API Reference > geometry-core > Bspline > BSpline2dNd > fractionToPointAndDerivatives fractionToPointAndDerivatives MethodAbstract abstract declaration for evaluation of (unweighted) 3d point and derivatives. Derived classes must implement to get fractionToRigidFrame support. fractionToPointAndDerivatives(_fractionU: number, _fractionV: number, _result?: Plane3dByOriginAndVectors): Plane3dByOriginAndVectors | undefined Parameter Type Description _fractionU number u parameter _fractionV number v parameter _result Plane3dByOriginAndVectors optional result. Returns - Plane3dByOriginAndVectors | undefined Defined in core/geometry/src/bspline/BSplineSurface.ts Line 269 Last Updated: 13 June, 2024