how to interpolate a closed curve ?

I try like this:

first using rhinointerpcurve creat a curve,

and then using rhinomakecurveclosed make this curve closed

but the closed curve will not smoth at the start and end point.

# How to interpolate a closed curve

**NiceDay**#1

**Helvetosaur**#2

One optional argument for the CreateInterpolatedCurve method is CurveKnotStyle, choosing a “periodic” style should close the curve smoothly.

```
0 Uniform Parameter spacing between consecutive knots is 1.0.
1 Chord Chord length spacing, requires degree=3 with CV1 and CVn1 specified.
2 ChordSquareRoot Square root of chord length, requires degree=3 with CV1 and CVn1 specified.
3 UniformPeriodic Periodic with uniform spacing.
4 ChordPeriodic Periodic with chord length spacing.
5 ChordSquareRootPeriodic Periodic with square roor of chord length spacing.
```

–Mitch