|This feature is deprecated|
It's recommend not to use this feature.
EVENT_DAMAGEHPLANE is a Game Event.
This event is triggered whenever a floor or ceiling is hit by a weapon. Note that kicks don't trigger this event nor does the radius damage of the devastator.
You can make pieces of glass fall down from the ceiling by setting RETURN to 1048576, this will also play the GLASS_BREAKING sound (this does not change the ceilingpicnum, you still have to do this yourself).