f you�re mapping for a mod, it may come with new skyboxes for you to use. Be sure to check the mod�s skies directory, located under /modname/gfx/env/ The skies will be named skynamebk, skynamedn, skynameft, skynamelf, skynamert, and skynameup. The suffix denotes the location in the 6-sided box of the image. Use the prefix (the �skyname� part) in the Map Properties cl_skyname section. Once you specify a sky and everything else is done, you�re all set. Go compile your map and check out the sky!