I'm creating an installation which is a game (again) where the player controls a graph by moving their white coated selves left and right.



The peak of the graph (their white outline - scan for highest bright point or something - it kinda works, needs polishing) is used to skoosh the ball into the correct goal, red or blue.

I used the traer physics library to get the whole thing looking sexier and so far it works.

My trouble is that I'm just checking either side of the ball for a higher point on the graph to decide whether to skoosh left or right.

What happens is that it will get stuck in a trough, roll to the small peak on it's right and then zoop up a mountainous peak on the left because I'm forcing it to stay above the line of the graph.

How can I get my ball to roll around on the rope realistically?

In case someone else runs into this problem I've been offered a solution at university by boredomresearch.

Rollercoaster simulation.