API Reference > geometry-core > Bspline > InterpolationCurve3dOptions InterpolationCurve3dOptions Class fitPoints and end condition data for InterpolationCurve3d This is a "typed object" version of the serializer-friendly InterpolationCurve3dProps Typical use cases rarely require all parameters, so the constructor does not itemize them as parameters. Methods Name Description constructor(fitPoints?: Point3d[], knots?: number[]): InterpolationCurve3dOptions captureOptionalProps(order: undefined | number, closed: undefined | boolean, isChordLenKnots: undefined | number, isColinearTangents: undefined | number, isChordLenTangent: undefined | number, isNaturalTangents: undefined | number, startTangent: undefined | Vector3d, endTangent: undefined | Vector3d): void One step setup of properties not named in constructor. clone(): InterpolationCurve3dOptions Clone with strongly typed members reduced to simple json. cloneAsInterpolationCurve3dProps(): InterpolationCurve3dProps Clone with strongly typed members reduced to simple json, with "undefined" members omitted reverseInPlace(): void reverse the order or sense of all start-to-end related properties. areAlmostEqual(dataA: undefined | InterpolationCurve3dOptions, dataB: undefined | InterpolationCurve3dOptions): boolean Static create(source: InterpolationCurve3dProps): InterpolationCurve3dOptions Static Clone with strongly typed members reduced to simple json. Properties Name Type Description closed Accessor ReadOnly boolean closed as property with default false endTangent Accessor ReadOnly undefined | Vector3d access POSSIBLY UNDEFINED end tangent. fitPoints Accessor ReadOnly Point3d[] access POINTER TO fitPoints isChordLenKnots Accessor ReadOnly number isChordLenKnots as property with default 0 isChordLenTangent Accessor ReadOnly number isChordLenTangent as property with default 0 isColinearTangents Accessor ReadOnly number isColinearTangents as property with default 0 isNaturalTangents Accessor ReadOnly number isNaturalTangents as property with default 0 knots Accessor ReadOnly undefined | number[] access POSSIBLY UNDEFINED knots array. order Accessor ReadOnly number order as property with default 4 (cubic) startTangent Accessor ReadOnly undefined | Vector3d access POSSIBLY UNDEFINED start tangent. Defined in bspline/InterpolationCurve3d.ts Line 50 Last Updated: 29 November, 2022