[Gmsh] euler angle definitions in gmsh

[Umut Tabak]

Dear developers,

How are the euler angles defined in Gmsh? For the General.Rotation X/Y/Z 
when General.Trackball = 0.

Looking at,

http://en.wikipedia.org/wiki/Euler_angles

I see that their definitions might change from one source to another. 
And I have never had an experience with them before :S.

Actually, I found out this

http://geuz.org/pipermail/gmsh/2002/000567.html

from the Faq replied by Christophe which is a good trick, indeed solved 
my problem. But I just wondered how they are defined.

Best regards,
Umut