Dungeon Architect

I think I got your point. I’ve added a selector helper function so you can selectively exclude the ceiling mesh if a stair is present in that ground location. I’ve placed the following logic in the ceiling mesh attached to the ground marker


This way it will not include a ceiling mesh where there are stairs

Then on the stair marker, I attach a mesh like this with a offset
http://i.imgur.com/GCl1Iacm.jpg

And it cleanly covers up the ceiling everywhere. (Be sure to adjust the collision of the mesh so it doesn’t block the character)
http://i.imgur.com/aCL8nLam.jpg http://i.imgur.com/dnpHUTzm.jpg

watch?v=OR1bw9ucz0w

I’ll publish a new build soon with this ContainsStair selection function