TUniquePtr< FMeshDescriptionBulkData > MeshDescriptionBulkData
Bulk data containing mesh description. LOD0 must be valid, but autogenerated lower LODs may be invalid.
New assets store their source data here instead of in the RawMeshBulkData. If this is invalid, either the LOD is autogenerated (for LOD1+), or the asset is a legacy asset whose data is in the RawMeshBulkData.