r.Shadow.AlwaysAllocateMaxResolutionAtlases
VarUnreal Engine Var console variable.
rShadowAlwaysAllocateMaxResolutionAtlases
Description
If enabled, will always allocate shadow map atlases at the maximum resolution rather than trimming unused space. This will waste more memory but can possibly reduce render target pool fragmentation and thrash.
Usage
r.Shadow.AlwaysAllocateMaxResolutionAtlases [value]Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.

