Determines whether or not to store imposter info (position.xy in UV2, position.z + scale in UV3) in the merged mesh UV channel0: Do not store imposters info in UVs (default1: Store imposter info in UVs (legacy
Usage
r.MeshMerge.StoreImposterInfoInUVs [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.