API Reference > geometry-core > Curve > LineString3d > clonePartialCurve clonePartialCurve Method Return (if possible) a LineString which is a portion of this curve. This implementation does NOT extrapolate the linestring -- fractions are capped at 0 and 1. clonePartialCurve(fractionA: number, fractionB: number): undefined | CurvePrimitive Parameter Type Description fractionA number start fraction fractionB number end fraction Returns - undefined | CurvePrimitive Defined in curve/LineString3d.ts Line 1155 Last Updated: 11 June, 2024