CGAL users discussion list

[Jonas Wallin <>]

Hello,

Yes I have look at those pages for 2D but a few things are unclear to me. 

It says

"the indices of its vertices and the non combinatorial information (if any) in this face"
what I don't understand is what is the non combinatorial information? 

Because if I have a triangulation with say indexes on the vertices and I would like to have that information passed into

cgal through the operator <<(). This seems possible if I interpret the documentation correctly but to me it is not clear how to do it. 

If I would known that the vertices are stored in the same order that they are read from the file it would be easy to have a separate

file with the data read into the program. But I don't see it written any where that this is the case and esthetically that solution dosn't look good to me.

mvh

Jonas

Hej Jonas,

That makes sense. So, did you have a look at these pages yet?
for 3D:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Triangulation_3_ref/Class_Triangulation_3.html
for 2D:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Triangulation_2_ref/Class_Triangulation_2.html
(from your mails I couldn't tell whether you are working in 2D or 3D, although I suspect 2D)

On both of these pages at the very end you see that both operator<<() and operator>>() are overloaded in CGAL to act on a triangulation and the format is explicitly explained. Since you already have the full triangulation in some format, I'm guessing it shouldn't be to hard too convert that into 'CGAL-formatting', allowing you to directly read the triangulation into CGAL triangulation object using the extraction operator, operator>>().

Sincerely,
Jakob

   Hej Jonas,

   Maybe a bit silly.....if you have the tessellation already, why use CGAL to recalculate the same tessellation?

   Greetsz, Jakob

   [..]


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