[Gmsh] meshing differences between version 1.65.0 and 2.0.4

[Daniel Wheeler]

Hi,

I have been updating a computer code to use the new gmsh 2.0 file  
format. In the process I noticed that
the new version of gmsh seems to a produce different mesh when given  
the same .gmsh input file. The code to create the mesh is:

         cellsize = 0.0952380952381 ;
         height = 2.0 ;
         spacing = 1.0 ;
         Point(1) = {0  , 0, 0, cellsize } ;
         Point(2) = {spacing, 0, 0, cellsize } ;
         Point(3) = {0  , height , 0, spacing } ;
         Point(4) = {spacing, height, 0, spacing } ;
         Line(5) = {1, 2} ;
         Line(6) = {2, 4} ;
         Line(7) = {4, 3} ;
         Line(8) = {3, 1} ;
         Line Loop(9) = {5, 6, 7, 8} ;
         Plane Surface(10) = {9} ;

This is basically a box that forms 2D triangles when meshed.

Using version 1.65.0, the mesh produced by doing

       $ gmsh box.gmsh -2

where box.gmsh contains the commands above,
produces a mesh with 33 nodes and 75 elements. When version 2.0.4 is  
used, the mesh has 87 vertices and 172 elements.
Should the default meshing be different between these two versions?

Thanks.

--
Daniel Wheeler


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