| gptkbp:instanceOf | gptkb:piston_engine 
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                                | gptkbp:audio | gptkb:MIDI digital sound effects
 
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                                | gptkbp:author | gptkb:John_Carmack gptkb:Paul_Radek
 gptkb:Dave_Taylor
 gptkb:John_Romero
 gptkb:Sandy_Petersen
 
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                                | gptkbp:category | gptkb:video_game gptkb:id_Tech_engine_family
 
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                                | gptkbp:developer | gptkb:id_Software 
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                                | gptkbp:firstReleased | 1993 
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                                | gptkbp:format | WAD 
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                                | gptkbp:genre | gptkb:first-person_shooter 
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                                | gptkbp:influenced | gptkb:Quake_engine Build engine
 Source ports
 
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                                | gptkbp:input | gptkb:joystick gptkb:keyboard
 gptkb:mouse
 
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                                | gptkbp:mainLanguage | C 
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                                | gptkbp:notableFeature | modding support 2.5D graphics
 BSP rendering
 WAD file support
 network multiplayer
 
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                                | gptkbp:notableFor | gptkb:Crispy_Doom gptkb:Doom_Legacy
 gptkb:Doomsday_Engine
 gptkb:PrBoom+
 gptkb:Boom
 gptkb:Chocolate_Doom
 gptkb:GZDoom
 gptkb:ZDoom
 
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                                | gptkbp:openSource | gptkb:GNU_General_Public_License 1997
 
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                                | gptkbp:platform | gptkb:Windows gptkb:MS-DOS
 gptkb:Mac_OS
 gptkb:Linux
 
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                                | gptkbp:successor | gptkb:Quake_engine 
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                                | gptkbp:technique | binary space partitioning ray casting
 
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                                | gptkbp:usedIn | gptkb:Hexen:_Beyond_Heretic gptkb:Strife:_Quest_for_the_Sigil
 gptkb:Doom
 gptkb:Doom_II:_Hell_on_Earth
 Heretic
 
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                                | gptkbp:bfsParent | gptkb:John_Carmack gptkb:Doom
 gptkb:Strife
 
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                                | gptkbp:bfsLayer | 6 
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                                | https://www.w3.org/2000/01/rdf-schema#label | Doom engine 
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