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== Early development ==
===Conception===
Following the successful release of ''[[Wolfenstein 3D]]'' in May 1992, most of the id Software team worked on the sequel, ''[[Spear of Destiny]]''.<ref name="MOD"/>{{rp|98}} Since this game used {{wp|Wolfenstein 3D#Development|the same engine}} as Wolfenstein, lead programmer [[John Carmack]] could use the time to begin work on the company's next-generation [[Doom rendering engine|graphics engine]]. With significant effort, choosing to isolate himself from the rest of the team for a long period of time in order to avoid distractions, he implemented various new features, including varying light levels and {{wp|Texture mapping|texture-mapped}} floors and ceilings.<ref name="MOD"/>{{rp|99,100}} He even added support for sloping floors, although this feature was later abandoned. The engine was not initially developed with [[Doom]] in mind, and in fact Doom was not the first game to make use of it: [[Raven Software]] licensed an [[Raven engine|early version]] for ''[[Shadowcaster]]'', which would be published some months before Doom.<ref name="JRInt"/><ref name="MOD"/>{{rp|98}}

After the release of ''Spear of Destiny'' in September 1992, development began in earnest. The initial idea was to make a licensed game based on ''{{wp|Aliens (film)|Aliens}}'', one of the team's favorite science fiction-action films, and some negotiations were conducted with {{wp|20th Century Studios|20th Century Fox}}.<ref name="JRInt"/> This plan was eventually abandoned in order to retain more creative freedom.<ref name="MOD"/>{{rp|100}} John Carmack instead conceived of the basic theme for the game: demons versus technology. Doom was then imagined as a cross between ''Aliens'' and the team's favorite {{wp|B movie|B-grade}} {{wp|Horror film|horror}} movie, ''{{wp|Evil Dead II}}''.<ref name="JRInt"/><ref name="JCInt"/><ref name="MOD"/>{{rp|101}} The idea to include {{wp|Demon|demons}} was also inspired by the crew's most recent ''{{wp|Dungeons & Dragons}}'' campaign, which had ended with demons overrunning an entire planet.<ref name="MOD"/>{{rp|108}}

===Tom Hall and the Doom Bible===
[[File:Doom Bible Manila.jpg|thumb|right|300px|The original Doom Bible.]]
The horror-tech theme was not accepted unanimously. Creative director [[Tom Hall]] had instead wanted to continue the {{wp|Commander Keen}} series with a third trilogy, but the others felt that the cartoon style of the Keen games would not do justice to the new 3D engine.<ref name="MOD"/>{{rp|100}} Conceding defeat, Hall set out to create the new game's design document, which he titled the [[Doom Bible]], while the others were programming and creating graphics.<ref name="JRInt"/><ref name="MOD"/>{{rp|107}}

Unlike ''Wolfenstein 3D'', which had essentially been a plot-free shooter game, Hall wanted Doom to have an elaborate story.<ref name="MOD"/>{{rp|105}} The game was to take place on an alien moon or planet called [[Tei Tenga]], on which the UAAF (United Aerospace Armed Forces) had two military research bases. There would be four player characters with different personalities and abilities: Lorelei Chen, John "Petro" Pietrovich, Dimitri Paramo, and Thi Barrett (a fifth detailed character, Buddy Dacote, would disappear during the game's introduction). The game would start with creatures from [[Hell]] suddenly bursting in while the five were playing cards. There would be a total of six [[episode]]s, with story lines involving travel to Hell and back through the gates which the [[hellspawn]] used, and the destruction of Tei Tenga, for which the players would be sent to jail.

John Carmack disapproved of the detailed plot, instead imagining Doom as a simple, action-oriented game. He remarked, "Story in a game is like story in a porn movie. It's expected to be there, but it's not that important."<ref name="MOD"/>{{rp|105,108}} This creative conflict ended with the others agreeing that Hall's levels emphasized realism at the cost of making the game play entertaining. After increasing frustration with this situation saw Hall's productivity reduced, he was forced to resign in July of 1993.<ref name="MOD"/>{{rp|107,112-113}}

The Doom Bible as such was scrapped, but several of the ideas were kept for the final game. As in the Doom Bible, Doom starts in a military research base and features a trip to Hell and back, although Tei Tenga was replaced with [[Phobos]] and [[Deimos]], the moons of [[Mars]]. Several of the [[:Category:Locations|locations]], [[item]]s and [[monster]]s mentioned in the Doom Bible appear, though modified.

Some concepts from the Doom Bible, though discarded for Doom, made their way into later titles:
* The concept of "Hell on Earth" used for [[Doom II]] was originally spelled out in the Doom Bible.
* Instead of employing separate levels, Doom was initially supposed to use a "[[hub]]" system to enable a large, continuous world: the different areas would be connected by a {{wp|monorail}}. Hubs were later used in [[Hexen]] and in id Software's ''{{wp|Quake II}}'', and a monorail featured prominently in [[Doom 3]].
* The Doom Bible originally included interactive computer terminals; these first appeared in Doom 3.
* A weapon similar to the [[Unmaker]] from the Doom Bible was eventually realized in [[Doom 64]].
* Tom Hall used concepts from the Doom Bible in ''[[Rise of the Triad]]'' and ''{{wp|Terminal Velocity (video game)|Terminal Velocity}}'', which he designed after leaving id Software for Apogee Software and {{wp|3D Realms}}.
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