Highest resolution (in one dimension) allowed for a single static mesh asset, used to cap the memory usage of meshes with a large scaleChanging this will cause all distance fields to be rebuilt. Large values such as 512 can consume memory very quickly! (64Mb for one asset at 512)
Usage
r.DistanceFields.MaxPerMeshResolution [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.