API Reference > geometry-core > Curve > TransitionSpiral3d > interpolateCurvatureR0R1 interpolateCurvatureR0R1 MethodStatic Given two radii (or zeros for 0 curvature) return the average curvature interpolateCurvatureR0R1(r0: number, fraction: number, r1: number): number Parameter Type Description r0 number start radius, or 0 for line fraction number r1 number end radius, or 0 for line Returns - number Defined in curve/spiral/TransitionSpiral3d.ts Line 118 Last Updated: 11 June, 2024