Linedef type 448
Linedef type 448, Change Skybox, is a type of linedef executor which, when triggered, changes the skybox displayed in the background of the level. This effect is useful for levels which run through several different types of environments.
The tag given to this linedef is irrelevant. By default only the Skybox View Point will be switched. The control linedef's front texture X offset sets the ID of the new viewpoint (specified using the view point thing's Parameter value), which should be a number between 0 and 15. If the front X offset is an invalid number (such as -1) the game will not use a skybox view point at all. If Flag  / Block Enemies is set, the center point will be changed as well. The front Y offset sets the ID of the new centerpoint. As with the above, invalid numbers will make the game not use any center point. If Flag  / Solid Midtexture / Effect 4 is set, the view point will not be changed. By default, this linedef executor only affects the player who activates it. If Flag  / Not Climbable is set, this linedef will affect all players simultaneously.
- Example file: ex_ld448_changeskybox.wad (MAP01)
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