API Reference > geometry-core > Curve > DirectSpiral3d > createPolishCubic createPolishCubic MethodStatic Create a polish cubic This is y= m*x^3 with m is 1/ (6RL) 1/(6RL) is the leading term of the sine series. L is nominal length R is nominal end radius. x ranges up to the x axis distance for which the polish distance series produces f(x)=L The support class PolishCubicEvaluator has static methods for the distance series and its inversion. createPolishCubic(localToWorld: Transform, nominalL1: number, nominalR1: number, activeInterval?: Segment1d): undefined | DirectSpiral3d Parameter Type Description localToWorld Transform nominalL1 number nominalR1 number activeInterval Segment1d Returns - undefined | DirectSpiral3d Defined in curve/spiral/DirectSpiral3d.ts Line 282 Last Updated: 11 June, 2024