r.Nanite.Builder.FallbackTriangleThreshold
VarUnreal Engine Var console variable.
rNaniteBuilderFallbackTriangleThreshold
Description
Triangle count <= to this threshold uses the source mesh unchanged as the fallback.
Usage
r.Nanite.Builder.FallbackTriangleThreshold [value]Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.

