CGAL users discussion list

[Richard Downe <>]

I'm not certain, but as far as I can tell (e.g., in my experience), 
NEF_polyhedra require use of an exact kernel.
In my code, I use the Exact_predicates_exact_constructions_kernel for my 
NEF_polyhedra, and then use a polyhedral builder to convert them into 
Polyhedron_3<Exact_predicates_inexact_constructions_kernel> before meshing.
For the conversion, there's a perfectly serviceable class in 
demo/Polyhedron/Scene_nef_polyhedron_item.cpp in the source tree that 
takes as template arguments the source kernel and the destination 
kernel, though if you're not doing anything that requires the inexact 
constructions kernel you may be fine with the EPECK kernel throughout.
--rd

On 08/21/2011 04:53 PM, Garrett Bodily wrote:
> I am attempting to create a simple test case for Nef_Polyhedron but keep
> running into a compile error and am not sure what to try next.
>
> below is my entire program:
>
> /////////////////////// Start of Program /////////////////////////////
> #include&lt;CGAL/Simple_cartesian.h&gt;
> #include&lt;CGAL/Polyhedron_3.h&gt;
> #include&lt;CGAL/Nef_polyhedron_3.h&gt;
>
> typedef CGAL::Simple_cartesian<double>      Kernel;
> typedef CGAL::Nef_polyhedron_3<Kernel>      Nef_polyhedron;
> typedef Nef_polyhedron::Plane_3           Plane_3;
> typedef CGAL::Polyhedron_3<Kernel>          Polyhedron;
> typedef Polyhedron::HalfedgeDS            HalfedgeDS;
> typedef CGAL::Point_3<Kernel>               Point;
>
> #include<iostream>
>
> int main()
> {
>   Point p1(0.0, 0.0, 0.0);
>   Point p2(2.0, 0.0, 0.0);
>   Point p3(1.0, 2.0, 0.0);
>   Point p4(1.0, 1.0, 2.0);
>
>   Polyhedron P1;
>   P1.make_tetrahedron(p1, p2, p3, p4);
>
>
>   Nef_polyhedron N1(P1);
>
>
>   std::cout<<  "Done."<<  std::endl;
>   return 0;
> }
> /////////////////////// End of Program /////////////////////////////
>
> When I try to compile this program i get a compiler error in the header file
> bounding_box_3.h that says that "hi" and "lo" (on lines 89 and 90 of the
> header file) are not members of CGAL::Box_intersection_d::Box_d.
>
> Has anyone run into this error before?
>
> Any suggestions?
>
> Thanks
> Garrett B