I've just uploaded an article on obtaining track normals when you're
using splines. Although for any car sim creator his/her spline system
is probably quite different from Racer's, there might still be some
ideas in there.
http://www.racesimcentral.net/
Any comments are ofcourse welcome.
Hope it's an interesting read,
Ruud van Gaal
Free car sim: http://www.racesimcentral.net/
Pencil art : http://www.racesimcentral.net/