A challenge porting from FreeBasic (and originally from C)

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Hi Petr, Eros, and Michael,

I'm attaching a neat little program from FreeBasic which I translated from C. The original program was from a math professor friend of mine, George Francis (at U of I... George uses my Python OpenGL text with his REU freshmen).

I would like to translate this program to thinBasic, but the glGetFloatv command, which fetches the aff() matrix (affine matrix) in the chaptrack() function seems problematic. Heck, there are a few other commands that are difficult for this thinBasic newbie, also!

Anyway, if time permits, please take a look and see if anything can be recommended?

What I like about this program is that it allows you to visualize 3D parametric surfaces and rotate them "trackball" style with the mouse (there is a python version in my text, also).

The tro.zip file contains both the .bas file and the .exe file.

Thanks,

Stan