This is really dumb (collision size)

I can't seem to edit the collision size of units or buildings. I change the numbers but nothing happens when I test them in the world editor or in-game. Things collide with them exactly the same no matter what type of unit they are. Do I have to turn something on somewhere? I've looked everywhere for someone with the same problem and am posting here as a last resort. If anyone has any ideas, that would be fantastic. I'm sure the answer will make me feel sufficiently stupid.

Are you setting it larger or smaller? For units, there is a maximum collision size (not sure on the exact value atm) and for buildings there is still a pathing map over which units can't walk.

I'm just trying to make the collision size for a building match the scaling size so units don't disappear inside when they're standing around the edges. Scaling size for the barracks increased to 1.40. I was trying to discover the appropriate collision size to match when I realized it didn't work.

Also there seems to be no effect when I reduce the collision size on the barracks. Also tried it on a footman, also with no effect.

Like blu_da_noob said, you have to change the pathing texture. Just select a different building for the pathing texture that is around the same size and shape as the building you are changing.

So, what exactly is collision size good for then?

Anyway, thanks.

Collision size does work on units. Perhaps you weren't changing it enough, or you were going over the game constant maximum.

I've seen Collision Size having more effect on AOE spells than on pathing

Collision size does affect units and pathing, it does not affect buildings. Collision size also has a much greater effect on flying units than other types.

The maximum collision size is either 64 or 96 by default, i believe you can change that in Gameplay Constants, but i'm not sure if it has any effect as i've never needed a collision size bigger than 64.

Press P and you get the pathing display shown in World Editor, which should give coloured squares around your terrain and buildings.