API Reference > geometry-core > Serialization > BGFBAccessors > BGFBAccessors.DgnRotationalSweep > axis axis Method axis(obj?: BGFBAccessors.DRay3d): | BGFBAccessors.DRay3d Parameter Type Description obj BGFBAccessors.DRay3d Returns - | BGFBAccessors.DRay3d DRay3d|null Defined in serialization/BGFBAccessors.ts Line 3893 Last Updated: 12 June, 2024