Linedef type 53

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Linedef type 53, Continuous Floor/Ceiling Mover, is a type of linedef special which moves the floor and ceiling of a sector or an FOF vertically back and forth between specified heights. It is useful as an alternative for moving platforms made with linedef type 59 or linedef type 60, as its change of direction is faster. It can also be used to make simple elevators and FOF crushers.

Setup

To use this effect, create two control sectors outside of your map, joined by a single linedef. The easiest way to do this is to create two small squares of equal size which share a linedef. The linedef which joins together the two control sectors should be set to have linedef type 53, and be tagged to the desired target sector(s) within the map or FOF control sector(s).

The target sector's/FOF's floor and ceiling will first move to the floor and ceiling heights of the linedef's front control sector, then to the floor and ceiling heights of the linedef's back control sector, then to the front sector again, and so on. The length of the controlling linedef determines the speed of the movement; one fracunit of length equals 0.25 fracunits per tic.

It is possible to add a delay before the floor and ceiling begin to move, by setting the time in tics in the control linedef's front texture Y offset. If you want the ceiling and floor to delay every time before changing direction, you can do so by setting the time in tics in the control linedef's front texture X offset.

Sample

Example WAD: ex_ld053_continuousfloorceilingmover.wad
  Linedef types – Plane movement [view]
Continuously Falling SectorContinuous Floor/Ceiling MoverContinuous Floor MoverContinuous Ceiling MoverContinuous Two-Speed Floor/Ceiling MoverContinuous Two-Speed Floor MoverContinuous Two-Speed Ceiling MoverActivate Floating PlatformActivate Floating Platform (Adjustable Speed)Crusher (Ceiling to Floor)Crusher (Floor to Ceiling)