Can collision detection only be done on scripts attached to the object you want to collide?

So can stuff like OnCollisionEnter and OnTriggerEnter only be done on scripts attached to the actual game object?

I am a beginner if you can't tell from the question!

Thanks

 

Yes, those message are only sent to script on the same object.

If needed, you can attach a small "message forwarder" script that can call methods on another object when it receives the messages.

 

Thanks!