Sharing the code just seems like The Right Thing to Do, it costs us ra — John D. Carmack

"Its a good thing Doom 3 is selling very well..."

"I think a lot of people may take some heart from this: a lot of the math, the heavy math in projective geometry, [...] took me a long time. There were many many years, a decade, when I was considered this graphics guru genius, when I really couldnt do from scratch [...] the mathematics that underpins a lot of that. But slowly, eventually, with a couple decades of experience, most of it did eventually sink in on me."

"These are things I find enchanting and miraculous. I don’t have to be at the Grand Canyon to appreciate the way the world works, I can see that in reflections of light in my bathroom."

"The Escalation programmers come from a completely different background, and the codebase is all STL this, boost that, fill-up-the-property list, dispatch the event, and delegate that. I had been harboring some suspicions that our big codebases might benefit from the application of some more of the various “modern” C++ design patterns, despite seeing other large game codebases suffer under them. I have since recanted that suspicion."

"A large fraction of the flaws in software development are due to programmers not fully understanding all the possible states their code may execute in."

"Personally, I’ve always been of the sleek and minimalist design school: make sure the core play is consistent and strong, then let that idea play out against different environments and challenges, this tends toward focusing on bio-mechanical twitch responses, audio-visual awe, and leaning more toward general strategy and tactics development over specific puzzle solving."