CGAL users discussion list

[Guillaume Caron <>]

Yes, I still have the same problem/error.

Guillaume.

Le 16/05/2013 12:02, Sebastien Loriot (GeometryFactory) a écrit :
> On 05/16/2013 11:56 AM, Guillaume Caron wrote:
> > Ok, thank you for the answer but as I said I have the same problem with
> > the predefined kernel CGAL::Exact_predicates_exact_constructions_kernel.
> >
> > And if I understood correctly,
> > CGAL::Exact_predicates_exact_constructions_kernel is equal to:
> > CGAL::Cartesian<CGAL::Lazy_exact_nt<CGAL::Quotient<CGAL:Gmpz>>>.
> No, it is something like Lazy_kernel< Simple_cartesian< CGAL::Gmpq >, 
> ... > for which a specialization is available.
>
> Do you still have the problem?
>
> Sebastien.
>
> > So if the problem is a specialization of an internal writer missing for
> > a kernel using Lazy_exact_nt, the predefined kernel can not work either,
> > no?
> >
> > Guillaume.
> >
> >
> > Le 16/05/2013 11:38, Sebastien Loriot (GeometryFactory) a écrit :
> > > There is a specialization of an internal writer missing for a kernel
> > > using Lazy_exact_nt as number type.
> > >
> > > If it is OK for you, use
> > > CGAL::Exact_predicates_exact_constructions_kernel as "kernel".
> > >
> > > I'll try to fix this for the next release of CGAL.
> > >
> > > Sebastien.
> > >
> > > On 05/15/2013 03:51 PM, Guillaume C wrote:
> > > > Hi,
> > > >
> > > > I'm new to CGAL, and i try to write a Nef_polyhedron in a nef file
> > > > and read
> > > > it after. But i have an error when i use lazy_exact_nt or predefined
> > > > kernels.
> > > >
> > > > My program:
> > > >
> > > > /
> > > > typedef CGAL::Lazy_exact_nt< CGAL::Gmpq> FT_t;
> > > > typedef CGAL::Cartesian< FT_t> kernel;
> > > > typedef CGAL::Nef_polyhedron_3< kernel> Nef_polyhedron;
> > > > typedef CGAL::Polyhedron_3< kernel> Polyhedron;
> > > > typedef Polyhedron::Point_3 Point;
> > > >
> > > >
> > > >
> > > > int main()
> > > > {
> > > >
> > > > Point p(sqrt(2), 0, 0);
> > > > Point q( 0,sqrt(2), 0);
> > > > Point r( 0, 0,sqrt(2));
> > > > Point s( 0, 0, 0);
> > > >
> > > > Nef_polyhedron Cube,Cube2;
> > > > Polyhedron P;
> > > > P.make_tetrahedron( p, q, r, s);
> > > > Cube=P;
> > > >
> > > > std::ofstream out ("temp.nef");
> > > > out<< Cube;
> > > >
> > > > std::ifstream in ("temp.nef");
> > > > in>> Cube;
> > > >
> > > > return 0;
> > > > }/
> > > >
> > > > And the error:
> > > >
> > > > /terminate called after throwing an instance of
> > > > 'CGAL::Assertion_exception'
> > > > what(): CGAL ERROR: assertion violation!
> > > > File: /home/ostab/PACKAGE/CGAL-3.9/include/CGAL/Nef_3/SNC_io_parser.h
> > > > Line: 1368
> > > > Explanation: SNC_io_parser::read: error in node line
> > > > Abandon/
> > > >
> > > > Thank you.
> > > >
> > > >
> > > >
> > > > --
> > > > View this message in context:
> > > > http://cgal-discuss.949826.n4.nabble.com/Problem-to-write-read-nef-file-tp4657449.html 
> > > >
> > > >
> > > > Sent from the cgal-discuss mailing list archive at Nabble.com.