Predecessors (id Tech 0)
id Software had developed 3D engines for several games before creating id Tech 1. Each game's engine had progressively more advanced 3D technology.
- Hovertank 3D (1991) used solid-color drawn walls and scalable sprites.
- Catacomb 3-D (1991) added texture mapping to the walls.
- Wolfenstein 3D (1992) increased the color palette from 16-color EGA to 256-color VGA. The game engine was also licensed out to other companies.
- Shadowcaster (1993) features diminished lighting, texture mapped floors and ceilings, walls with variable heights and sloped floors.
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