I started making some props for BZII

[TheJamsh]

ive always wondered... what happens to the terrain if the terrain__h plate has more verts than the terrain underneath it?

[BNG Da BZ Fool]

I was wondering about this as these props are just eye candy and serve no other purpose. I'd like to make it so that units can pass straight through them. In the past, I noticed in the FE Urban Meltdown map the units were continually getting stuck during game play in hollowed out buildings the map uses; really quite frustrating when trying to send units around the map only to find both the AI and my own units hopelessly stuck in building props ruining a otherwise perfectly good map.

What I'm asking is can my eye candy props be prepared in such a way as to make them not interfere with free unit movement?

[Nielk1]

Better ODF tunnels can keep AI out of things.

[mrtwosheds]

Buildings need an area around the collision (the base plate) It MUST be at least >=8 wide or units will get stuck pathing round it. 7.999999 will cause problems.
Buildings with no collisions are an invitation for people to put turrets inside them...
Odf tunnels tell units where they can and cannot go within a building, they also have to be the right size to work properly.

EDIT
To be clearer, A base plate using- building's collision mesh usually covers the whole area, flat (=0 height) collision must be at least 8 wide all around the building or AI units will not be able to path round the raised area. Even if it is only 0.1 high, odf tunnels must be used to get units to negotiate any collision higher than 0.
I found this out the hard way.
so a ibpgen for example has a base plate of exactly 32 square, so the collision (and the building) should not be wider than 16 or you will not have 8 flat all around it.

[BNG Da BZ Fool]

I see your point about placing units inside buildings without collision boxes. Although, it could be an interesting way to simulate weapons fire similar to an occupied structure. Can such buildings take damage and evtually be destroyed? Might be a cool way to make some tank bunker buildings. Has anyone ever played around with the idea of non-collision based building props?

[mrtwosheds]

Explosions damage buildings without collisions. The way to make an occupied structure would be to design it as a gt or use tapped turrets on another building. Not having collisions on solid structures just looks bad when things go through it.