Need a refresher course in collision/line of sight.

[Kino]

Hey everyone, haven't been around for quite awhile.

Ive since forgotten if there is a way to prevent ranged units from firing across a doodad/destructible wall.
If so, what collision type should I be using for that wall?

 

[Wark]

If there's a way to do that without a custom projectile system, I would like to know as well.
Otherwise, I usually adjust the occlusion height of the object to 200 so that the unit can't see what's behind.
This won't stop ranged units from firing there, though, if something else gives them line of sight.