CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

It prevents the AABB-tree from selection a face as closest (the centroid
of a face being close to that face).
See the class definition at the top of the file for more details.

Sebastien.

On 05/17/2016 10:59 AM, 刘川 wrote:
> Thank you for replying me.
> Since I'm a beginner to CGAL, I don't really understand what does
> SkipPrimitiveFunctor mean and how to create or use it.
> Could you please give me some more instructions?
> ------------------ Original ------------------
> *From: * "Sebastien Loriot 
> (GeometryFactory)"<>;
> *Date: * Tue, May 17, 2016 04:11 PM
> *To: * 
> "cgal-discuss"<>;
> *Subject: * Re: [cgal-discuss] How to compute SDF values upon vertices
> withCGAL
> There is not official way to do it.
>
> If you dig into CGAL/internal/Surface_mesh_segmentation/SDF_calculation.h
>
> you'll see the function calculate_sdf_value_of_facet
> that computes the centroid of the face and then call
> calculate_sdf_value_of_point.
> You'll need to provide a custom SkipPrimitiveFunctor so that
> all faces incident to the vertex you consider are ignored
> in the ray/segment-shooting
>
> Sebastien.
>
> On 05/17/2016 09:27 AM, 刘川 wrote:
>  > Hi!
>  >
>  > I'm using CGAL to compute sdf values of a 3D shape according to
>  > sdf_values_example
>  >
> <http://doc.cgal.org/latest/Surface_mesh_segmentation/Surface_mesh_segmentation_2sdf_values_example_8cpp-example.html>
>  >
>  > The code show me how to compute the sdf value of each facet of the mesh.
>  > But I want to get the sdf value on each vertex. Namely, the axis of the
>  > cone is the opposite of the normal of a vertex.
>  >
>  > I wonder if there is anyway to compute sdf on vertices rather than
> facets?
>  >
>  > Thanks a lot!
>  >
>  > Lau
>  >
>
>
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