id Tech 5 is a proprietarygame engine developed by id Software. It follows its predecessors, id Tech 1, 2, 3and 4, all of which have subsequently been published under the GNU General Public License. It was seen as a major advancement over id Tech 4. The engine was first demonstrated at the WWDC 2007 by John D. Carmack on an eight-core computer; however, the demo used only a single core with single-threaded OpenGL implementation running on a 512 MB 7000 class Quadrovideo card. id Tech 5 was first used in the video gameRage, followed by ', The Evil Within and '. It was followed up by id Tech 6.
Features
The initial demonstration of the engine featured 20 GB of texture data, and a completely dynamic and changeable world. This technique allows the engine to automatically stream textures into memory as needed, meaning that developers need not concern themselves with memory restraints or texture limits. This has the advantage of simplifying the creation of content, by eliminating the need to adapt content for different platforms. The engine automatically optimizes resources for cross-platform development, making it possible to render the same models on different platforms, while creating them for only one platform, further simplifying cross-platform development. One of the visually evident features the renderer included is a penumbra in the shadowing, by using shadow maps. In contrast, id Tech 4, which featured volume-based shadows, had very sharply defined shadows. Numerous other advanced graphical effects such as various materials for lighting, high dynamic range rendering-centric effects, bloom, crepuscular rays, radiosity, soft particles, pixel shader effects, alpha to coverage, post processing, Screen Space Reflection, dynamic water surfaces, procedural animation, cloth simulation, depth of field, and motion blur, are contained. Multi-threaded processing on the CPU is done for many of its tasks, including rendering, game logic, AI, physics, and sound processing. The engine comes with a content-creation tools package called id Studio, which is supposed to be much more user-friendly and polished than in earlier versions. Previously, content creation required artists to run various command-line tools beyond the level editor's own tools, while id Tech 5 allows for all work to be done 'in-engine'. While id Software will be using the engine solely for creating shooter games, the engine also has the capability to operate outside of this genre. Steve Nix from id Software stated that "Not only do we think people can make games outside the action-shooter space with our technology, we encourage it. We'd actually like to see those games made."
Marketing and licensing
The engine was first publicly shown during the 2007 Apple Worldwide Developers Conferencekeynote address, then was later shown privately to an audience of potential licensees at E3 2007. The first public demonstration focusing exclusively on the engine took place at QuakeCon in the same year during the annual keynote held by John Carmack. An interview with John Carmack, the lead graphics engine developer at id, indicated that like its predecessors, id Tech 5 would eventually be released as open-source. The move to open source would likely come many years after id Tech 5's release as a proprietary engine. At QuakeCon 2007, Carmack told LinuxGames that he would integrate as little proprietary software as possible into id Tech 5, as "eventually id Tech 5 is going to be open source also. This is still the law of the land at id, that the policy is that we’re not going to integrate stuff that’s going to make it impossible for us to do an eventual open source release." Carmack resigned from id in 2013, and no source code release followed the launch of id Tech 6 in 2016. At QuakeCon 2010, id CEO Todd Hollenshead announced that while id Tech 5 could be shared with internal ZeniMax Media developers, the engine will not be available for external licensing. On November 10, 2010 it was announced that the first ZeniMax internal developer to work with the engine would be MachineGames.
