Source engine day/night cycle & dynamic weather

The position of the celestial bodies is dependent from season and clime. Right now the 2D skybox uses one texture with some overlays applied and a procedurally generated static mesh for stars. All weather effects, daytime, clime and season are synced between client and server. Weather is randomly applied based on the current climate and the time of day can be read from the hosts computer. Additional information: --------------------------- The shadowmapping code is written fro