API Reference > geometry-core > Curve > TransitionSpiral3d > averageCurvatureR0R1 averageCurvatureR0R1 MethodStatic Given two radii (or zeros for 0 curvature) return the average curvature averageCurvatureR0R1(r0: number, r1: number): number Parameter Type Description r0 number start radius, or 0 for line r1 number end radius, or 0 for line Returns - number Defined in curve/spiral/TransitionSpiral3d.ts Line 110 Last Updated: 12 June, 2024