Linedef type 455
This special is set up similarly to linedef type 447, but with some additional considerations for fading.
By default, the colormap in the tagged sector(s) will gradually be replaced with the colormap specified in the control linedef's front texture fields. The colormap is supplied in the same format as for linedef type 606: The front upper texture specifies the light color, which is used if the target sector is at full brightness. The front lower texture specifies the fade color, which is the color that the colormap fades to as the target sector fades towards darkness. Both colors are supplied in the format
BB determine the amount of red, green, and blue, respectively, while
A specifies the alpha value. The front middle texture can be used to set optional parameters in the format
A sets the colormap's flags, while
CC set the starting and ending brightness level for the fading effect, respectively. Refer to linedef type 606 for a detailed explanation of the colormap settings.
By default, the starting colormap of the fade will be the current colormap of the target sector. If the linedef is two-sided and Flag  / Transfer Line is set, the starting colormap will instead be specified in the control linedef's back texture fields, in the same format as the destination colormap. If no starting colormap exists (because no colormap was applied to the target sector), it will be set to the destination colormap, but at full transparency. This will cause the destination colormap to gradually fade in from nothing. If Flag  / Bouncy Wall is set, the starting colormap will instead be black at full transparency.
The linedef's front Y offset controls the speed of the fade, where a value 1 corresponds to a fade that is 256 tics long. If the front Y offset is 0 and the control linedef has a back side, the back Y offset is used instead. If Flag  / Solid Midtexture / Effect 4 is set, the Y offset will specify the fade's duration in tics instead. Normally, the fade will not be performed if another fade is still ongoing. If Flag  / Repeat Midtexture / Effect 5 is set, the ongoing fade will be interrupted instead.
If Flag  / Peg Midtexture / Effect 3 is set, the colormap specified in the front texture fields will be added to the existing colormap instead of replacing it. For example, adding a green colormap to a red colormap will make it gradually turn yellow. The red, green, blue and alpha values of both the light and fade color, as well as the starting and ending brightness levels, will be added to the respective values of the existing colormap. The colormap flags will be replaced entirely at the midway point of the fade. Combining this flag with flags  / Slope Skew / Effect 1,  / Not Climbable, and/or  / No Midtexture Skew / Effect 2 will instead subtract the red, green and/or blue values of the new colormap from the values of the existing colormap, respectively.
If Flag  / Lower Unpegged is set, the new colormap's alpha values will be taken from the control linedef's front X and Y offsets instead of the
A values in the texture fields. The X offset sets the light color alpha value and the Y offset sets the fade color alpha value. This is mainly useful if you want to reduce the alpha value of the existing colormap in conjunction with Flag  / Peg Midtexture / Effect 3, since there is no flag for subtracting the alpha value. Instead, you can set Flag  / Lower Unpegged and supply negative alpha values in the offsets. In this case, the speed/duration of the fade will be set via the back Y offset instead.
- Example file: Ex_ld455_fadesectorcolormap.wad (MAP01)
- This example demonstrates the effect of Flag  / Peg Midtexture / Effect 3. When the player steps on the raised floor, the weak yellow colormap will fade to a strong magenta. This is accomplished by subtracting green from the colormap, and adding blue and alpha.
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