At QuakeCon 2011, John Carmack, co-founder of id Software and perhaps better known as the programming mastermind behind its game engines, delivered his annual keynote address. With the game nearly finished and playable on the show floor, he focused his attention on Rage. Calling the game, "the most enjoyable id game, from my perspective, that we've ever made," Carmack went into some details about the long road its development took.

Carmack also talks about developing the game for multiple platforms, and some of the considerations that had to be made for consoles that are sure to rankle PC players. He takes questions in the later part of the address but don't get hopes up; another year passes without anything new on Doom 4.

Watch: John Carmack's entire Rage keynote at QuakeCon 2011 »

Though powered by the same id Tech 5 technology as id's open-world shooter Rage, Doom 4 will be

so detailed that it appears to run on "a totally new game engine," according to id co-founder and software engineer John Carmack.

The jump in graphical fidelity comes about as Doom 4 is targeted to run at 30 frames per second, whereas Rage will run at 60 frames per second. Carmack claims this allows id to throw "three times as much horsepower" at Doom 4. Read more »