- The main article for this category is Eternity Engine.
“Below is a rough comparison of the source ports that are currently most popular. Note that the...Comparison of Doom source ports
“This page is about the source port. For other uses, see Eternity. The Eternity Engine is a GPL...Eternity Engine
“Skyboxes are different methods by which a fully 3D sky can be constructed (instead of the...Skybox
“Portals allow a map to have a geometry not normally possible in a "2.5D" engine such as Doom. A...Portal
“MAPINFO is a lump introduced in Hexen which allows to describe meta-data associated to levels...MAPINFO
“Slopes are an editing feature supported by some Doom source ports which allows the designer to...Slope
“A 3D middle texture, often abridged as 3dMidTex, is a sort of simplified 3D floor without a...3D middle texture