How do you create floating platforms?

[ronin sanji]

Just like the title says.
I've checked the wiki, but I can't find anything.

 

[BlueZero4]

Not sure if I'm late, and this has already been remedied, but FOF's are made using sector tags. It's a variable on the sector and linedef properties.

1)Make a sector where the FOF will appear above. Set the sector tag to 1. You might think of it as a shadow.
2)Make a sector outside the map. (For future reference, it's called a control sector.) Set the ceiling height to the top of your block. The same applies with the floor of the control sector and the underside of the block. You can set the sector lighting in the control sector, and that will be the darkness of the shadow cast.
3)Open up one of your linedef's properties that makes up your control sector. Set the linedef action to 3D - Solid, Opaque, Shadowcasting (CTL sector light level used below) under 3D. Afterwards, you should see Linedef action set to 25. Now tag the linedef 1.
4)The rest of your map should be built so you can at least see your FOF. Test it out and look for any bugs.

 

[ronin sanji]

Sorry to be an idiot but I still don't understand.

 

[BlueZero4]

Here, the REAL tutorial. You should've gone here in the first place.

http://ssntails.sepwich.com/srb2/dbtutorial/tutorial7.html

 

[ronin sanji]

Thanks alot. This really helps, I'm trying to make a emerald stage type match level, so it wouldn't be complete without this.