Passable collisions?

Hi folks, I’ve got a basic understanding of collisions, but what I want to know is this:

Can I make an object pass through another, but still have OnCollisionEnter called?

That is what triggers do.
Just check the IsTrigger property checkbox in the Inspector.

Instead of OnCollisionEnter you will need a OnTriggerEnter.

See the manual for details:
http://unity3d.com/support/documentation/Manual/Physics.html

Good luck!

That’s brilliant thanks, worked a treat.