Positions of players in a car race?

Hi all
I want to know what is the algorithm to calculate the positions of players in a car race.
Also, how to know when a car is going in the wrong direction?
Thanks.

It’s quite complex question, imho. In short, I used waypoints setted up along the track. If movement vector is directed from lower to higer waypoint - we drive right . Here my old experiments (ODE + AI, based on waypoints): panda3d.org.ru/files/reroll.zip

OK thanks!
had also thought of this before, it seems very well.
I guess this also can be used to find the positions of the players (1st, 2 …). If Player 1 passes through a higher waypoint, the player 1 is first in this instant…

Yes, In my example I also find player positions by similar way (see left top corner). Small white box shows the next waypoint

ok excuse me, only had executed the script editor.py and not main.py
Thanks!!

If your waypoints are fairly sparse, I imagine that you can refine the above suggestion for finding the position of a car as follows:

• Consider each neighbouring pair of waypoints to define a line segment, defined as wayPoint + k*nextWayPoint, where “k” is some value that we will be attempting to find.
• First, define the car’s position as shown above, by essentially finding which segment the car is currently in.
• Now find the point on the segment that is closest to the car’s location; specifically, find the value “k” in the equation above that defines that point.
• Cars are then ranked first by which segment they are in, then by their “k” within that segment.

With a little more work you could even use this to calculate roughly what percentage of the track the car has run in a given lap, I believe.