CGAL users discussion list

[Jane Tournois <>]

Hi Hugo,

thanks for your report. I am having a look at it.

Best,

Jane.


Le 06/04/2017 à 11:27, Hugo Ledoux a écrit :
> Greetings,
>
> I have one mesh whose normals are pointing outwards, but the function
> CGAL::Polygon_mesh_processing::is_outward_oriented() returns
> otherwise.
>
> I have checked the code and the average of the normals of the faces
> incident to the min-vertex is used, which conceptually I doubt should
> work… And it doesn’t work in my case (unless I made a mistake
> somewhere), you can download my OFF file, along with the code I used,
> there:
> https://www.dropbox.com/sh/49as9yt139v6kxk/AABXI3Nh4ZfqCEDWHyv8Q-Zja?dl=0
>
> If other ways to compute the normal were used (eg by using the area of
> the face as a weight), then the x-component of the vector could be
> negative (as is used by cgal), but I am wondering if that would always
> work. I think not.
>
> Any comments appreciated, cheers,
> Hugo Ledoux

--
Jane Tournois, PhD
R&D Engineer at GeometryFactory
http://www.geometryfactory.com/