Linedef type 61
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Linedef type 61, Crusher (Ceiling to Floor), is a type of linedef special which makes the ceiling of a specified sector continuously crush down from the ceiling to the floor and retract upwards at half the speed until it is even with the ceiling of the bordering sectors. If a player is caught beneath the sector when it crushes, they will be killed instantly. This is the simplest way to create a crusher, but there are several other types of linedefs which will allow you to make more specialized crushers.
The control linedef should be tagged directly to the specified target sector. If you want, you can actually put the control linedef on the target sector itself, but this isn't necessary; you can also use a control sector. The length of the linedef determines the crusher's speed. One fracunit of length equals 0.125 fracunits per tic.
Checking Flag  / Solid Midtexture / Effect 4 makes the crusher move at twice the provided speed, keeping a constant speed while crushing or retracting. With this flag checked, the speed is determined by the linedef X distance.
- Example file: ex_ld061_crusher_ceilingtofloor.wad (MAP01)
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