Linedef type 602

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Adjustable Pulsating Light is tagged on the left only on the sector, and on the right only on the control sector.

Linedef type 602, Adjustable Pulsating Light, is a type of linedef special which causes the light of every tagged sector to gradually pulsate to a lower level and back to a higher level again. This linedef special is used in Egg Rock Zone Act 2 to create flashing red alarm lighting.


The control linedef's length determines the speed of the pulsating light, in relation to the two brightnesses specified. Four fracunits of length mean that the light level will change by one unit per tic, so the longer the linedef, the quicker the speed. The default speed is 32 fracunits (or 8 units of light level per tic). Both the control sector's and the target sector's brightness levels affect the brightness at which the light pulsates. The lesser brightness level between the two determines the minimum light level for this effect, while the greater brightness level determines the maximum. The difference between the two brightness levels is also a factor in how quickly the light pulsates. The smaller the difference is, the quicker the light will pulsate, even if the pulsating speed set by the control linedef remains the same.

In the Software renderer, the brightness levels can also determine how smoothly the light pulsates. Also note that, since the Software renderer only has 32 distinct light levels, the pulsating effect may not be visible if the chosen light levels are too close together.


Example file: ex_ld602_adjustablepulsatinglight.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_ld602_adjustablepulsatinglight.wad into the addons folder of your SRB2 directory.
    2. Start SRB2, go to the Addons menu, and then select ex_ld602_adjustablepulsatinglight.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 – Lighting [view]
Floor LightingCeiling LightingAdjustable Pulsating LightAdjustable Flickering LightAdjustable Blinking Light (unsynchronized)Adjustable Blinking Light (synchronized)Colormap