Sky Box

Is a cubemap projection of a skyline used to enhance the background of the map.

Example
Example cube cross before assembling to dds cubemap format	Ingame Result
	(Example screenshot showing this skybox in action).

Location of File

Relative to the root directory of the map:

./maps/skybox.dds

The relevant sections of the mapinfo.lua file that effect the colour of the ground are in the atmosphere subtable

local mapinfo = {
   ...
   atmosphere = {
      ...
      skyBox = "",
      ...
   },
   ...
}