[Gmsh] making an equilateral mesh.

[Dr Colin J. Cotter]

Dear Gmsh list,
  I have been trying to make a mesh of equilateral triangles by
extruding a horizontal line at a 60 degree angle (later I will use
periodic boundary conditions so I have an equilateral mesh on the
torus). I have noticed that if you do this then the extrusion divides
the quadrilaterals in the wrong direction and you don't get a Delaunay
mesh (the equilateral one):

Point(1) = {0,0,0,0.1};
Extrude {1,0,0} {
  Point{1}; Layers{5};
}
Extrude {0.5,0.866025403784,0} {
  Line{1}; Layers{5};
}

but it works if you extrude at a -60 degree angle instead:

Point(1) = {0,0,0,0.1};
Extrude {1,0,0} {
  Point{1}; Layers{5};
}
Extrude {-0.5,0.866025403784,0} {
  Line{1}; Layers{5};
}

Is there a way to force Gmsh to produce a Delaunay mesh in the first case?

all the best
--cjc