CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Please provide a small self-contained example showing the pb.
I just gave a try with inserting already inserted constraints
and it worked without issues with the Exact_predicates_tag tag.
Are you sure you are always using this tag?

Sebastien.

On 11/07/2018 10:39 AM, marin wrote:
> Hello,
>
> I have two questions about inserting constraints in
> Constrained_triangulation_plus_2 triangulation.
>
> I'm using triangulation defined like this
>         typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
>         typedef CGAL::Projection_traits_xy_3<K> Gt;
>         typedef CGAL::Triangulation_vertex_base_with_info_2<FaceInfo2, Gt> 
> Vbb;
>         typedef CGAL::Triangulation_hierarchy_vertex_base_2<Vbb> Vb;
>         typedef CGAL::Constrained_triangulation_face_base_2<Gt> Fb_base;
>         typedef CGAL::Triangulation_face_base_with_info_2<FaceInfo2, Gt, 
> Fb_base>
> Fb;
>         typedef CGAL::Triangulation_data_structure_2<Vb, Fb> TDS;
>         typedef CGAL::Exact_predicates_tag Itag;
>         typedef CGAL::Constrained_Delaunay_triangulation_2<Gt, TDS, Itag>
> Delaunay_base;
>         typedef CGAL::Triangulation_hierarchy_2<Delaunay_base> Triangulation;
>         typedef CGAL::Constrained_triangulation_plus_2<Triangulation> 
> Delaunay;
>
> 1. insert_constraint sometimes throws an exception
>         I am using function Constraint_id 
> CGAL::Constrained_triangulation_plus_2<
> Tr >::insert_constraint( PointIterator first, PointIterator last, bool close
> = false )
>         
>         - it throws exception every time if I try to insert the same polyline
> twice.
>         - sometimes it throws exception inserting not already inserted 
> constraints.
>         
>         Since Constrained_triangulation_plus_2 should support any polylines 
> layout
> as constraints including those intersecting each other, please I'm wondering
> what are preconditions for the Insert_constraint function in order to work
> without exception?
>
> 2. In reference manual I've found the function Insert_constraints (plural)
> that allows inserting many polyline constraints at once using optimized
> algorithm with spatial indexes but I haven't found any examples how to use
> it. Please if there are some examples available I would be very grateful.
> insert_constraints ( ConstraintIterator first, ConstraintIterator last )
>
> Thank you very much for answers.
>
> Best regards,
> Marin
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/