CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

In the Boolean operation world, what you are looking for is called the
intersection. The only official way to do that for now is to use
the Nef_polyhedron package, and in your case this function:

http://doc.cgal.org/latest/Nef_3/classCGAL_1_1Nef__polyhedron__3.html#a4f7d5c63440b89153cb971e022e0ef76

This example is a good start:
http://doc.cgal.org/latest/Nef_3/Nef_3_2handling_double_coordinates_8cpp-example.html 
for I/O from polyhedron.


Sebastien.


On 04/19/2016 02:26 PM, vertber wrote:
> Hi, I'm kinda new with CGAL and i have a question for you !  (And sorry for
> my bad english,it's not my native language so i'll try my best. )
>
> I have an .off file (a 3D Indoor Room) which is read and stocked into a
> Surface_Mesh Object (couldn't use a Polyhedron cause i've got some error,
> probably because it's not a manifold polyhedron).
> On the other hand I have a pyramidal Polyhedron (which symbolize a camera's
> field of view) and I would like to manage to cut off all the surface mesh
> which is not in this pyramidal Polyhedron.
> With the help of this code
> (https://www.codefull.org/2016/03/cgal-point-in-polyhedron-algorithm/) I
> managed to mark each vertices of my surface_mesh which is not inside the
> polyhedron as removed, and then called the garbage collection in order to
> remove them completely.
> But Surface_Mesh provide only Low-Level Removal Functions, so my
> Surface_mesh result is not valid anymore and I can't write it into a new off
> file.
>
> I can also just keep the Points of my surface mesh which are inside the
> pyramidal Polyhedron and stock them other place, but by doing that the
> result is a Point cloud whereas I would like to obtain a Mesh.
>
> So my question is: Does it exist a way to keep the part of a surface-mesh
> which is inside a Polyhedron ?
>
> Thanks for reading !
>
>
>
> --
> View this message in context: 
> http://cgal-discuss.949826.n4.nabble.com/Only-keep-the-part-of-a-surface-mesh-which-is-inside-a-Polyhedron-tp4661848.html
> Sent from the cgal-discuss mailing list archive at Nabble.com.