- The main article for this category is Eternity Engine.
“MAPINFO is a lump introduced in Hexen which allows to describe meta-data associated to levels...MAPINFO
“The Eternity Engine is a GPL source port maintained by James "Quasar" Haley and Stephen "SoM...Eternity Engine
“Portals allow a map to have a geometry not normally possible in a "2.5D" engine such as Doom. A...Portal
“A 3D middle texture, often abridged as 3dMidTex, is a sort of simplified 3D floor without a...3D middle texture
“Slopes are an editing feature supported by some Doom source ports which allows the designer to...Slope
“EDF, or Eternity Definition File, is a content definition language in Eternity Engine that is...EDF