CGAL users discussion list

[Peter Hachenberger <>]

On Wed, 2007-05-02 at 15:06 +0200, olivier stab wrote:
> Hi Peter,
> 
> Thank you for your quick answer.
> 
> Peter Hachenberger a écrit :
> > Hi Olivier,
> >
> > On Wed, 2007-05-02 at 11:38 +0200, olivier stab wrote:
> >   
> >> Hello everybody,
> >>
> >> I first want to thanks all the CGAL developers : my program which use 
> >> CGAL 3d nef module begins to give the result I expected :-). But... I 
> >> still have 2 questions :
> >>
> >> 1) In the binary operation between two 3d nef polyhedrons :
> >> During execution, just at the end of the function "binary_operation" 
> >> (Line 1245 in SNC_decorator.h)  the assertion "sim.simplify" is 
> >> (sometime) not true and the program ends !
> >> I would like to know if somebody already had this problem...
> >> What mean the assertion "simplify" (I didn't find an explanation in the 
> >> CGAL documentation) ?
> >>     
> >
> > Actually, this assertion should not occur. Probably, you are not doing
> > wrong, here. Can you send me the files that cause the problem and tell
> > me which binary operation you apply on them and which Kernel you use.
> > Then I try to find the error.
> >   
> I am using Simple_cartesian/Gmpq kernel.
> As I am writing this Email, I am modifying my code to save (in ascii 
> files) the 2 nefs that cause the problem. But as I am using such a 
> Kernel the 2 files may be heavy. It's probably better not to send it to 
> everybody in the cgal-discuss list... If you aggree, I'll send them to 
> you directly at you email adress at Eindhoven University. Just tell me...

I guess you need a cartesian kernel, but I must tell you, that Nef_3
runs much faster with a Homogeneous kernel. With the next release, you
can use filtering with Nef_3. Then the efficiency of the cartesian
kernel will be much better.

Just send the files to my eindhoven address. That's OK.

 
> Do you think it will be in the next release of CGAL ?
> Thanks.

No, the next release is too close.