CGAL users discussion list

[Sylvain Pion <>]

Le 23/01/10 10:03, Edoardo Milotti a écrit :
> I use Triangulation_hierarchy_3, and I insert vertices one by one in a
> fixed order: I noticed that the triangulation output is shuffled and the
> order is different every time I run my program. Can anybody please tell
> me how to set the seed of the internal random number generator in order
> to obtain a reproducible output? Thanks.

By "output order", you meant the Cell_iterator order, not
the Vertex_iterator order, right ?

Does the following patch solve your problem ?

--- Triangulation_3.h   (revision 52267)
+++ Triangulation_3.h   (working copy)
@@ -207,7 +207,6 @@
   Tds _tds;
   GT  _gt;
   Vertex_handle infinite; //infinite vertex
-  mutable Random rng;
  
   Comparison_result
   compare_xyz(const Point &p, const Point &q) const
@@ -1501,6 +1500,8 @@
            start = start->neighbor(ind_inf);
     }
 
+  Random rng (0L);
+
   switch (dimension()) {
   case 3:
     {

--
Sylvain Pion
INRIA Sophia Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/