LOD groups define default level-of-detail settings as well as some options for globally modifying Static Meshes.
Groups are defined in the
[StaticMeshLODSettings] section of the
Engine.ini file. E.g.:
These settings define five LOD groups:
LOD groups may be added and removed without code modifications simply by editing the INI. Additional LOD groups will
automatically appear in the Editor UI. Meshes that are in groups that have been removed will use default settings
determined by code. Those default settings may also be overridden in the INI by defining the None LOD group.