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[Benjamin schwarz <>]

Hello Omar,

  May the problem be due to the presence of singular facets or
quasi-manifolds (for instance two 3-simplices connected only by a
vertex) ?

   Ben

On Sun, Mar 8, 2009 at 6:48 AM, omar rodriguez
<>
 wrote:
> Hello, sorry if this topic has been covered already, I tried searching
> the archives but they seem to be down at the moment.
>
>
> I am using alpha shapes to get a shape from a set of points, and then
> I convert it to a polyhedron using
> CGAL::Polyhedron_incremental_builder_3 to get the boundary facets to
> perform further operations.
>
> This works most of the time, but every so often I get the following error :
>
> ---
> CGAL::Polyhedron_incremental_builder_3<HDS>::
> add_vertex_to_facet(): input error: disconnected facet complexes at vertex
> 636:
>          involved facets are: 472 470 471 (closed cycle) and.
>
> terminate called after throwing an instance of 'CGAL::Assertion_exception'
>  what():  CGAL ERROR: assertion violation!
> Expr: check_protocoll == 1
> File: ../../CGAL-3.4/include/CGAL/Polyhedron_incremental_builder_3.h
> Line: 224
> ---
>
> I have tried using different kernels but the error keeps popping up on
> the polyhedron builder.
>
> Any help would be greatly appreciated.
>
> Omar
>
> +
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