Specifies the method used by the Progressive Lightmapper to reduce noise in lightmaps. (Editor only).
Options are None, Automatic, or Advanced.
This setting affects lightmaps generated by the Baked Global Illumination system. It applies only when using the Progressive Lightmapper.
When Unity serializes this LightingSettings object as a Lighting Settings Asset, this property corresponds to the Filtering property in the Lighting Settings Asset Inspector.
Additional resources: Lighting Settings Asset.