API Reference > geometry-core > Curve > LineString3d > moveSignedDistanceFromFraction moveSignedDistanceFromFraction Method Implementation of CurvePrimitive.moveSignedDistanceFromFraction. (see comments there!) Find the segment that contains the start fraction Move point-by-point from that position to the start or end (respectively for negative or positive signedDistance) Optionally extrapolate moveSignedDistanceFromFraction(startFraction: number, signedDistance: number, allowExtension: false, result?: CurveLocationDetail): CurveLocationDetail Parameter Type Description startFraction number signedDistance number allowExtension false result CurveLocationDetail Returns - CurveLocationDetail Defined in core/geometry/src/curve/LineString3d.ts Line 732 Last Updated: 13 June, 2024