Props collide with invisible walls possible?

[MrGrim48]

Is there a method of enabling the collision of a physics prop and an invisible wall?

I'm working on modifying the Prop Hunt game mode and have made it so it spawns the prop, create it's physics object then have the player control and follow that instead of a prop attached to the player.
This unfortunately, allows prop players to leave the boundaries of the map.

Edit:
I've attempted enabling custom collisions but it doesn't proc ShouldCollide with the invisible walls.

[MrGrim48]

*Bump*

Sorry if there is a rule against bumping. If I recall correctly, I saw that I think corpses collide with these walls? I may be wrong.

I just need to know what determines whats able to collide with said walls.

The last option I'm thinking of is having to override the physics simulation of the prop and cast a trace on all four sides and somewhat collide that way.