Half-Life 2 Sky List
This is a list of skies available in the Steam caches, along with pictures of each skybox. The light_environment settings listed (Ideal Sun Angle, Ideal Brightness, etc) are suggestions based on settings used in official maps; other values may also be appropriate. To test skies in singleplayer without recompiling the map, bring up the console and enter sv_skyname <sky_name>. Quicksave the game, load it again and the old skybox should be temporarily replaced with the new one.
These skyboxes are available to 
 Half-Life 2 and most games and mods using the 
 Source. 
These skies are HDR capable if mapping for games that support it.
The table below explains the prefixes used in map filenames.
| Prefix | Location | 
|---|---|
d1_trainstation | 
		City 17 before the teleporter accident | 
d1_canals | 
		Route Kanal & Water Hazard | 
d1_eli | 
		Black Mesa East | 
d1_town | 
		Ravenholm | 
d2_coast | 
		Highway 17 | 
d2_prison | 
		Nova Prospekt | 
d3_c17 | 
		City 17 after the Nova Prospekt explosion | 
d3_citadel, d3_breen | 
		The Citadel | 
Only outdoor maps that have both skyboxes and light_environments are referenced by this list.
| Environment articles: | |
|---|---|
| Skies and environment maps | |
| Terrain and displacement mapping | Displacements • Creating Holes in Displacements • Digital Elevation Models • Creating custom terrain with Worldmachine |