Linedef type 535

An example of using a linedef 535 on floor over floor.

Linedef type 535, Scroll Ceiling Texture and Carry Objects (Displacement), is a type of linedef special which scrolls every tagged sector's ceiling flat and carries Objects touching the same ceilings. Unlike linedef type 533, it can be specifically set to start and stop at defined intervals.

Setup

The direction of the control linedef determines the direction the ceiling flat will scroll and the Objects will be carried. The length of the linedef indicates the base scrolling/carrying speed (32 fracunits of length equal one fracunit per tic), however the actual visible speed is set differently as explained ahead.

On its own, this linedef will not scroll the ceiling nor carry Objects. Rather, the flat will scroll and Objects will move whenever either the floor or ceiling of the control sector moves, which can done by using linedef executors. The actual scrolling/carrying speed is equal to the base speed × the control sector's movement speed. The direction of the scroll and carrying will be reversed if the floor or ceiling height of the control sector is lowered instead of raised.

To keep things simple and easier to control, the best thing to do is just use a base speed of 1 fracunit per tic (by giving the control linedef a length of 32 fracunits), and control the scrolling/carrying speed by moving the floor or ceiling of the control sector.

If this linedef is used in conjunction with linedef type 401, the scroller will immediately jump to the specified distance (and any Object will move said distance). If this linedef is used in conjunction with linedef type 404, the scroller and carrier will move continuously until the control sector reaches the given ceiling height. If this linedef is used in conjunction with linedef type 407, the scroller and carrier will only work as long as the linedef executor is being continuously triggered.

If Flag [6] / Not Climbable is checked, the carrying effect is made exclusive – once an Object has been pushed by this effect, it cannot be pushed by any other pushing or carrying effect in the same tic. This is useful if the effect is applied to multiple adjacent sectors, since it would normally be applied twice when an Object crosses the border between two sectors with the effect. This flag should be checked when using the linedef special in conjunction with linedef type 64; otherwise the player will not stand still on the "moving sector".

Sample

Example file: ex_ld535_scrollceilingtextureandcarryobjects_displacement.wad (MAP01)

How to use

You may load this file into your favorite map editor, such as Zone Builder. Select MAP01 as the map to load. You may also load this file in the game: Save ex_ld535_scrollceilingtextureandcarryobjects_displacement.wad into the addons folder of your SRB2 directory. Start SRB2, go to the Addons menu, and then select ex_ld535_scrollceilingtextureandcarryobjects_displacement.wad. Start the game in Single Player mode. Press the Console button (~), and type in the command MAP MAP01 to access the example map. When you load this file in the game, it replaces Greenflower Zone Act 1.