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- From: "Laurent Rineau (GeometryFactory)" <>
- To:
- Subject: Re: [cgal-discuss] CGAL Demo Stats
- Date: Wed, 8 Jun 2011 15:46:01 +0200
- Organization: GeometryFactory
On mercredi 08 juin 2011 15:31:24 Fabio Casado Ruiz wrote:
> On 6/8/2011 1:20 AM, Andreas Fabri wrote:
> > On 06/06/2011 04:17, Fabio Casado Ruiz wrote:
> >> Hi everyone, I'm trying to make some comparisons between meshes
> >> generated using both TetGen as CGAL. Tetgen statistics for generated
> >> meshes are pretty detailed, but for CGAL (and I must admit that
> >> because of time issued I'm only using the Mesh_3 demo) there are a
> >> few statistics I dont comprehend fully. Is there a place where the
> >> demo, its way of functioning and statistics are explained? I'm
> >> interested in facet angles (this are the angles of superficial faces
> >> right?), the dihedral angle (these are showned in the diagram at the
> >> bottom of the window right?) and the tet. max size (does this size
> >> refer to tetrahedral volumes?).
> >>
> >> Another issue is the aspect (visually) of final meshes. I've
> >> generated a couple, and when I look at them I can see places where
> >> the original borders are not included (see example pictures). Is this
> >> because CGAL doesnt conform to boundaries????
> >
> > Hi Fabio,
> >
> > Did you run the demo that comes with CGAL to produce this mesh?
> > There the sharp edges should appear nicely, as the demo first
> > detects sharp features and then passes the polyline describing
> > them to the mesh generation function.
> >
> > http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_mai
> > n.html#Subsection_49.3.5
> >
> >
> > andreas
> >
> >> Please I would appretiate your help a lot . Thanks again, Fabio.
>
> yes, im using the CGAL demo. de model is actually really simple, im
> attaching it. i mesh with the same parameters the demo suggests. im
> using cgal3.8 (beta1). i include again the image file showing how the
> final mesh doesnt conform to the boundary lines. can u help? i wanted to
> show two meshes, one done in tetgen and one done in cgal, and i always
> expected cgal's to be better (even do it would be generated in a little
> extra time).
CGAL Mesh_3 demo has not been updated after the new version of Mesh_3 that is
in CGAL-3.8. Whereas the package, in CGAL-3.8, can mesh a that has sharp
edges, the code that is used in the demo can only mesh a smooth polyhedron
(that means it does not respect sharp edges if the polyhedron is not smooth).
Have a look at the examples examples/Mesh_3/. There are several examples that
show how to mesh a polyhedron that have sharp edges.
--
Laurent Rineau, PhD
R&D Engineer at GeometryFactory http://www.geometryfactory.com/
Release Manager of the CGAL Project http://www.cgal.org/
- [cgal-discuss] CGAL Demo Stats, Fabio Casado Ruiz, 06/06/2011
- Re: [cgal-discuss] CGAL Demo Stats, Mariette Yvinec, 06/07/2011
- Re: [cgal-discuss] CGAL Demo Stats, Fabio Casado Ruiz, 06/08/2011
- Re: [cgal-discuss] CGAL Demo Stats, Andreas Fabri, 06/08/2011
- Re: [cgal-discuss] CGAL Demo Stats, Fabio Casado Ruiz, 06/08/2011
- Re: [cgal-discuss] CGAL Demo Stats, Laurent Rineau (GeometryFactory), 06/08/2011
- Re: [cgal-discuss] CGAL Demo Stats, Fabio Casado Ruiz, 06/08/2011
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