Thanks all! now i'm working on cleaning up the code (that was quite a mess ) than i will release it, so that anyone can look at it and eventually help.

The bug with the car flipping is now corrected. That was an empiric way to flip the car.. No surprise that it didn't work.. Now the program detect if the car is flipped and auto-flip it in a nice way. (anyway this need more work i think).

The fact that the car get stuck depends on that i used plane surfaces instead of solid 3d body. That's the case with the road and the swirl.

I must think now of a way to do the tracks

Bye!

BTW i noticed that i was missing backface culling at all :shock:
Now i added it.