CGAL users discussion list

[Laurent Saboret <>]

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