[Gmsh] Extrude for unstructured mesh

[Stephan Gekle]

Hi all,

I need to mesh a 2D surface which has been created by extrusion (see 
code below). However, I need all surfaces to be meshed with triangles 
since I am using it with a self-made program which only handles triangles.
How can I make the extruded be meshed with unstructured triangles and 
not with a structured mesh as is done when I run the code below?

Thanks a lot for any help,

   Stephan





lc=0.1;
Point(1) = {-1, 0,  0,  lc};
Point(2) = {-0.5,0,0.5,lc};
Point(3) = {-0.25,0,0.7,lc};

Point(4) = {0,0,1,lc};
Point(5) = {0.2,0, 0.7,lc};
Point(6) = {0.4,0,0.6,lc};
Point(7) = {0.5,0,0.2,lc};
Point(8) = {0.6,0,0,lc};

Spline(1)={1,2,3,4};
Spline(2)={4,5,6,7,8};
Line(3)={8,1};
Line Loop(1) = {1,2,3};
Plane Surface(2) = {1};

Extrude Surface { 2, {1,0,0}, {0,0,0}, Pi}  {
    Layers{20}; Recombine;
};

Mesh 2;