API Reference > geometry-core > Curve > CurvePrimitive > closestPoint closestPoint Method Search for the curve point that is closest to the spacePoint. If the space point is exactly on the curve, this is the reverse of fractionToPoint. Since CurvePrimitive should always have start and end available as candidate points, this method should always succeed closestPoint(spacePoint: Point3d, extend: VariantCurveExtendParameter): CurveLocationDetail | undefined Parameter Type Description spacePoint Point3d point in space extend VariantCurveExtendParameter true to extend the curve (if possible), false for no extend, single CurveExtendOptions (for both directions), or array of distinct CurveExtendOptions for start and end. Returns - CurveLocationDetail | undefined Returns a CurveLocationDetail structure that holds the details of the close point. Defined in core/geometry/src/curve/CurvePrimitive.ts Line 350 Last Updated: 13 June, 2024