I don't really understand how collision works or is altered in Oblivion. I'm trying to get rid of the invisible wall that prevents you from jumping into the arena during gambling matches. I inserted the mesh (chorrolarenagamblingpit01.nif) into a test cell and noticed that you can't shoot out of the mesh, but you can shoot into it.

How does this, and collision in general work? And how is it altered?

Awesome, I finally figured it out.

http://www.squidoo.com/Nif_Collision

Great tutorial there. Finally got it to work. Thanks for the help, forum!

I kid.