From ZDoom Wiki
The screen wipe is a transition between two different types of screen display (such as from menu to game or from game to intermission). It is also possible to use specific wipe types between different screens in an intermission definition.
- "None" switches directly to the new screen, as in Heretic and Hexen.
- "Melt" is the original effect used by Doom.
- "Burn" is an effect original to ZDoom which makes the old screen burn into the new one.
- "Crossfade" fades out the old screen while fading the new one in at the same time, as used in Strife.