API Reference > geometry-core > Curve > IntegratedSpiral3d > curveLengthBetweenFractions curveLengthBetweenFractions Method Return (unsigned) length of the spiral between fractions. Because TransitionSpiral is parameterized directly in terms of distance along, this is a simple return value. curveLengthBetweenFractions(fraction0: number, fraction1: number): number Parameter Type Description fraction0 number fraction1 number Returns - number Defined in curve/spiral/IntegratedSpiral3d.ts Line 302 Last Updated: 12 June, 2024