CGAL users discussion list

[Jane Tournois <>]

The normal computed at the minimal vertex p connects these points
p        = 93748.5625 463832.4375 0
p + n = 93748.69634598933 463831.60433620599 -0.53658488932336901

the normal is correct, but the test is wrong. We will try to fix it asap.

Thanks again,
Jane.

Le 06/04/2017 à 17:35, Jane Tournois a écrit :
> 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/