As Promised, id Software has released the source code for the recent BFG Edition release of their hellish first person shooter Doom 3, allowing modders to play around with its still quite technically-impressive bits and pieces. The GPL source code can now be found on GitHub, alongside the inner workings of id's other past accomplishments.

Bethesda's Bethblog announcement also reveals that a patch for Doom 3: BFG Edition has now also rolled out on Steam, bringing with it a raft of new technical features:

NEW FEATURES

• All projectiles cast shadows
• Texture LOD bias added to menu options
• Added option to force v-sync (instead of “smart v-sync”)
• Adjusted default brightness value
• Shadow casting projectiles added to menu options
• Allow setting anti-aliasing up to 16x on Nvidia hardware. AMD/Intel cap is at 8x
• Adjusted range of vertical sensitivity (allows you to lower sensitivity further than original implementation)
• Added option to disable checkpoints
• Allow left/right to enter resolution menu
• Variable FOV settings options were added into the main menu
• Added controller bind options
• Added additional anti-cheat measures

Doom 3: BFG Edition will also be the first game to support the hotly anticipated Oculus Rift head-mounted display, which is still scheduled to start shipping to Kickstarter backers in December.