destructible obstacles

[elite]

Ok, id like to know how to make destructible obstacles like the ones in liero or Worms. So when i throw a grenade at something like, lets say, a BIG rock, id like a chunk of it to fall of when the grenade hits it.

[Spidy]

for the rocks
open rock control panel
(colision=anyside of grenade=destroy actor)
and
(destroy actor=create actor = the rocks breaks pieces)
and go to rocks breaks pieces control panel
(animation finsh=destroy actor {event actor})

try it