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==Major Features== ===Cardboard engine=== [[Cardboard]] is a floating-point rendering engine created by [[Doom Wiki:Stephen_McGranahan_(SoM)|SoM]] that fixes several problems inherent with the classic fixed-point [[Doom Wiki:Doom rendering engine|Doom rendering engine]]. ===EDF=== [[EDF]], which stands for Eternity Definition Files, is a textual input language that allows specification of almost all the static game data which was once contained inside the executable. This includes [[thingtype|thing types]], [[frame|frames]], sprites, terrain definitions, and more. EDF has a relaxed [[Wikipedia:C programming language|C]]-like syntax and can be used from both files and [[WAD]] lumps. ===ExtraData=== [[ExtraData]] is another EDF-like data specification language that allows the Doom map format to be extended with any kind of data. Use of special thing, line, and sector types within a map allows the editor to attach ExtraData records to those objects. Special data for the objects is then given inside the script. ===Linked portals=== [[Linked portals]] are surfaces that, like regular [[portals]], connect different areas of the map, but in addition can be walked through, thus allowing multistory maps to be designed in Doom. ===[[MapInfo]]=== Eternity expands SMMU's level info system significantly, allowing dozens of new properties to be specified, and allowing cascading global EMAPINFO lumps as an alternative to inserting MapInfo data into level headers. Among other things, MapInfo is used to tie ExtraData and ACS scripts to the maps that use them.
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