API Reference > geometry-core > Curve > CurvePrimitive > curveLengthWithFixedIntervalCountQuadrature curveLengthWithFixedIntervalCountQuadrature Method Run an integration (with a default gaussian quadrature) with a fixed fractional step This is typically called by specific curve type implementations of curveLengthBetweenFractions. For example, in Arc3d implementation of curveLengthBetweenFractions: If the Arc3d is true circular, it the arc is true circular, use the direct arcLength = radius * sweepRadians If the Arc3d is not true circular, call this method with an interval count appropriate to eccentricity and sweepRadians. curveLengthWithFixedIntervalCountQuadrature(fraction0: number, fraction1: number, numInterval: number, numGauss: number = 5): number Parameter Type Description fraction0 number start fraction for integration fraction1 number end fraction for integration numInterval number number of quadrature intervals numGauss number Returns - number Returns an integral estimated by numerical quadrature between the fractional positions. Defined in core/geometry/src/curve/CurvePrimitive.ts Line 193 Last Updated: 13 June, 2024