CGAL users discussion list

[omar rodriguez <>]

Thanks a lot Ben,

the problem was not in the code I submitted, but rather on the alpha
value I was using computed from the alpha shape's find_optimal_alpha
function. This value apparently allows for the sort of connections you
mentioned. I am now using a slightly larger value and everything is
working fine.

Omar

+



On Tue, Mar 10, 2009 at 12:08 AM, Benjamin schwarz
<>
 wrote:
> I am not a CGAL expert and have no time to dive in your code right now, 
> sorry.
>
> Anyway, I know CGAL polygons are restricted to the construction of
> manifold surfaces, and suspect your problem is somehow connected to a
> non-manifold case. Singular facets are not the only cases of
> non-manifoldness in an alphashape :
> Consider an alphashape made of two 3-simplices (Alpha_shape_3::Cell)
> sharing a single vertex. The surface of this object is not manifold.
>
>  hope this helps
>
>    --Ben
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