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id Software releases Doom 3 source code

John Carmack rewrites code to avoid patent issues over "Carmack's reverse"

id Software has released the source code from its 2004 hit Doom 3.

Todd Hollenshead, president of id Software, made the announcement via his Twitter feed last night.

The source code was ready for release at the start of November, but there was a problem getting clearance from Bethesda's lawyers.

The sticking point was a shadow stenciling technique discovered independently by id co-founder John Carmack in 1997. Sometimes known as "Carmack's reverse", the technique was separately patented by Creative Labs in 2002.

However, rather than wait for the legalities to be ironed out, Carmack choose to rewrite the offending code instead.

The Doom 3 source code is currently available from GitHub.

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Latest comments (6)

Tom Keresztes Programmer 5 years ago
Knee deep in code ;)
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gi biz ;,pgc.eu 5 years ago
Patents patents... will humankind ever get rid of them?
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Edward Buffery Head of LQA (UK), Testronic5 years ago
Good old Carmack. "Oh yeah, I'd forgotten about independently inventing that patented technique. Here, let me just write another piece of code that also does exactly the same thing. It'll only take a minute..." Legend :)
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Show all comments (6)
Barrie Tingle Live Producer, Maxis5 years ago
Carmack is some kind of ninja programming machine.
Probably re-wrote the code on his lunch break on an iPad2 or something equally impressive :)
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Brian Smith Artist 5 years ago
Ipad2....? I hear Carmack has a wifi connection straight to his brain.... I also understand he has USB V3.0 somewhere but I'd hate to think where it plugs in.
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Ceyhun Alyesil IT Integration Manager, SHR Interaktif Servisler5 years ago
Cool news. I really love id tech. They are supporting open source community and young people for creating their own games.
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