[Gmsh] Bug in test_move_point_parametric_triangle

[Christophe Geuzaine]

Peter Wainwright wrote:
> Amazingly, I have discovered a potentially serious bug in the routines
> which perform edge collapse in the BDS_Mesh.
> 
> Owing to this, it is possible for a point to collapse onto a linear
> boundary creating slivers (triangles with collinear points).
> 
> The problem is that the sides of the triangle, a and b, are not
> recalculated after the point is moved.  Thus, area_final and area_init
> are always equal!  So the test for slivers is defeated.

Indeed! Thanks for the patch.

> 
> I attach a simple patch to fix this.
> 
> That aside, gmsh works great for me. Many thanks for this program!
> 
> Peter Wainwright
> 
> 
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine