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201:Generic_Ceiling (tag, speed, height, target, flag)

  • tag: Tag of affected sector, or 0 to use the sector on the back side of the line.
  • speed: Ceiling's movement speed. Doom's standard ceilings move at 8, and fast crushers move at 16.
  • height: Distance to move (when target is 0).
  • target: How to determine the ceiling's destination height.
  • flags: Various flags; see below.

This special encapsulates BOOM's generalized ceilings.



target can be one of the following:

  • 0: Move by height units
  • 1: Move to highest neighboring ceiling
  • 2: Move to lowest neighboring ceiling
  • 3: Move to nearest neighboring ceiling
  • 4: Move to highest neighboring floor
  • 5: Move to the sector's own floor
  • 6: Move by the height of the shortest upper texture on the sector


A moving ceiling may optionally copy its ceiling texture and special from a "model" sector. There are two ways to choose a model sector. The trigger model uses the sector on the front side of the line that caused the move. The numeric model looks for neighboring sectors whose ceilings are at the destination height, and uses the one with the lowest-numbered shared linedef. If no model sector can be found, nothing is copied.

flags is composed of:

  • 0: Don't copy anything
  • 1: Copy ceiling texture, and remove special (Tx0)
  • 2: Copy ceiling texture only (Tx)
  • 3: Copy both ceiling texture and special (TxTy)
  • +4: Use the numeric model (default is trigger model)
  • +8: Raise ceiling (default is to lower)
  • +16: Inflict crushing damage


Nuvolachalk.png 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 add them. This will make it easier to understand for future authors seeking assistance. Your contributions are greatly appreciated.

Conversions from linedef types

The following Doom map format types can be converted as Generic_Ceiling:

Type Conversion Trigger
MiniDoomLogoIcon.pngDoom 40:W1 Ceil To Highest Ceiling Generic_Ceiling (tag, 8, 0, 1, 8) Player Cross