Hello, I have a simple particle system to simulate fallen leaves (With a simple leaf quad and texture sheed animation) I have activated the "Collision" module to stop the leaves when they touch the ground. I also set "Rotation over lifetime" to make the leaves rotate a bit. The problem is: The leaves keep rotating once they touched the ground, which looks really silly (like breakdancers). I did not found a fitting setting in the "Collision" module. I was also trying to change the rotation from "Rotation over Lifetime" to "Rotation by Speed" but I did not find a setting that did work. Whats the best way to stop the rotation once the leaves collide?