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If the given number_of_points is smaller than the number of points of the track
then the track points wich their index is above the given number will be discarded.
This will have the effect of shortening the track.
If the given number is bigger then the current number of points of the track then
the engine will increase the number of points of the track.
note though that the new added points are all set to 0,0,0
so you must set their values later using STATE_track_set_point()
To conclude, it seems that this function is not very useful.
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