API Reference > geometry-core > ArraysAndInterfaces > UVSurface > uvFractionToPointAndTangents uvFractionToPointAndTangents Method Convert fractional u and v coordinates to surface point and in-surface tangent directions. Remark: the vectors are expected to be non-zero tangents which can be crossed to get a normal. Hence the are NOT precisely either (a) partial derivatives or (b) frenet vectors uvFractionToPointAndTangents(uFraction: number, vFraction: number, result?: Plane3dByOriginAndVectors): Plane3dByOriginAndVectors Parameter Type Description uFraction number fractional coordinate in u direction vFraction number fractional coordinate in the v direction result Plane3dByOriginAndVectors optional pre-allocated carrier for point and vectors Returns - Plane3dByOriginAndVectors Last Updated: 11 June, 2024