CGAL users discussion list

[Stephane Tayeb <>]

 wrote:
> I get the attached effect. The boundaries between the colors are straight and
> smooth, as the function goes, but the meshing is rather jagged. Is that what
> you mean by not preserving features just yet?
>
> Thanks, Amir.

Yes, for example the edge between red and orange will be jagged without 
edge preservation. Our current mesh generation process only provides 
garantees about surface facets and tetrahedra of the mesh.

As I'm not sure to fully understand your problem, let me add this:
concerning the surfaces, did you try to play with the distance bound 
parameter, which controls the approximation error from mesh surface 
facets to the surface of the domain you are meshing ?


> Quoting Stephane Tayeb 
> <>:
>
> > Amir Vaxman wrote:
> > > Hello,
> > >
> > > My input is a volumetric subdivision of the space to which I apply the 3D
> > > mesh generation package. Even if my implicit oracle function (of what
> > > point
> > > has what volume index) is smooth, I still get jagged boundaries between
> > > the
> > > volumes, even for rather fine tet sizes. Is it inevitable, or is there a
> > > fix
> > > to it?
> > >
> > > Thanks, Amir.
> > Hi,
> >
> > Do you mean that the edges or the surfaces between the subdomains are 
> > not smooth ? The surfaces should be smooth, the edges are not. The 
> > current release of CGAL 3D Mesh Generator is designed for smooth 
> > surfaces only, i.e. it does not preserve sharp features (FYI we plan to 
> > release feature preservation later on, maybe in 3.7).
> >
> > --
> > Stephane Tayeb
> > Software engineer - INRIA Sophia Antipolis
> > Geometrica Project-Team


--
Stephane Tayeb
Software engineer - INRIA Sophia Antipolis
Geometrica Project-Team