> Doom3 is the proof that “keep it simple” works This statement suits even better to id Tech 3 (Quake 3). John Carmack mentioned: I still think the Quake 3 cod

> Doom3 is the proof that “keep it simple” works This statement suits even better to id Tech 3 (Quake 3). John Carmack mentioned: I still think the Quake 3 code is cleaner, as a final evolution of my C style, rather than the first iteration of my C++ style [Doom 3]: http://kotaku.com/thanks-a-few-comments-in-some-ways-i-still-think-the-454293019 http://kotaku.com/thanks-a-few-comments-in-some-ways-i-still... and he linked to his blog post about "Functional Programming in C++" on the now defunct but former popular AltDevBlog: https://web.archive.org/web/20130126164111/http://www.altdevblogaday.com/2012/04/26/functional-programming-in-c https://web.archive.org/web/20130126164111/http://www.altdev... The engine of Doom 3 (id Tech 4) was good. The game itself was repetitive and a bit boring. It was a few months late Aug 2004, and Far Cry 1 (March 2004) already overshadowed it in terms of graphics and gameplay. Licensing the id-Engine to other companies was very successful during the id Tech 2 (Quake 1/2) and id Tech 3 (Quake 3) era. Back then the Unreal engine was only used in Unreal and Unreal Tournament '99, with Deus Ex as an early adopter. But few games were released starting with id Tech 4 (Doom 3) and later id Tech 5 (Rage). Compromises during the development of id Tech 4+ meant it wasn't suitable for many different purposes. Only small levels with a few light sources were possible - the later "mega texture" addition partly solved that issue but meant a huge hardware step during development and prevented Mods and custom maps. In retrospect the Unreal 3+ and CryEngine 1+ offered comparable results without sacrifice their universalizability. http://en.wikipedia.org/wiki/Far_Cry_(video_game) http://en.wikipedia.org/wiki/Far_Cry_(video_game) , http://en.wikipedia.org/wiki/Doom_3 http://en.wikipedia.org/wiki/Doom_3 , http://en.wikipedia.org/wiki/Id_Tech_4 http://en.wikipedia.org/wiki/Id_Tech_4 The Call of Duty franchise is still using modified Quake 3 engine heavily extended with Ritual's ÜberTools, now named IW engine and comes with many modern features like texture streaming. Half Life 1+2 are based on a heavily modified Quake 1 engine. http://en.wikipedia.org/wiki/Quake_engine http://en.wikipedia.org/wiki/Quake_engine , http://upload.wikimedia.org/wikipedia/commons/6/63/Quake_-_family_tree.svg http://upload.wikimedia.org/wikipedia/commons/6/63/Quake_-_f... , http://en.wikipedia.org/wiki/File:Quake_-_family_tree_2.svg http://en.wikipedia.org/wiki/File:Quake_-_family_tree_2.svg , http://en.wikipedia.org/wiki/Heavy_Metal:_F.A.K.K.%C2%B2 http://en.wikipedia.org/wiki/Heavy_Metal:_F.A.K.K.%C2%B2 All of these id tech engine games can be edited with the GtkRadiant map editor (Half Life, Call of Duty, Quake 3, Doom 3, etc.): http://en.wikipedia.org/wiki/GtkRadiant http://en.wikipedia.org/wiki/GtkRadiant