Creating a trimesh whose cross section is a user specified oval

[Martin Dillon <martin dot dillon at optusnet dot com dot au>]

I'm using the new trimesh class to create and manipulate trimeshes on 
the fly. One of the types of models I'm generating has a body with an 
oval cross section. I plan to allow my users to have the ability to 
adjust the degree of 'flatness' of the models oval cross section using a 
slider.
Can anyone point me to an algorithm that would allow me to determine the 
correct positions to place vertices so that they define an oval with 
arbitrary width/height ratio?
Thanks,
Martin

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