What setting does crysis have to be on to be able to destroy buildings and fences?

I don't believe destructible terrain is controlled by a specific setting in Crysis...

There is a physics option in the settings. Put it to anything other than low and you can destroy buildings and fences

Well i have my settings on low and a few set to medium. but nothing is destroyable except for crates, trees and vehicles. But i see vids of entire building collapsing on youtube.

When you say "few", are you sure physics are set to medium?

Shows how much I know about a game I play. xD;;

Of course, it doesn't help that I don't have anything on low, so I didn't know things weren't destructable by default.