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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, who also created previous game engines, such as those for Doom and Quake, which are widely recognized as significant advances in the field.
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. [8] The source code was released on 22 November 2011 under GPL-3.0-or-later.
During the keynote address at QuakeCon 2011, John Carmack announced that the source code for the Doom 3 engine would be released. [54] The source code was open-sourced under the GNU GPL-3.0-or-later on November 22, 2011. It contains minor tweaks to the shadow rendering code to avoid potential patent infringement with a patent held by Creative Labs.
Consequently, many home grown projects have sprung up porting the code to different platforms, cleaning up the source code, or providing major modifications to the core engine. Wolfenstein 3D, Doom and Quake engine ports are ubiquitous to nearly all platforms capable of running games, such as hand-held PCs, iPods, the PSP, the Nintendo DS and more.
The source code to the Linux version of Doom was released to the public under a license that granted rights to non-commercial use on December 23, 1997, followed by the Linux version of Doom II about a week later on December 29, 1997. [4] [5] The source code was later re-released under the GNU General Public License v2.0 or later on October 3, 1999.
It was created by Chi Hoang, who took the original Linux release of the Doom source code and ported it back to DOS. [76] It evolved to include several new features, which were previously unseen at the time shortly after the release of the original Doom source code, including translucency, high resolution and color rendering, and vertical aiming ...
The source code of Doom 3: BFG Edition ' s game engine was released under the GNU GPL-3.0-or-later on November 26, 2012. On June 4, 2015, Doom 3: BFG Edition was released for Nvidia Shield Tablet and Nvidia Shield TV without online multiplayer.
id Software has since publicly released the source code to Quake in 1999, Quake 2 in 2001, Quake 3 in 2005 and lastly Doom 3 in 2011 (and later the BFG Edition in 2012). The source code for Hovertank 3D and Catacomb 3D (as well as Carmack's earlier Catacomb) was released in June 2014 by Flat Rock Software with Carmack's blessing.