FogOfWar

Flag:	FogOfWar
File(s):	Maps, rules(md).ini (RA2/YR only)
Values:	Boolean values: yes or no, true or false, 1 or 0
Default:	no
Applicable to:	SpecialFlags, MultiplayerDialogSettings

Determines whether Fog of War is enabled. The fog differs from the usual opaque, black shroud in that it's semi-transparent and automatically regrows over time. Terrain and buildings are visible through the fog, but units and animations are not. Building sprites will also linger on the fog even if the buildings themselves are destroyed, until the area is re-explored. These factors can alter the flow of the game significantly.

Despite listed under [General] in Tiberian Sun and Firestorm, this flag is only read from [SpecialFlags] in those two games. In Red Alert 2 and Yuri's Revenge, it is also parsed from [MultiplayerDialogSettings].

FogOfWar in Yuri's Revenge

Bugs/Side-Effects/Unexpected Limitations

The Fog of War is notoriously prone to crashes due to frequent out of bound surface blits. These crashes have since been fixed in modern DirectDraw wrappers like CNC-DDraw and TS-DDraw.

There are also minor bugs/side-effects like animated terrain objects (e.g. blossom trees, ore drills) becoming invisible under the fog.