CGAL users discussion list

[Peter Hachenberger <>]

Hi,

I'm a bit surprised that you used filtering with Nef_3 in CGAL 3.2.1,
because filtering was not supported for Nef_3 in that CGAL version. Your
implementation must have been terribly slow.

The problem with your program is, that Nef_3 does not work with
MP_Float, since it does not support divisions. You must have installed
CGAL 3.3 without GMP. If you add GMP support, the Exact_..._kernel uses
Gmpq instead of MP_Float and the compilation works.

Peter

On Mon, 2007-08-27 at 14:11 +0900, Wonwoo Lee wrote:
>  
> Hi, CGAL developers and users. 
>  
> I wrote a class which uses Nef_3 boolean operation for the
> exact visual hull reconstruction from silhouette images. 
> My code had no errors with the CGAL 3.2.1, when I built it. 
>  
> However, it causes many compile errors with the file 'lazy_exact_nt.h'
> when I try to compile my code 
> after I updated the CGAL to version 3.3. 
>  
> The errors are about the definition of the operator '/', such as : 
>  
> c:\program files\cgal-3.3\include\cgal\lazy_exact_nt.h(325) : error
> C2784: 'CGAL::Root_of_2<RT_> CGAL::operator /(const
> CGAL::Root_of_2<RT_> &,const CGAL::Root_of_2<RT_> &)' : could not
> deduce template argument for 'const CGAL::Root_of_2<RT_> &' from
> 'CGAL::MP_Float' 
>  
> 1>c:\program files\cgal-3.3\include\cgal\lazy_exact_nt.h(325) : error
> C2784: 'CGAL::Interval_nt<Protected> CGAL::operator /(double,const
> CGAL::Interval_nt<Protected> &)' : could not deduce template argument
> for 'const CGAL::Interval_nt<Protected> &' from 'CGAL::MP_Float'
>  
> Actually, I'm not much familar with the way CGAL works. 
> I referred the demos and examples to develop my code. 
> Anyone can help me ? 
>  
>  
>  
> For more information, I listed header files I'm using. 
>  
> #include <CGAL/Homogeneous.h>
> #include <CGAL/Nef_polyhedron_3.h>
> #include <CGAL/IO/Nef_polyhedron_iostream_3.h>
> // Headers for Polydedron_3
> #include <CGAL/Polyhedron_3.h> 
> #include <CGAL/IO/Polyhedron_iostream.h>
> #include <CGAL/Polyhedron_incremental_builder_3.h> 
> 
> #include <CGAL/Exact_predicates_exact_constructions_kernel.h>
> 
> // typedefs.... 
> typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel; 
> 
> typedef CGAL::Nef_polyhedron_3<Kernel>  Nef_polyhedron_3;
> 
> typedef CGAL::Polyhedron_3<Kernel> Polyhedron_3;
> typedef Polyhedron_3::HalfedgeDS HalfedgeDS;
> typedef Kernel::Point_3  Point_3;
> typedef Kernel::Vector_3 Vector_3 ;
> typedef Kernel::Plane_3  Plane_3;
> typedef Kernel::Line_3  Line_3 ;
> 
> typedef Nef_polyhedron_3::Aff_transformation_3  Aff_transformation_3 ;
> 
> 
> 
>