API Reference > geometry-core > Polyface > PolyfaceBuilder > findOrAddParamInLineString findOrAddParamInLineString Method Announce param coordinates, taking u from ls.fractions and v from parameter. The implementation is free to either create a new param or (if known) return index of a prior point with the same coordinates. findOrAddParamInLineString(ls: LineString3d, index: number, v: number, priorIndexA?: number, priorIndexB?: number): number | undefined Parameter Type Description ls LineString3d index number Index of the point in the linestring. v number priorIndexA number priorIndexB number Returns - number | undefined Returns the point index in the Polyface. Defined in core/geometry/src/polyface/PolyfaceBuilder.ts Line 442 Last Updated: 13 June, 2024