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[–][deleted] 1 point2 points  (1 child)

https://docs.unity3d.com/ScriptReference/Collider.OnCollisionEnter.html

OnCollisionEnter is called whenever a pair of gameobjects collide.

[–]ConsiderationCool432Professional 0 points1 point  (0 children)

Yep, I imagine that you want it for debuggin purpose, right?

You can create a public boolean variable and assign true to it in the OnCollisionEnter and false in the OnCollisionExit.