Game Engine

IW Engine
IW Engine is the game engine powering the Call of Duty Series.

It is used by many games, including: Call of Duty 4 was powered by the IW 4.0 engine. World at War, created by Treyarch, was also based on a modified and improved version of the IW 4.0 engine.
 * Call of Duty 2 (2005)
 * Call of Duty 4: Modern Warfare (2007)
 * Call of Duty: World at War (2008)
 * Quantum of Solace (2008)
 * Call of Duty: Modern Warfare 2 (2009, IW 4.0)
 * Call of Duty: Black Ops (2010)

Modern Warfare 2 was heavily improved on the IW 4.0 engine featuring texture streaming technology to create much higher detail in the environment.

Black Ops, in fact is not based on the Modern Warfare 2 engine but on the World at War engine, which itself was a improved version of Call of Duty 4's engine.

This resulted in the texture quality of Black Ops being slightly lower than that of Modern Warfare 2.