Doom & Wolfenstein Game Engine books (free!)

http://fabiensanglard.net/gebb/index.html

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This is eerily well timed for reasons I can’t discuss.

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There’s a nice little discussion about fixed points starting on page 154, section 4.7.5.1 if anyone’s interested.

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I’ve read through these books some time back, very recommended. Another good old engine to study is the Build engine that ran 3D Realms games (Duke Nukem 3D, Blood, Shadow Warrior) – it has cool things like voxel model support.

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