Editing Ceiling linedef types

=Ceiling Targets=

* Highest Neighbor Ceiling (HnC)

This means that the ceiling moves to the height of the highest neighboring ceiling NOT including the ceiling itself. If the ceiling direction is down (only possible with generalized ceilings) motion is instant, else at the ceiling's speed. If no adjacent ceiling exists the ceiling moves to -32000 units.

* Next Neighbor Ceiling (NnC)

This means that the ceiling moves up to the height of the lowest adjacent ceiling greater in height than the current, or to the height of the highest adjacent ceiling less in height than the current, as determined by the ceiling's direction. Instant motion is not possible in this case. If no such ceiling exists, the ceiling does not move.

* Lowest Neighbor Ceiling (LnC)

This means that the ceiling height changes to the height of the lowest ceiling possessed by any neighboring sector, NOT including itself. If the target height is in the opposite direction to ceiling motion, motion is instant, otherwise at the ceiling action's speed. If no adjacent ceiling exists the ceiling moves to 32000 units.

* Highest Neighbor Floor (HnF)

This means that the ceiling height changes to the height of the highest neighboring floor, excluding the ceiling's floor itself. If no neighbor floor exists, the ceiling moves down to -32000 or the ceiling's floor, whichever is higher. If the target height is in the opposite direction to ceiling motion, the motion is instant, otherwise it occurs at the ceiling action's speed.

* Floor

The ceiling moves down until its at floor height, instantly if ceiling direction is up (only available with generalized types), at the ceiling speed if the direction is down. 

* 8 Above Floor (8aF)

This means that the ceiling height changes to 8 above the height of the ceiling's floor. If the target height is in the opposite direction to ceiling motion, the motion is instant, otherwise it occurs at the ceiling action's speed.

* 24 Units (24)

The ceiling moves 24 units in the ceiling action's direction. Instant motion is not possible with this linedef type.

* 32 Units (32)

The ceiling moves 32 units in the ceiling action's direction. Instant motion is not possible with this linedef type.

* Shortest Upper Texture (SUT)

The ceiling moves the height of the shortest upper texture on the boundary of the sector, in the ceiling direction. Instant motion is not possible with this type. In the case that there is no surrounding texture the motion is to -32000 or +32000 depending on direction. 
* Up/Down Absolute Param 
Only available to parameterized ceiling specials, this target moves the ceiling in its indicated direction by the number of units provided as a special argument.

* To Absolute Height 
Only available to parameterized ceiling specials, this target moves the ceiling to an exact height which is provided as a parameter. This ceiling type always moves either up or down to the given height depending on whether it is higher or lower than the ceiling's current position. This means that instantaneous motion is not possible. 

=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. 

=Ceiling linedef types=

 Regular and Extended Ceiling Types
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 #     Class   Trig   Dir Spd   *Chg *Mdl Mon Crsh Target                     ExtraData mnemonic
 
 43    Reg     SR     Dn  Fast  None  --  No  No   Floor                      SR_Ceiling_DnF_Fast
 41    Reg     S1     Dn  Fast  None  --  No  No   Floor                      S1_Ceiling_DnF_Fast
 152   Ext     WR     Dn  Fast  None  --  No  No   Floor                      WR_Ceiling_DnF_Fast
 145   Ext     W1     Dn  Fast  None  --  No  No   Floor                      W1_Ceiling_DnF_Fast
 
 186   Ext     SR     Up  Slow  None  --  No  No   Highest Neighbor Ceiling   SR_Ceiling_UpHnC_Slow
 166   Ext     S1     Up  Slow  None  --  No  No   Highest Neighbor Ceiling   S1_Ceiling_UpHnC_Slow
 151   Ext     WR     Up  Slow  None  --  No  No   Highest Neighbor Ceiling   WR_Ceiling_UpHnC_Slow
 40    Reg     W1     Up  Slow  None  --  No  No   Highest Neighbor Ceiling   W1_Ceiling_UpHnC_Slow
 
 187   Ext     SR     Dn  Slow  None  --  No  No   8 Above Floor              SR_Ceiling_DnFp8_Slow
 167   Ext     S1     Dn  Slow  None  --  No  No   8 Above Floor              S1_Ceiling_DnFp8_Slow
 72    Reg     WR     Dn  Slow  None  --  No  No   8 Above Floor              WR_Ceiling_DnFp8_Slow
 44    Reg     W1     Dn  Slow  None  --  No  No   8 Above Floor              W1_Ceiling_DnFp8_Slow
 
 205   Ext     SR     Dn  Slow  None  --  No  No   Lowest Neighbor Ceiling    SR_Ceiling_DnLnC_Slow
 203   Ext     S1     Dn  Slow  None  --  No  No   Lowest Neighbor Ceiling    S1_Ceiling_DnLnC_Slow
 201   Ext     WR     Dn  Slow  None  --  No  No   Lowest Neighbor Ceiling    WR_Ceiling_DnLnC_Slow
 199   Ext     W1     Dn  Slow  None  --  No  No   Lowest Neighbor Ceiling    W1_Ceiling_DnLnC_Slow
 
 206   Ext     SR     Dn  Slow  None  --  No  No   Highest Neighbor Floor     SR_Ceiling_DnHnF_Slow
 204   Ext     S1     Dn  Slow  None  --  No  No   Highest Neighbor Floor     S1_Ceiling_DnHnF_Slow
 202   Ext     WR     Dn  Slow  None  --  No  No   Highest Neighbor Floor     WR_Ceiling_DnHnF_Slow
 200   Ext     W1     Dn  Slow  None  --  No  No   Highest Neighbor Floor     W1_Ceiling_DnHnF_Slow
 
 Generalized Ceiling Types
 ---------------------------------------------------------------------------
 #      Class   Trig   Dir Spd   *Chg *Mdl Mon Crsh  Target
 
 4000H- Gen     D1/DR  Up  Slow   None Trg Yes Yes   Highest Neighbor Ceiling
 5FFFH          S1/SR  Dn  Normal Tx   Num No  No    Next Neighbor Ceiling
                W1/WR      Fast   Tx0                Lowest Neighbor Ceiling
                G1/GR      Turbo  TxTy               Highest Neighbor Floor
                                                     Floor
                                                     24
                                                     32
 *Mon(ster) enabled must be No if                    Shortest Upper Texture
 Chg field is not None
 
 Tx = Texture copied only           Trg = Trigger Model
 Tx0 = Texture copied and Type->0   Num = Numeric Model
 TxTy = Texture and Type copied
There are currently seventeen types of parameterized ceiling specials, each performing a different type of ceiling action. See the Parameterized Ceiling Types section for full information on how to use these specials. 
 Parameterized Ceiling Types
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 #        Class   Function                           ExtraData Name
 
 323      Param   Up to Highest Neighbor Ceiling     Ceiling_RaiseToHighest
 324      Param   Up to HnC Instant                  Ceiling_ToHighestInstant
 325      Param   Up to Nearest Neighbor Ceiling     Ceiling_RaiseToNearest
 326      Param   Down to Nearest Neighbor Ceiling   Ceiling_LowerToNearest
 327      Param   Up to Lowest Neighbor Ceiling      Ceiling_RaiseToLowest
 328      Param   Down to Lowest Neighbor Ceiling    Ceiling_LowerToLowest
 329      Param   Up to Highest Neighbor Floor       Ceiling_RaiseToHighestFloor
 330      Param   Down to Highest Neighbor Floor     Ceiling_LowerToHighestFloor
 331      Param   Down to Floor Instant              Ceiling_ToFloorInstant
 332      Param   Down to Floor                      Ceiling_LowerToFloor
 333      Param   Up Abs Shortest Upper Texture      Ceiling_RaiseByTexture
 334      Param   Down Abs Shortest Upper Texture    Ceiling_LowerByTexture
 335      Param   Up Absolute Param                  Ceiling_RaiseByValue
 336      Param   Down Absolute Param                Ceiling_LowerByValue
 337      Param   To Absolute Height                 Ceiling_MoveToValue
 338      Param   Up Absolute Param, Instant         Ceiling_RaiseInstant
 339      Param   Down Absolute Param, Instant       Ceiling_LowerInstant

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