CGAL users discussion list

[Laurent Saboret <>]

Dear Defeng,

To complete my previous email:

Your out.off mesh is fine, except that its genus is 3.

CGAL parameterization package comes with a simple cutting algorithm which is 
enough for this mesh.
You may run it e.g. via the "polyhedron_ex_parameterization" example:
> ./polyhedron_ex_parameterization out.off mesh.eps
See the output mesh.eps attached to this email.

Note: "polyhedron_ex_parameterization" has various options to test all features of the 
parameterization package and write the result as OBJ or EPS files.
Try "./polyhedron_ex_parameterization -h" for usage.

Best regards,
Laurent Saboret


Laurent Saboret wrote:
> Dear Defeng,
>
> The error message "FATAL ERROR: Input mesh is not a surface" is printed 
> when parameterize() fails with the error code ERROR_NO_SURFACE_MESH. 
> This specific error code is sent when the input mesh does not enforce: 
> genus = 0, one connected component and at least one border.
>
> The general requirements are given in the documentation:
> http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Surface_mesh_parameterization/Chapter_main.html#Section_39.1 
>
> The package is restricted to "triangulated surfaces which are 
> homeomorphic to a disk", i.e. triangulated meshes, 2-manifold, genus = 
> 0, one connected component and at least one border.
>
> Best regards,
> Laurent Saboret
>
>
> Defeng WANG wrote:
> > Hi, Laurent,
> >
> > Thanks for you reply.
> >
> > I have another question about the sample code 
> > "Mesh_cutting_parameterization". When I put in my mesh, I was told 
> > that "FATAL ERROR: Input mesh is not a surface". For the convenience 
> > to find the problem, I attached the mesh I used. What is the requirent 
> > for the input mesh? How to adjust my mesh to be acceptable for the 
> > sample code?
> >
> > Many thanks!
> > Defeng
> > ----- Original Message ----- From: "Laurent Saboret" 
> > <>
> > To: 
> > <>
> > Sent: Monday, December 03, 2007 9:47 PM
> > Subject: Re: [cgal-discuss] parameterization of genus-3 mesh
> >
> >
> > > Hi Defeng,
> > >
> > > CGAL Surface_mesh_parameterization package
> > > http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Surface_mesh_parameterization/Chapter_main.html 
> > >
> > > can parameterize genus-1 meshes (topological disks).
> > >
> > > This package does not provide any algorithm to transform an arbitrary 
> > > mesh into a topological disk, the user being responsible for 
> > > generating such a cut graph. Nevertheless, we provide a simple 
> > > cutting algorithm for the sake of completeness. See details at 
> > > http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Surface_mesh_parameterization/Chapter_main.html#Section_39.5 
> > >
> > >
> > > Best regards,
> > > --
> > > Laurent Saboret
> > > INRIA Sophia-Antipolis
> > >
> > >
> > > Defeng WANG a écrit :
> > > > Hello, CGALers,
> > > >
> > > > Ask one quick question, if I want to parameterize of a genus-3 mesh, 
> > > > what should I do by using CGAL?
> > > >
> > > > Thanks for any comments.
> > > > Best wishes,
> > > > Defeng