Lift
From DoomWiki.org
Lifts, also internally known as plats (short for platforms), are a class of sector thinkers which affects the floor motion of a sector in ways typically more complicated than simple floor actions which raise or lower a floor to a given height.
Contents
Types[edit]
The most common type of platform is the simple lift. In Doom, lifts move from their starting height down to the lowest surrounding floor height (if no such sector exists, no movement takes place). They can move at speeds of 4 or 8 map units per tic. When moving at the speed of 8 units/tic, they are described as "blazing" platforms. All such lifts wait for a time period of 3 seconds before returning to their original starting height. In editors, such lift actions are sometimes described in terms of their effected motion sequence as "down-wait-up-stay".
Strife, Hexen, and Doom 64 all provide independent implementations of a similar platform action which starts the platform at a low height and raises it to the height of the highest surrounding floor. These actions may be referred to as "up-wait-down-stay".
Another type of platform action implements simple floor-raising behavior which changes the properties of the sector it affects. A "raise to nearest and change" platform action raises its floor to the next highest neighboring floor, adapts the floor texture on the first side of the activating switch linedef, and sets the sector special to zero. A "raise and change" platform action raises its floor by a set amount depending on the action type, adapts the floor texture on the first side of the switch, and does not change the sector's special. Both of these types move at a speed of 0.5 units per tic.
Strife implements a special variant of this action which raises a floor by 512 units, for use in the power station's reactor coolant pit.
A final type of platform action is referred to as "perpetual raise", and forever moves a floor between two different heights unless suspended via a "stop platform" action. This type of platform moves between the lowest and highest surrounding floors, reversing its motion whenever the current destination height is reached after a short pause. Whether such a floor initially moves up or down is random. The speed of this type of platform is one unit per tic.
Limits[edit]
Only 30 platform actions can be active at once, regardless of type. If this limit is exceeded the game will bomb out with the error message "P_AddActivePlat: no more plats!". Most source ports remove this limitation.
