CGAL users discussion list

["Max" <>]

>> I know nothing about indexed item before. But it works quite well.
>
>That's good to know. Than there is an alternative to
>Exact_construction_excat_predicate_kernel. I'm curious about the
>performance.

I've tried with both Exact_predicates_exact_constructions_kernel and
Exact_predicates_inexact_constructions_kernel, with CGAL::SNC_indexed_items,
but neither even passed compile (on VS2003/SP1 or VS2005/SP1).

>
>> One more question, the program output 'Constructor not available for this 
>> Kernel'
>> What does it mean? Could this message be ignored?
>
>This means that you called the constructor for creating a halfspace
>while you use a standard kernel. This constructor has can not work
>without an extended kernel.

Yes, after a deeper look, I realized that this message was issued by
a statement

Nef_polyhedron_3 N1(pl, Nef_polyhedron_3::INCLUDED);

with
typedef CGAL::Homogeneous<CGAL::Gmpzf>  Kernel;
typedef CGAL::Nef_polyhedron_3<Kernel, CGAL::SNC_indexed_items> 
Nef_polyhedron_3;

Yes, I just noticed the fact that all examples in the manual that use Nef_3
constructor this way are all using the extended kernel.

1) I changed the kernel from Homogeneous<CGAL::Gmpzf> to 
Extended_homogeneous<CGAL::Gmpzf>
and had another run. But this time I got a runtime error. It happened in the 
main program 
at this statement:

        Nef_polyhedron_3 N(P);

2) Despite of this problem, I recommend you add an explicit statement into 
the doc
regarding this requirement/restriction (if there was not). :-)

>
>Peter
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