How do I use ContactXAt and ContactYAt?

ContactXAt and ContactYAt seems to return the correct X and Y and sometimes not (sometimes just returns x:0 and y:0). Is there a way to make it get the right coordinates correctly more consistently?

Capx example

Physics has its own collision detection system, which works differently.

Besides, the ball object has rectangular collision polygon, and in physics properties you set Collision mask to Circle. So "On collision event" may happen before Physics behavior registers it.

Try using this condition instead: ball.Physics.ContactCount>0