CGAL users discussion list

[Sebastien Loriot <>]

On 10/7/21 5:17 PM, JP HARMAND ( via cgal-discuss Mailing 
List) wrote:
> Hi Seb
>
> What do you mean by “Extended Kernel” ?
> Something not available in CGAL ? Or something requiring special licence ?

It is described here:
https://doc.cgal.org/latest/Nef_3/index.html#title2

Best,

Sebastien.

> RGDS
> JPH
>
> Le 7 oct. 2021 à 17:11, Sebastien Loriot ( 
> <> via cgal-discuss Mailing List) 
> < <>> a écrit :
>
> It is possible but requires an extended Kernel.
>
> Note that there exists an alternative implementation (more modern and 
> faster) in the Polygon Mesh Processing package
>
> See the clip function:
>
> https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__corefinement__grp.html#ga5bf228a516a46f6d1c80937067a17f7e 
> <https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__corefinement__grp.html#ga5bf228a516a46f6d1c80937067a17f7e>
>
> Best,
>
> Sebastien.
>
> On 10/7/21 4:50 PM, "" ( via cgal-discuss 
> Mailing List) wrote:
> > now exploring Nef polyhedra boolean capabilities.
> > As far as i understand Nef polyhedra can represent open half spaces.
> > Hoping that i could obtain a result in boolean subtract operation 
> > between a single face and a volume
> > i modified the sample code supplied in the manual in various ways.
> > Last one was as below where   fill_cube_1 represents a single face and 
> > fill_cube_2 represent the piercing cube
> > . The result is empty.
> > Is this a possible operation with nef ?
> > Best regards
> > JPH
> > voidfill_cube_1(Polyhedron& poly)
> > {// single plane
> > std::string input =
> > "OFF\n\
> > 4 1 0\n\
> > -1 -1 0\n\
> > -1 1 0\n\
> > 1 1 0\n\
> > 1 -1 0\n\
> > 4  0 1 2 3";
> > std::stringstreamss;
> >   ss << input;
> >   ss >> poly;
> > }
> > voidfill_cube_2(Polyhedron& poly)
> > {
> > std::string input =
> > "OFF\n\
> > 8 12 0\n\
> > -0.5 -0.5 -0.5\n\
> > -0.5 0.5 -0.5\n\
> > 0.5 0.5 -0.5\n\
> > 0.5 -0.5 -0.5\n\
> > -0.5 -0.5 0.5\n\
> > -0.5 0.5 0.5\n\
> > 0.5 0.5 0.5\n\
> > 0.5 -0.5 0.5\n\
> > 3  0 1 3\n\
> > 3  3 1 2\n\
> > 3  0 4 1\n\
> > 3  1 4 5\n\
> > 3  3 2 7\n\
> > 3  7 2 6\n\
> > 3  4 0 3\n\
> > 3  7 4 3\n\
> > 3  6 4 7\n\
> > 3  6 5 4\n\
> > 3  1 5 6\n\
> > 3  2 1 6";
> > std::stringstreamss;
> >     ss << input;
> >     ss >> poly;
> >   }
> > --
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