The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.
It's difficult to phrase it without sounding like I'm fanboying, but Source is the best game engine out there. The most important reason for this is organization.
The engine, engine branch, game, mod, and SDK file directories are very well organized.
Engine Branches: Half-Life 2 and the episodes all use the same engine branch, so they all share a directory.
In this case, the engine branch directory is
And the game directory for Half-Life 2 would be
The basic structure of a game's directory in one engine branch is virtually the same with all engine branches
If you find the file "gameinfo.txt" in:
Then you will most likely find a similar file in:
steam/steamapps/common/left 4 dead/l4d/
If you learn to mod one source game, then you also learn how to mod most of Valve's games so far, and probably most of Valve's games in the future.
This is one of the most powerful video game engines of all time!, and also has one of the best graphics of all time. And also one of the best video game titles has been made with this wonderful engine: Half Life 2, Grey, Nightmare House 2, Black Snow and most importantly, Black Mesa, the best video game made with the Source Engine. And in conclusion this video game engine was made by one of the the best video game companies of all time, Valve Corporation.