API Reference > geometry-core > Curve > CurveChain > primitiveIndexAndFractionToCurveLocationDetailPointAndDerivative primitiveIndexAndFractionToCurveLocationDetailPointAndDerivative Method Evaluate an indexed curve at a fraction. Return as a CurveLocationDetail that indicates the primitive. primitiveIndexAndFractionToCurveLocationDetailPointAndDerivative(index: number, fraction: number, cyclic: boolean = false, result?: CurveLocationDetail): undefined | CurveLocationDetail Parameter Type Description index number fraction number cyclic boolean result CurveLocationDetail Returns - undefined | CurveLocationDetail Defined in curve/CurveCollection.ts Line 288 Last Updated: 12 June, 2024