IW engine

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IW engine
MW2 screen 1.PNG
The lighting, shadow, and texture streaming of the engine can be seen in this screenshot, taken from the multiplayer mode of Call of Duty: Modern Warfare 2.
Developer(s) Infinity Ward, Treyarch & Sledgehammer Games
Stable release IW6
Platform Microsoft Windows, Mac OS X, PlayStation 4, PlayStation 3, Xbox One, Xbox 360, Wii U, Wii
Type Game engine
License Proprietary

The IW engine is a game engine developed by Infinity Ward for the Call of Duty series. The engine itself is proprietary with inclusion of GtkRadiant by id Software. It has been used by Infinity Ward, Treyarch, Raven Software, and Sledgehammer Games.


The engine has arguably been distinct from the id Tech 3 engine on which it is based since Call of Duty 2 in 2005. The engine's name was not publicized until IGN was told at the E3 2009 by the studio that Call of Duty: Modern Warfare 2 would run on the "IW 4.0 engine".[1] Development of the engine and the COD games has resulted in inclusion of advanced graphical features while maintaining an average of 60 frames per second.

Call of Duty 4: Modern Warfare was released using version 3.0 of the engine. This game included features such as bullet penetration, improved AI, lighting engine upgrades, particle system enhancements and many more improvements. Treyarch began using an enhanced version of the IW 3.0 engine for Call of Duty: World at War.[2] Improvements were made to the physics model and dismemberment was added. Environments also featured more destructibility and could be set alight using the flamethrower. The flamethrower featured propagating fire and it was able to burn skin and clothes realistically. Treyarch, however, then modified the engine for their James Bond title, 007: Quantum of Solace.[3]

Call of Duty: Modern Warfare 2 was released using the IW 4.0 engine, the only game to do so. The IW 4.0 engine featured texture streaming technology to create much higher environmental detail without sacrificing performance. Call of Duty: Black Ops was not based on IW 4.0; rather, Treyarch further enhanced the version of IW 3.0 they had used in their previous game. This version of the engine also featured streaming technology, lighting enhancements, and support for 3-D imaging. Call of Duty: Modern Warfare 3 utilizes an improved version of the IW 4.0 engine. Improvements on the engine allow better streaming technology which allows larger regions for the game while running at a minimum of 60 frames per second. Further improvements to the audio and lighting engines have been made in this version.

Call of Duty: Black Ops II was developed using a further iteration of the IW engine.[4] Texture blending has been improved due to a new technology called "reveal mapping" which compares tones between two textures and then blends them together. Also, there have been upgrades to the lighting engine which include HDR lighting, bounce lighting, self-shadowing, intersecting shadows and various other improvements. Call of Duty: Black Ops II takes advantage of DirectX 11 video cards on the PC version of the game. The "zombie" mode has been moved to the multiplayer portion of the engine which will allow for much more variety within this part of the game.[5] Black Ops II was released on the 13th November 2012.

Call of Duty: Ghosts features an upgraded version of the IW 5.0 seen in Call of Duty: Modern Warfare 3. It is unknown at this time whether or not any engine features have been taken from Call of Duty: Black Ops II. Since the main developer is Infinity Ward they have returned to their original engine naming system and called this iteration IW6.[6] IW6 is compatible with next-gen systems such as Xbox One and PS4 so polygon counts, texture detail and overall graphical fidelity has been increased. IW6 is also compatible with Windows PC, Wii U, PS3 and Xbox 360. The IW6 Engine features technology from Pixar, SubD, which increases the level of detail of models as you get closer to them. Mark Rubin has also said about the HDR lighting "We used to paint it in and cover up the cracks, but now it's all real-time".[7] Ghosts will use Iris Adjust tech which allows the player to experience from a person's point of view how their eyes would react to changes in lighting conditions realistically. Other features include new animation systems, fluid dynamics, interactive smoke, displacement mapping and dynamic multiplayer maps. Ghosts was released on November 5, 2013.


Engine Name Release Year Upgraded from Change summary
Call of Duty id Tech 3 2003 Modified version of id Tech 3 from Quake III Arena
  • DirectX 9 driven renderer (base id Tech 3 engine was OpenGL driven)
Call of Duty 2 IW 2.0 2005 Modified version of id Tech 3 from Call of Duty
  • Normal mapping
  • Light bloom
  • Heat haze
  • Unified shadowing system
  • Game console support.
Call of Duty 4: Modern Warfare IW 3.0 2007 Call of Duty 2's IW 2.0 engine
  • Bullet penetration
  • Improved AI
  • Lighting engine upgrades
  • Particle system enhancements
  • "Ragdoll" physics integrated into character death animations.
  • Self-shadow every frame
Call of Duty: World at War IW 3.0 2008 Call of Duty 4: Modern Warfare's IW 3.0 engine
  • Audio occlusion.
  • Improved physics.
  • Ragdoll physics even after death animations.
  • Dismemberment
  • More destructible environments
  • Realistic burning of skin and clothing
  • Propagating fire
007: Quantum of Solace[8] IW 3.0 2008 Call of Duty 4: Modern Warfare's IW 3.0 engine
  • Cover system
Call of Duty: Modern Warfare 2 IW 4.0 2009 Call of Duty 4: Modern Warfare's IW 3.0 engine
  • Texture streaming technology
  • Improved AI
Call of Duty: Black Ops[9] IW 3.0 2010 Call of Duty: World at War's IW 3.0 engine
Call of Duty: Modern Warfare 3[11][12] IW 5.0 2011 Call of Duty: Modern Warfare 2's IW 4.0 engine
  • Improvements to texture streaming technology to allow for larger regions.
  • Lighting engine enhancements to show reflections of some objects on tile floors.
  • Improvements to the audio engine
Call of Duty: Black Ops II[13] IW 3.0 (Upgraded) 2012 Call of Duty: Black Ops's IW 3.0 engine
  • Reveal mapping (improved texture blending)
  • Improved water effects
  • Improved lighting effects
  • Lens flare effects
  • HDR lighting
  • Bounce lighting
  • Self-shadowing
  • Intersecting shadows
  • DirectX 11 for PC version
  • Improvements to the audio engine.
Call of Duty: Ghosts[14] IW 6.0[6] 2013 Call of Duty: Modern Warfare 3's IW 5.0 engine
  • Pixar's SubD (models sub-divide the closer the player gets to them)[7]
  • New animation systems for movement (sliding, leaning etc.)
  • Fluid Dynamics
  • Interactive Smoke
  • Improved AI
  • Advanced Fish AI
  • "Dynamic" multiplayer maps
  • Displacement mapping
  • True real-time HDR lighting
  • Iris Adjust tech
  • Graphics Tessellation for PC, PlayStation 4 and Xbox One
  • Advanced PhysX support for PC version
  • Specular mapping on particle effects
  • Using Umbra's advanced rendering technology.


  1. ^ Stead, Chris (2009-07-15). "The 10 Best Game Engines of This Generation". IGN. Retrieved 2010-05-24. 
  2. ^ "E3 2010: First Details Interview Part 2 HD". GameTrailers. May 28, 2010. Retrieved May 28, 2010. 
  3. ^ Ross Miller (2008-05-09). "New Bond game Quantum of Solace runs on COD4 engine, launching with movie". Joystiq. Retrieved 2008-05-10. 
  4. ^ Lamia, Mark (2014-05-12). "Black Ops 2: New engine isn't necessary - Treyarch". computerandvideogames.com. Retrieved 2012-05-14. 
  5. ^ Amrich, Dan (2012-05-01). "What I Know About Call of Duty: Black Ops II". One of Swords. Retrieved 2012-05-03. 
  6. ^ a b Dave Tach. "Infinity Ward, Call of Duty: Ghosts and the nameless game engine that powers a first-person shooter phenomenon". Polygon. Retrieved Jun 12, 2013. 
  7. ^ a b "Call of Duty: Ghosts exclusive first look". T3. Retrieved May 31, 2013. 
  8. ^ Ross Miller. "New Bond game Quantum of Solace runs on COD4 engine, launching with movie". Joystiq. Retrieved May 9, 2008. 
  9. ^ Matt Peckham. "Call of Duty: Black Ops Review Roundup". PC World. Retrieved Nov 9, 2010. 
  10. ^ "Deferred rendering vs forward rendering". Archived from the original on 2014-07-26. 
  11. ^ Marcus Yam. "Call of Duty: Modern Warfare 3 Engine Focused on Gameplay". Tom's Hardware US. Retrieved Sep 6, 2011. 
  12. ^ Bowling, Robert (2011-06-10). "IAm Robert Bowling, Creative Strategist on Modern Warfare 3 AMA". reddit. Retrieved 2012-05-04. 
  13. ^ Dan. "Mark Lamia discusses the Black Ops II engine". One of Swords. Retrieved May 14, 2012. 
  14. ^ Perry Vandell. "Call of Duty: Ghosts engine isn’t brand new, but upgraded". PC Gamer. Retrieved May 31, 2013.