#31 Port of NeHe tutorial 47

[Brian Leair]

Port of NeHe.gamedev.net tutorial #47.

Requires:
- nvidia card
- nvidia cg runtime
- pycg (try PyFx
http://graphics.cs.lth.se/pyfx/download/ or
http://www.csit.fsu.edu/~mason/?section=projects:personal:pycg\)