CGAL users discussion list

[olivier stab <>]

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...
> > 2) How can I convert a Nef_Polyhedron_3 which is not simple (a face has 
> > a hole in it) in a Polyhedron_3 (which I visualize later in VRML format) ?
> > Is there already a simple procedure which do so or do I have to program 
> > an algorithm ( which for example triangulate the non-simple-face ) ?
> >     
>
> We still don't have such a conversion tool. It moved in a high position
> on my agenda, especially since we are just about to finish a new
> triangulation, but I did not do it yet.
>
>   
Do you think it will be in the next release of CGAL ?
Thanks.

> Peter
>
>