API Reference > geometry-core > Polyface > PolyfaceBuilder > findOrAddNormalInLineString findOrAddNormalInLineString Method Announce normal coordinates found at index in the surfaceNormal array stored on the linestring findOrAddNormalInLineString(ls: LineString3d, index: number, transform?: Transform, priorIndexA?: number, priorIndexB?: number): undefined | number Parameter Type Description ls LineString3d index number Index of the point in the linestring. transform Transform priorIndexA number priorIndexB number Returns - undefined | number Returns the point index in the Polyface. Defined in polyface/PolyfaceBuilder.ts Line 415 Last Updated: 12 June, 2024