API Reference > geometry-core > Bspline > InterpolationCurve3dProps InterpolationCurve3dProps Interface fitPoints and end condition data for InterpolationCurve3d This is a "json compatible" version of the serializer-friendly InterpolationCurve3dOptions Properties Name Type Description closed undefined | boolean true if the bspline construction should be periodic endTangent undefined | XYZProps optional end tangent. fitPoints XYZProps[] Points that the curve must pass through isChordLenKnots undefined | number isChordLenTangent undefined | number isColinearTangents undefined | number isNaturalTangents undefined | number knots undefined | number[] knots for curve fitting order undefined | number Order of the computed bspline. startTangent undefined | XYZProps optional start tangent. Defined in bspline/InterpolationCurve3d.ts Line 25 Last Updated: 29 November, 2022