Caverns of Darkness


Caverns of Darkness is a 12-level mapset for Doom 2 by The Chaos Crew in 2002, using a custom source port, based on the Eternity Engine v3.29 called the "COD Engine" whose source code was released on May 4, 2002 by Christopher Lutz. Despite this, the source code was long considered lost, until it was re-released on May 26, 2019 by Joel Murdoch and on January 31, 2020 on the idgames archive. Because of the custom engine, MS-DOS or a DOS emulator such as DosBox is required to play. The modification is well known for its liberal use of fake three-dimensional constructs using middle textures, and ambient sounds.

ZDoom version[edit]

Graf Zahl first supplied a custom build of ZDoom to play Caverns on January 23, 2005. Entitled zdoom-cod.exe, it was a custom source modification derived from ZDoom 2.0.96 with the necessary additions to play the mapset. Later on November 15, 2008, he released a separate patch for Caverns of Darkness, allowing it to be played using regular ZDoom. It works by substituting DECORATE actors in place of the original hard-coded custom thing types and weapons, as well as using MAPINFO to use a custom map translator to account for the COD engine's new sector and linedef types.



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