Previously referred to as the 'Doom 3 Engine', Tech 4 is id Software's current licensing platform. Powering games such as Doom 3, Quake 4 and Enemy Territory Quake Wars, Tech 4 revolutionized the use of realtime dynamic lighting as well as other technologies.
About Doom III with 94 comments by Henley on Nov 23rd, 2011
On the 22nd of November the Doom 3 source code was released with a few changes and omissions.
The source also does not include functionality enabling rendering of stencil shadows via the "depth fail" method (commonly called "Carmack's Reverse"), which lawyers from parent company Zenimax said might infringe on a patent for a Creative Labs 3D shading technique.
You can find the download here on ModDB Moddb.com it is recommended however if you are reading this in a few months that you seek out any official versions due to it might be a more recent update.
Source: Gamasutra.com
Back at QuakeCon in 2009 John Carmack announced that the Doom 3 source code would be released at some point in the future. Confirmed today at two years later at the 2011 QuakeCon that the very same source code will be made available to everyone after id's next game RAGE releases later this year.
This means that a whole mess of modifications like the Dark Mod, Arx, Last Man Standing can release a almost indie version. It also means we might see some fantastic new endeavours being birthed because of this, maybe this will start another Team Fortress as we all know how well that worked out last time.
Source: Joystiq.com
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great engine
Watch this one, guys. I bet it goes opensource in a few years.
All of John Carmack's engines go open source eventually... Id tech 1, 2, and 3. Eventually 4 and even 5 will be open source. It's a tradition John Carmack is passionate about.