Linedef type 67
Linedef type 67, Move Ceiling by Displacement, is a type of linedef special which is used to move the ceiling of every tagged sector by changing the floor height of the linedef's front sector. It behaves in a similar manner to displacement plane scrollers (linedef types 512, 515, 522, 525, 532 and 535), but instead of scrolling the plane, it changes its height.
On its own, this linedef will not move the tagged sector's ceiling. Rather, the ceiling will move whenever the floor of the control sector moves, which can done by using linedef executors. The length of the control linedef determines how the movement of the control sector floor is translated to the target sector ceiling. A value of 256 means the movement is translated 1:1, i.e., the target sector ceiling always moves the same distance as the control sector floor. Lower values mean the target sector ceiling moves slower, higher values mean it moves faster. If Flag  / Not Climbable is set, the target sector ceiling moves in the opposite direction of the control sector floor.
If this linedef is used in conjunction with linedef type 400, the target sector ceiling will immediately jump to the specified height. If this linedef is used in conjunction with linedef type 403, the ceiling will move continuously until the control sector floor reaches the given height. If this linedef is used in conjunction with linedef type 405, the ceiling will only move as long as the linedef executor is being continuously triggered.
- Example file: ex_ld067_moveceilingbydisplacement.wad (MAP01)
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