Source : http://www.campaigncreations.org/warcraft/worldedit/ceilingtutorial.shtml

How to make Ceilings in the World Editor
By Warbringer87


Basic Tools:
· The Frozen Throne
· World Editor
· That it, what else you want?


How its done:
This method uses the new doodad type supplied with The Frozen Throne, Elevators! Elevators for me personally have become the most useful of the doodads, as they can be used in a variety of ways. However, to prepare the elevators, one should have basic knowledge of the Object Editor.



Change the highlighted field in the above picture to:
“Mushrooms, Cattail, Birds, Remains Scorched, Lily Pads, …”
It is found in the “Doodads” Section of the pulldown menu. Also, the fieldd called "Walkable - True", change that to "False"
After this single property is changed, Elevators themselves change – they no longer are “walkable.” They no longer act like a bridge, and therefore they do not interfere with walking units, just like Mushrooms, and such.

 

Making the Ceiling:



Make some terrain like the picture above; don't worry about tilesets, though I
recommend using Cityscape, Dalaran, Dalaran Ruins, Black Citadel, Sunken Ruins, Dungeon or Underground for this. I have randomly placed different terrain tiles so you can distinguish between what tile and what ceiling. Next, look in the doodads section of the bush list, and find the Elevators. Elevator (2) is what you are looking for, find it, for Sunken Ruins, it will look like this:


Arrange these Elevators next to each other, making them slightly overlap each other. Basically, if you see a line they need to overlap more. For sunken ruins, here is an example.

The top two elevators are how it should NOT be like, and the bottom two are how it should be like. This is critical to the nice looking ceilings you will get, as they look right if use the bottom method.


Keep arranging the elevators until you get something that looks like this. Then, you’ll have to move the whole thing into place.


Move the Elevators until they are on the Cliff tiles like the picture below.

Now you will have to move them, as in raise them; if you have no idea what I am talking about, go ask someone else. I won’t spend time discussing simple abilities of the World Editor**. Keep raising all the Elevators until they are level with the top of the cliff.
Eventually, you should get something like the picture below. Congratulations, you have put a roof on your….wall things…


Now, if you wonder how I got the effect shown here, look under your roof.
And you will see this if you did it right:

Now go forth, and experiment with Elevators!!!!
And the mushrooms!

** [Hold the 'shift' key and press page-up or page-down the doodad. - ed.]