CGAL users discussion list

[Sebastien Loriot <>]

What is the diff between what doesn't work and what does?

Sebastien.

On 5/7/22 00:05, Bob Bill ( via cgal-discuss Mailing 
List) wrote:
> 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 
> <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 
>  >
>  > 
> <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 ( 
> <>
>  > < <>> 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 
>  >
>  > 
> <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 
>  >
>  > 
> <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 
> < <>
>  > < <>>>
>  >  > 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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