Knowledge Base - Flat Warping
A nice visual feature of the new versions of ZDoom is the flat warping. The effect is very similar to the Quake water effect and enhances the visuals of any wad. The sample wad wpflat.wad shows the effect using a standard Doom flat.
To have flats warp in a wad, an entry must be made in the ANIMDEFS lump. The format is very simple:
warp flat flatname
where flatname is a name of a flat like FLOOR6_1, used above in the demo wad.
That is all there is to it. Too simple huh?