id Tech0 id Tech is the family of game engines designed and developed by id Software.0 Prior to the presentation of the id Tech 5-based game Rage, the engines lacked official designation and as such were simply referred to as the Doom and Quake engines, from the name of the main game series the engines have been developed for.0 id Tech numbers 1, 2, 3, and 4 have been released as free software under the GNU General Public License.
id Tech 00 id Software had developed 3D engines for several games before creating id Tech 1. Each games engine had progressively more advanced 3D technology.0 Hovertank 3D (1991) used solid-color drawn walls and scalable sprites.0 Catacomb 3-D (1991) added texture mapping to the walls.0 Wolfenstein 3D (1992) increased the color palette from 16- color EGA to 256-color VGA. The game engine was also licensed out to other companies.0 Shadowcaster (1993) features diminished lighting, texture mapped floors and ceilings, walls with variable heights and sloped floors.
Doom engine (id Tech 1)0 Originally developed on NeXT computers, later ported to MS-DOS for Doom’s initial release0 Commercial games using Doom engine 0 Doom – id Software 0 Doom II: Hell on Earth – id Software 0 Heretic – Raven Software 0 Hexen: Beyond Heretic – Raven Software 0 Strife – Rogue Entertainment
Quake Engine (id Tech 1)0 Less commonly, but also known as id Tech 1, the Quake engine is the game engine that was written to power 1996s Quake. It featured true 3D real-time rendering and is the first id engine to use the client–server model.0 Commercial games using Quake engine 0 Quake (1996) – id Software 0 HeXen II (1997) – Raven Software 0 Half-Life (1998) - Valve Corporation (Half-Life uses the GoldSrc engine, which is based on the engines for Quake and Quake II)
id Tech 20 Previously known as the "Quake II engine". id Tech 2 is based on the Quake engine, and features some enhancements such as colored lighting and a new model format. Game code is now written in C and loaded from a DLL, in place of the original Quake engines "QuakeC" scripting language.0 Commercial games using id Tech 2 0 Quake II – id Software 0 Heretic II – Raven Software 0 SiN – Ritual Entertainment 0 Soldier of Fortune – Raven Software
id Tech 30 Previously known as the "Quake III Engine", it was derived from id Tech 2, although a large portion of code is new or re-written.0 Commercial games using id Tech 3 0 Quake III Arena (1999) – id Software 0 Return to Castle Wolfenstein (2001) – Gray Matter Interactive (SP) / Nerve Software (MP) 0 Wolfenstein: Enemy Territory (2003) – Splash Damage 0 Star Wars Jedi Knight: Jedi Academy (2003) – Raven Software 0 Call of Duty (2003) – Infinity Ward i = 0x5f3759df - ( i >> 1 ); // what the fuck?
id Tech 40 Formerly the "Doom 3 engine", originally based on id Tech 3. It has a C++ based engine framework, and a new renderer, AI framework, physics engine, gameplay trigger system, and sound framework.0 Games using id Tech 4 0 Doom 3 (2004) – id Software 0 Quake 4 (2005) – Raven Software 0 Prey (2006) – Human Head Studios 0 Enemy Territory: Quake Wars (2007) – Splash Damage 0 Wolfenstein (2009) – Raven Software 0 Brink (2011) – Splash Damage 0 Prey 2 (2012) – Human Head Studios
id Tech 50 This is the engine being used for id Softwares new games.0 The engine is not based on any previous id Tech engines, however it reuses much of the technology from the most updated id Tech 4 engine, including MegaTexture technology, parallax mapping, bloom, motion blur, soft particles, soft shadows and pixel shader effects.0 Games using id Tech 5 0 Rage (2011) – id Software 0 Doom 4 – id Software
id Tech 60 id Tech 6 is an upcoming OpenGL-based game engine under preliminary development by id Software, which will tentatively follow id Tech 5 for id Software games following Rage and Doom 4. It will work by raycasting the geometry represented by voxels (instead of triangles) stored in an octree.