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Ceiling linedef types
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=Varieties of ceilings= A ceiling can be activated by pushing on a linedef bounding it (generalized types only), or by pushing on a switch with the same tag as the ceiling sector, or by walking over a linedef with the same tag as the ceiling, or by shooting a linedef with the same tag as the ceiling with an impact weapon (generalized types only). A ceiling can move either Up or Down. A ceiling can move with speeds of Slow, Normal, Fast, or Turbo. If the target height specified by the ceiling function (see Ceiling Targets above) is in the opposite direction to the ceiling's motion, then travel is instantaneous, otherwise its at the speed specified. A ceiling action can be a texture change type, in which case after the action the ceiling texture of the affected ceiling, and possibly the sector type of the affected ceiling are changed to those of a model sector. The sector type may be zeroed instead of copied from the model, or not changed at all. These change types are referred to below as Tx (texture only), Tx0 (type set to 0), and TxTy (texture and type copied from model). The model sector for the change may be the sector on the first sidedef of the trigger (trigger model) or the sector with ceiling at destination height across the lowest numbered two-sided linedef surrounding the affected sector (numeric model). If no model sector exists, no change occurs. If a change occurs, ceiling texture is always affected, lighting is never affected, even that corresponding to the sector's type, nor is any other sector property other than the sector's type. Numeric model algorithm: 1) Find all ceilings adjacent to the tagged ceiling at destination height 2) Find the lowest numbered linedef separating those ceilings from that tagged 3) The sector on the other side of that linedef is the model A ceiling action can have the crush property (generalized types only), in which case players and monsters are crushed when the ceiling tries to move below the point where they fit exactly underneath the ceiling. This means they take damage until they die, leave the sector, or the ceiling action is stopped. A ceiling action never reverses on encountering an obstacle, even if the crush property is not true, the ceiling merely remains in the same position until the obstacle is removed or dies, then continues.
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