Id Tech 4
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id Tech 4 in Doom 3, the engine's parent game.
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| Developer(s) | id Software |
|---|---|
| Initial release | August 3, 2004 |
| Written in | C++ |
| Platform | Microsoft Windows, OS X, Linux, PlayStation 3, Xbox, Xbox 360 |
| Type | Game engine |
| License | GNU General Public License |
| Website | github |
id Tech 4, popularly known as the Doom 3 engine, is a game engine developed by id Software and first used in the video game Doom 3. The engine was designed by John Carmack. Carmack also created previous game engines, such as those for Doom and Quake, which are widely recognized as significant advances in the field. This OpenGL-based game engine has also been used in Quake 4, Prey, Enemy Territory: Quake Wars, Wolfenstein, and Brink.
id Tech 4 began as an enhancement to id Tech 3. During development, it was initially just a complete rewrite of the engine's renderer, while still retaining other subsystems, such as file access, and memory management. The decision to switch from C to the C++ programming language necessitated a restructuring and rewrite of the rest of the engine; today, while id Tech 4 contains code from id Tech 3, much of it has been rewritten.
At the QuakeCon 2007, John Carmack, the lead graphics engine developer at id, said to LinuxGames: "I mean, I won't commit to a date, but the Doom 3 stuff will be open source". And like its predecessors, John Carmack has said that id Tech 4 will be released as open source.
At the QuakeCon 2009, Carmack said that he planned to petition ZeniMax Media to release the id Tech 4 source upon the release of Rage. As part of his keynote for QuakeCon 2011 he confirmed that the source code to Doom 3 will be out by the end of the year, after the release of Rage.
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