CGAL users discussion list

["Eivind LM" <>]

On Fri, 13 Jul 2007 17:33:51 +0200, Mariette Yvinec  
<> wrote:

> Eivind LM wrote:
>
> > On Tue, 10 Jul 2007 18:08:17 +0200, Mariette Yvinec   
> > <> wrote:
> >
> > [...]
> >
> > > I got the same error on my computer.
> > > This failure comes from a numerical problem  since it disappears if  
> > > you  replace,
> > > in both the include and typedef line :
> > >
> > > Exact_predicates_inexact_constructions_kernel
> > > by
> > > Exact_predicates_exact_constructions_kernel
> > >
> > > Obviously this Delaunay triangulation should not require
> > > a kernel with exact constructions. The problem
> > > is that, as it is coded now, the predicates are not exact
> > > when the kernel are instantiated with   
> > > Exact_predicates_inexact_constructions_kernel.
> > > Thanks for reporting the bug.
> >
> >
> > Dear Mariette,
> > thank you for your prompt reply. Using   
> > Exact_predicates_exact_constructions_kernel solved the problem in the   
> > testcase as well as in my application.
> >
> > Best regards,
> > Eivind LM
> ok, but Exact_predicates_exact_constructions_kernel  is a kind of  
> overkill in this case
> because you need only exact predicates and no exact constructions.
> There is perhaps  a more efficient way to get exact predicates for  
> terrains.

Well, my application is so far only written as an attempt to learn CGAL,  
so efficiency is not yet a problem. So perhaps the bug in the  
Exact_predicates_inexact_constructions_kernel is fixed by the time I start  
optimizing for performance :)

But in any case I would be interested to hear if anyone knows a way to get  
exact predicates for terrains (without exact constructions).

Thanks again,
Eivind