[Gmsh] the piston exsample

[wing]

Hi all,

I just compiled 2.2.4 with opencascade support and now I can import .stp 
geometries. Then I tried a 'piston' example, the attached (piston.jpg, 
piston.msh) is the result I got. But I noticed that it's very different 
from the example in the gmsh home page 
(http://geuz.org/gmsh/gallery/piston.png). Seems that my output is too 
rough (the mesh elements are too big). What am I doing wrong? How to get 
a more nice result like what is in the gmsh homepage?
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