CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

In this particular scenario, something that is working
(I just tried it in the Polyhedron demo and it worked for example.off).

Load you mesh as a polygon soup in order to call
orient_polygon_soup:
http://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__orientation__grp.html#gaadc5bac3072b11d2313e40043c729d0a

It will duplicate vertices where there are some non-manifold issues.

Then create the polyhedron using polygon_soup_to_polygon_mesh:
http://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__repairing__grp.html#gac8fe80db9800265922ce469c36d97baa

Then select all self-intersecting faces:
http://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__intersection__grp.html#ga0afb9e365a2f16f0591255b8df468885
are remove those faces.

Fill the hole created:
http://doc.cgal.org/latest/Polygon_mesh_processing/group__hole__filling__grp.html#ga4aacaa46c800a53ca0a0e5fd518a7b20

The tricky part here is to have holes which have the topology of
circles.

Sebastien.




On 06/27/2017 02:29 PM, Joan Hensen wrote:
> Thank you for your responses. Does CGAL provide functionality to fix
> these mesh issues?
>
> ------------------------------------------------------------------------
> *Von:* 
>
>  
> <>
>  im
> Auftrag von Sebastien Loriot (GeometryFactory) 
> <>
> *Gesendet:* Dienstag, 27. Juni 2017 13:56:25
> *An:* 
>
> *Betreff:* Re: [cgal-discuss] Polysurf does not load my .off files
> correctly
>
> On 06/27/2017 01:53 PM, Andreas Fabri wrote:
> > It must be a two-manifold, that is not more than two faces
> > sharing an edge.
>
> + you have some pinched vertices (at least 2 umbrella of faces around
> some vertices)
>
> > andreas
> >
> > On 27/06/2017 13:51, Joan Hensen wrote:
> > > Dear community,
> > >
> > >
> > > I have several meshes given as .off files, which I would like to load in
> > > the following way:
> > >
> > >
> > > PolyhedralSurf P;
> > >
> > > std::ifstream stream(if_name.c_str());
> > >
> > > stream >> P;
> > >
> > >
> > > But neither vertices nor facets are loaded.
> > >
> > >
> > > Please check this
> > > ( https://www.dropbox.com/s/2dkt0idgzdy1atq/example.off?dl=0 ) example
> > > file out the attached file and tell me what I could do, please.
> > >
> > >
> > > Best,
> > >
> > >
> > > Joan
>
>
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