r.RayTracing.DecalGrid.Resolution
VarUnreal Engine Var console variable.
rRayTracingDecalGridResolution
Description
Controls the resolution of the 2D decal grid used to cull irrelevant decal from calculations (default = 256
Usage
r.RayTracing.DecalGrid.Resolution [value]Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.

