CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

ZHAO Junqiao (John) wrote:
> Dear Sebastien,
>
> Thanks very much for your efforts.
>
> I discovered that Polyhedron_3::is_valid(true, x) will always produce NOT
> VALID. When x is larger than 1.
I just realize that a call to Polyhedron_3::normalize_border() is needed
for is_valid test when level is greater than 0.

S.

> In line 143 of HalfedgeDS_const_decorator.h, each time when the iteration is
> finished, e will be equal to hds->halfedges_end(). However, the address of
> the e is not NULL, which will not be equal to the address of
> hds->border_halfedges_begin(). 
>
> It is also interesting that neither correct.off and error.off could pass the
> is_valid (, x) check (where x >0), but they do pass the is_closed () check.
> So it's still not clear to me what are the causes of the problem.
>
> I will do further investigation too.
>
> Wishes,
>
> John 
>
> -----Original Message-----
> From: Sebastien Loriot (GeometryFactory) [mailto:] 
> Sent: Friday, May 27, 2011 8:45 PM
> To: 
>
> Subject: Re: [cgal-discuss] Assertion of Minkowski_sum_3
>
> Sorry for the late answer,
>
> I am working on a issue I though was similar to your
> but one problem I have with correct.off and error.off is
> that if I call the Polyhedron_3 method is_valid(true,4), then
> it tells me that the polyhedron is not valid.
>
> If I try loading the Nef_polyhedron using the function
> OFF_to_nef_3, then the Nef_polyhedron I have is open and
> so the minkowski sum cannot be done.
>
> S.