How do you make a sliding door???

Hi, I need help making a sliding door I want it to open once I step in a specific sector how do i do that???? but even if i try putting the line Def it still wont work how do you make one I have checked the wiki but no luck :(

Well, if you want to make a horizontally sliding door, you'd have to use a PolyObject, and a special linedef executor. Look at the Wiki again, focusing on PolyObject tutorials.

Vertically sliding doors are much, much easier; you just have to have a Change Floor Height or Change Ceiling Height Linedef Executor. I'd recommend you do that instead.

I looked in CEZ1 and you have to use PolyObjects and lots of control sectors that I don't really know what they mean. If you want to explore the map more, fine with me.

Dang. fawfulfan beat me to it...

the wiki tutorials got confusing i got some of what i needed but i still don't understand the zoom tubes some of what the wiki told me was understandable but i still need help on the sliding door and the zoom tube ( i figured out how to make gravity switch and a raising platform though. )

There are sample wads for both polyobjects and zoom tubes on the wiki. Try to download these and see how they work if you don't understand the tutorials.