Algodoo

Excellent scene! It was well designed, and it works as intended.

I do have one suggestion for you to consider. Engineering types, such as s_noonan, myself, and a few others, understand what "type: scene.my.speed (N), where 0 < N < 7" means, and we understand the PID control system. But there are many users who don't have a clue about those sorts of things, and they will either not be able to operate the scene, or they may fumble around with it not knowing what exactly is going on. So, my suggestion is to add some sort of user input to the scene that would eliminate the need to go into the console to make changes to functions or variables. Maybe look at some other scenes in the Algobox archive to see how others have implemented user interfaces. In this scene, all you would need to do is to make the up/down arrow keys add/subtract a value to a variable which would make the car speed up and slow down. You then only need to add a note to the scene that tells the user to use the arrow keys to increase or decrease the speed of the car.

thanks, great advice! didn't think about it will implement

update:
ok, did it.

Works very well!