Doom 3 and the Tech 4 engine have been open sourced by id Software.

The source code to the game, which uses the id Tech 4 engine, has been published under the GPL license. The code is hosted on Github.

Plans for the Doom 3 source code to be open-sourced have long been known, but held up by legal issues affecting various elements within the game and its code. Because of this Doom3 GPL does not ship with the “Carmack’s Reverse” shadow technique.

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Doom 3 and the Tech 4 engine have been open sourced by id Software. The source code to the game, which uses the id Tech 4 engine, has been published under the GPL license. The code is hosted on Github. Plans for the Doom 3 source code to be open-sourced have long been known, but held up by legal ...