Here's a Thanksgiving gift for all those tweakers out there!
id Software has released the Doom 3 source code under the GPL3 license. John Carmack, founder and technical director of Id Software, broke the news on Twitter:
No game data is included, and Carmack's Reverse Algorithm (functionality enabling rendering of stencil shadows via the “depth fail” method) has been removed and coded around, but there's still plenty in here for coders to get their teeth into.
Long live Doom 3!