API Reference > geometry-core > Serialization > BGFBAccessors > BGFBAccessors.CatenaryCurve > vectorU vectorU Method vectorU(obj?: BGFBAccessors.DVector3d): | BGFBAccessors.DVector3d Parameter Type Description obj BGFBAccessors.DVector3d Returns - | BGFBAccessors.DVector3d DVector3d|null Defined in serialization/BGFBAccessors.ts Line 2371 Last Updated: 11 June, 2024