From ZDoom Wiki
Makes a monster non-floating. Floating monsters can change their z-position when moving towards a target. This function has no effect on the gravity settings. If the monster is still in the air it will remain there.
|Note: This article lists no examples. If you make use of this feature in your own project(s) or know of any basic examples that could be shared, please. This will make it easier to understand for future authors seeking assistance. Your contibutions are greatly appreciated.|