CGAL users discussion list

I got it :), thank you so much!

> 
>  wrote:
>> Thank you so much, really! you helped me a lot, and I think I'm very
>> close
>> now :).
>>
>> I have one more question if you don't mind. I noticed that if I change
>> the
>> order of the vertices added to a facet the program will give an error,
>> and
>> I couldn't understand this. For example, in the second facet, if you add
>> the vertices in the order 1-2-3 rather than 1-3-2 (like you did it) the
>> program will crash. Could you please tell me why this happens? I mean
>> I'm
>> going to create random polyhedra with 20 surfaces or more, how will I
>> judge the right order to take?
>
> You have to look at a reference given in the manual page indicated
> (for example DCEL in Mark de Berg, Marc van Kreveld, Mark Overmars, and
> Otfried Schwarzkopf. Computational Geometry: Algorithms and
> Applications. Springer-Verlag, Berlin, 1997. )
>
> The idea is that the way an halfedge is oriented indicates on which side
> of the edge the facet described is. If you look at the picture on the
> manual page, you will see that vertices of a facet must be given
> counter-clockwise.
>
>>
>> Thank you,
>> Regards,
>> Samer Afach
>>
> [snip]
>
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