Linedef type 514

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An example of using a linedef 514 on floor over floor.

Linedef type 514, Scroll Ceiling Texture (Accelerative), is a type of linedef special which scrolls every tagged sector's ceiling flat without carrying Objects touching the ceiling. Unlike linedef type 513, the speed can be changed in an accelerative/decelerative fashion.

Setup

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

On its own, this linedef will not scroll the ceiling. Rather, the flat will scroll whenever either the floor or ceiling of the control sector moves, which can done by using linedef executors. The actual scrolling speed, in any given instant, is equal to the base speed × the distance the control sector has moved + the speed in the previous instant. In other words, every time the control sector's floor or ceiling rises, the scroller accelerates, and every time the floor or ceiling lowers, the scroller decelerates. If the floor and ceiling are returned to their original heights, the scroller will stop, and if they are lowered past this point, the scroller will accelerate in the reverse direction.

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 speed by moving the floor or ceiling of the control sector.

If used in conjunction with linedef type 401, the speed will instantly jump to a fixed value. If used in conjunction with linedef type 407, the speed will gradually increase or decrease.

Sample

Example file: ex_ld514_scrollceilingtexture_accelerative.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:
    1. Save ex_ld514_scrollceilingtexture_accelerative.wad into the addons folder of your SRB2 directory.
    2. Start SRB2, go to the Addons menu, and then select ex_ld514_scrollceilingtexture_accelerative.wad.
    3. Start the game in Single Player mode.
    4. 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.


  Linedef types – Scroll effects [view]
Wall scrolling:

Scroll Front Wall Left • Scroll Front Wall Right • Scroll Tagged Wall • Scroll Tagged Wall (Accelerative) • Scroll Tagged Wall (Displacement) • Scroll Front Wall by Front Side Offsets • Scroll Front Wall by Back Side Offsets • Scroll Back Wall by Front Side Offsets • Scroll Back Wall by Back Side Offsets

Plane scrolling:

Scroll Floor Texture • Scroll Floor Texture (Accelerative) • Scroll Floor Texture (Displacement) • Scroll Ceiling Texture • Scroll Ceiling Texture (Accelerative) • Scroll Ceiling Texture (Displacement) • Carry Objects on Floor • Carry Objects on Floor (Accelerative) • Carry Objects on Floor (Displacement) • Carry Objects on Ceiling • Carry Objects on Ceiling (Accelerative) • Carry Objects on Ceiling (Displacement) • Scroll Floor Texture and Carry Objects • Scroll Floor Texture and Carry Objects (Accelerative) • Scroll Floor Texture and Carry Objects (Displacement) • Scroll Ceiling Texture and Carry Objects • Scroll Ceiling Texture and Carry Objects (Accelerative) • Scroll Ceiling Texture and Carry Objects (Displacement)

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