Procedurally breakable objects are really up to the physics system to implement, and they haven't really been done in any game to date. Julio of Newton Game Dynamics has an early demonstration of his implementation here:
http://youtube.com/watch?v=Q3wF0Klk5wU
It isn't graphically impressive at this point, but it is a proof of concept.
http://youtube.com/watch?v=Q3wF0Klk5wU
It isn't graphically impressive at this point, but it is a proof of concept.