Game Groups > 3D Engine: id Tech 1
Doom's source code was released to the public on December 23, 1997 under a license allowing noncommercial use; in 1999, it was re-released under the GNU General Public License. This led to the development of numerous source ports adding new features to the engine.
Some facts: * It was the first 3D game engine that allowed variable heights for floors and ceilings. However, it only allowed one floor or ceiling per area, making multi-storied levels impossible. * John Carmack experimented with 16 bit textures, but found the overhead unacceptable for the game.
- 3D Engine: Wolf3D
- BPjS / BPjM indexed games
- Game Engine: Adventure Game Studio (AGS)
- Gameplay feature: Auto-mapping
- Gameplay feature: Recordable replays
- Remastered releases
- Scripting language: Lua
- Software Pyramide releases
- Unofficial add-ons
- Unofficial add-ons for Doom games
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