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Quake Engine
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[edit] Games and Engine Association
These games have a common game engine origin, the famous Quake Engine (id Tech1). Half-life branched from the id Tech tree right after valve bought a license for the first one of the series. Soldier of Fortune uses the id Tech 2 and the id Tech 3 (for double helix). The Call of Duty series went from using a highly modified id Tech 3 engine, (based of the customized version by Splash Damage), to a totally new engine in its latest iteration. Doom and Quake share a common destiny, as are id Software, internally developed, games.
If you are serious about modding and Mapping for the Call of Duty Series, then you should have a look at the history of the game engine. It does help, as the underlying logic hasn't changed much over the past decade, even with the advancement of the graphical technology involved (specially the move from OpenGL based render to DirectX).
The very fact is that a lot of moddifications that were created for Quake and quake-based games can be easily ported to Call of duty. In the same manner it is fairy trivial to port a map originally created for a game in the 'series' to a more recent one, than for an example porting a Unreal map to a Quake engine based game. Not that the latest iteration of Call of Duty is per say a game running on top of the Quake engine, but due to the close relation between the engine behind the Call of Duty games and the engine originated from id, it merely requires you to reformat the source content of the port to have it running in the newest game, as opposed to rebuild from scratch and being able to think into two different logical systems.
[edit] Quake Engine and Descendant Family Tree
[edit] Technology used
Binary Partition Tree
