Sky
Introduction:
Sky is very important, it helps create an atmosphere in our maps and is very easy to change to your liking even while in game.
Step 1:
Find a sky you like by typing 'sky xx' in console, xx being one of the skies below while in game test running your map.

CP - Crystal Palace
A nice night sky with fog on the bottem instead of water.

HL - Half-Life
Same as TY sky, just brown and less buildings.

PV - Poisonville
To be used in dock type maps or if it is raining even harder.

RC - Radio City
A nice night time sky map with buildings in the distance on other sides.

SR - Skid Row
The default sky map, use this only if you really want to because it is seen too often.

ST - Steel Town
As seen in steeltown maps when the sun goes down that gives off a beautiful orange/red color.

TY - Train Yards
Same as HL sky, just grey and more buildings.