Simple FPS camera collison with objects eg wall, crate etc ?

Can someone tell me (give a code snippet or example project) THE SIMPLEST way how to use NxOgre and Ogre3d to setup up an FPS camera colliding with objects like a crate or a gun (to add ammo) or a wall etc?

btw I am new to NxOgre and any help would be appreciated....

btw I am new to NxOgre and any help would be appreciated...

Ok, first lesson: Look for similar threads.

http://www.ogre3d.org/phpBB2addons/viewtopic.php?t=7615

Sorry I usually do but I forgot this time. Thanks for the link though.