:
>  >
>  >
>  > Dear all,
>  >
>  > I have a triangulated Surface_mesh (which is the output of a boolean
>  > operation), and now I need to get a 3D triangulation from it, i.e. to
>  > fill it with tetrahedra. I don't see a direct way to do this, so I'd
>  > like to hear from you what your approach would be.
>  >
>  > My first guess was to do just:
>  > // CGAL::Surface_mesh<K> sm
>  > Triangulation tr(s.points().begin(),sm.points().end());
>  >
>  > but I don't know honestly if that's the preferred way. Any hint or
>  > comment is highly appreciated!
>  >
>  > Best regards,
>  > Bob
>  >
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>
>  >
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