I hope your only thinking of just modeling the hair :b

Most hair for realtime 3D models is created using textures on the base model, though if they hair needs to be off the head (like long hair on a female character), then it''s usually a texture mapped on to a series of subdivided, deformed planes.

Check these links for info on various 3D hair creation techniques:

http://webplaza.pt.lu/public/mbarnig/pages/3Dhair.html
http://www.comet-cartoons.com/toons/3ddocs/hair/
http://www.newtek.com/products/lightwave/tutorials/modeling/hair/

Pulled right from Google''s first page of results; I''m sure there''s many more if you just take a look. And if you''ve ever got future questions, ALWAYS hit Google first - you''ll get a faster answer than on here, and probably a more useful/in-depth one on topics that require figures to really illustrate the issues. I don''t want to discourage anyone from posting here, of course, but always try to find the answer yourself, and when all else fails, RTFM.

-Nick "digisoap" Robalik
Web & Print Design, 2D & 3D Illustration and Animation, Game Design
http://www.digital-soapbox.com
nick@digital-soabox.com