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id Tech 3 is a game engine developed by id Software for Quake III Arena and has been used in many...

id Tech 3 is a game engine developed by id Software for Quake III Arena and has been used in many games under the Quake III Arena engine and Quake III: Team Arena engine branding. During its time, it competed with the Unreal engine; both engines were widely licensed. id Tech 3 is a substantial improvement from the Quake engine and id Tech 2. Although id Tech 3 was derived from the id Tech 2, a large portion of code was new or re-written. It was succeeded by id Tech 4, which was derived from id Tech 3, but had very little of the original code. At QuakeCon 2005, John Carmack announced that the Quake III source code would be released under the GNU General Public License (version 2), and it was released on August 19, 2005. The code can be downloaded from id's ftp site. id Tech 3 loads 3D models in the MD3 format. The format uses vertex movements (sometimes called per-vertex animation) as opposed to skeletal animation in order to store animation. The animation features in the MD3 format are superior to those in id Tech 2's MD2 format because an animator is able to have a variable number of key frames per second instead of MD2's standard 10 key frames per second. This allows for more