CGAL users discussion list

[Thibault Marzais <>]

Thank you Laurent. That's all I needed to know.

Laurent Saboret a écrit :
> Dear Thibault,
>
> You are right, the Square_border_parameterizer_3 class (and the 
> derivates) do not allow you to specify your preferred corner vertices.
>
> For this purpose, you must provide your own model of 
> BorderParameterizer_3
> (http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Surface_mesh_parameterization_ref/Concept_BorderParameterizer_3.html) 
>
> In your case, the Square_border_parameterizer_3 class should be a good 
> starting point.
> Basically, you have to implement a "parameterize_border(Adaptor& 
> mesh)" method that maps border vertices to [0.0, 4.0[, with your 
> preferred corner vertices corresponding to e.g. 0.0, 1.0, 2.0 and 3.0.
>
> To find the Border_vertex_iterator of your preferred corner vertices, 
> you may simply iterate over all border vertices and select the 
> vertices based on their index. As in your case the first four vertices 
> in the OFF are the corners, their index should be 0, 1, 2, and 3.
>
> Best regards,
>
> Laurent Saboret
> INRIA Sophia-Antipolis
>
>
> Thibault Marzais wrote:
> > Hi all,
> >
> > I'd like to parameterize a mesh (off file). I know the 
> > Square_border_parameterizer_3 class (and the derivates), I had 
> > already read the chapter 39.3 in documentation. I used the 
> > Simple_parameterization.cpp file to do so, it works fine, but takes 
> > wrong vertices for corners. So I decide to write my own 
> > Square_border_parameterizer_3 class and my own parameterize_border 
> > method.
> >
> > The problem is that I know the vertices that are perfect corners for 
> > parameterization, but I can't find any way to determine their 
> > Border_vertex_iterator. In fact, the only information I have is the 
> > off file and the first four vertices are the corners.
> >
> > Is there any file/link/cheat I missed?
> > If not, can you suggest a method?
> >
> > Thanks in advance.
> >
> > Thibault Marzais


--
Thibault Marzais, 
Doctorant au LAIC,
Laboratoire d'Algorithmique et Image de Clermont-Ferrand,
IUT Département Informatique, bureau C4
BP 86 63172 Aubiere cedex France.
tel: +33 (0)4 73 17 71 47
http://laic.u-clermont1.fr/~marzais/