CGAL users discussion list

[Ianic <>]

I wouldn't know what to do here. Also I am not sure how you calculate the
direction of a facet but I can give you a word of warning - when I saved the
3d mesh as medit .mesh file with CGAL, the facet directions were random. I
had to edit the File_medit_IO.h (or smth like that, don't remember its name
now) such that the facet norms were consistent - all pointing outside the
meshed domain.


mparusinski wrote:
> 
> Did you get any problem regarding identifying the direction of each
> facets. I am trying to see for each facet if it is pointing towards x
> positive, x negative, y positive, y negative, z positive or z
> negative, using normals to facets. Identifying the x,y and z direction
> is fine, however identifying the positive and negative bit is quite
> vulnerable to floating point arithmetic imprecision. I rely on using
> the normal to a facet and the tetrahedra it is on. Any advice on that?
> 
> On 1 September 2010 23:34, Ianic 
> <>
>  wrote:
>>
>> Check the bottom of this thread:
>>
>> http://cgal-discuss.949826.n4.nabble.com/Neighbours-list-in-3D-meshing-td2075323.html#a2132298
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