[Gmsh] trying to mesh a sphere

[Adrin Gharakhani]

Hello,

I have just come across gmsh and was playing with it and I ended up  
with the following problem.

I'm trying to mesh the surface an ellipsoid (for the sake of simplicity  
let's just look at the sphere). For started I thought of meshing a  
hemisphere using the following:

mu=1;
Point(1) = {0,0,0,.1};
Point(2) = {1,0,0,.1};
Point(3) = {1,1,0,.1};
Circle(1) = {3,2,1};
Extrude Line {1, {0,1,0}, {1,0,0}, mu*Pi};


When mu=<1 the algorithm meshes the surface (though the quality is poor  
near the corners using no special options). However, when I use mu>1  
the algorithm fails to recognize the correct surface and thus ends up  
giving the wrong mesh and worse, sometimes, fails to converge.  Of  
course, the same problem exists with meshing of the full sphere (when  
we use two arcs - a semicircle - to extrude the surface).

Can you please tell me what is wrong with the above set of commands?

Thanks in advance

adrin

------------------------------------------------------------------------ 
---------------------------
Adrin Gharakhani, Sc.D. 
Applied Scientific Research                     Tel:  949-752-7545
1800 East Garry Avenue, Suite 214        Fax: 949-752-0057
Santa Ana, CA 92705                                 
http://www.Applied-Scientific.com
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