API Reference > geometry-core > Curve > CurvePrimitive > fractionToCurvature fractionToCurvature Method Returns the (absolute) curvature magnitude. Base implementation in CurvePrimitive computes curvature from the first and second derivative vectors. fractionToCurvature(fraction: number): undefined | number Parameter Type Description fraction number fractional position on the curve Returns - undefined | number Defined in curve/CurvePrimitive.ts Line 136 Last Updated: 12 June, 2024