CGAL users discussion list

[JP HARMAND <>]

Hi Seb

What do you mean by “Extended Kernel” ? 

Something not available in CGAL ? Or something requiring special licence ?

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

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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