static void AppendStaticMesh ( const [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, const [TArray](API\Runtime\Core\Containers\TArray)< [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * > & Materials, const FTransform & StaticMeshTransform, [UGeometryCollection](API\Runtime\GeometryCollectionEngine\GeometryCollection\UGeometryCollection) * GeometryCollectionObject, bool ReindexMaterials )