Changes

==Previous implementations==

The idea for fake contrast predates Doom and extends back to the earliest [[id Software]] first-person shooters. In {{wp|Hovertank 3D}}, a simple flat-shaded raycasting engine, walls in alternate directions are shaded a darker or lighter shade to create contrast. In its texture-mapped successors, [[Catacomb 3D]] and [[Wolfenstein 3D]], this is accomplished using texture themes with matching lighter and darker versions of textures that can be assigned to the different faces of each cell.

Hovertank 3D screen.png|Fake contrast achieved through flat shading in Hovertank 3D.

Catacomb 3-D The Descent screenshot.png|Fake contrast accomplished via texturing in Catacomb 3D.