CUBICSPLINE
An interpolating cubic spline: the smoothest curve through all its points.
Syntax
CUBICSPLINE [points]
CUBICSPLINE @id,[points],closed,layer
| Argument | Meaning |
|---|---|
| [points] | The points it passes through, in order. |
| closed | TRUE for a smooth loop back to the first point (optional). |
The id, layer and any settings after it are the element settings.
Examples
P4=[250,500]
CUBICSPLINE [P0,P1,P2,P4,P3]

Notes
The same as the fit-point splines of other CAD programs. Every point shapes the whole curve; for one where a point changes only the curve near it, use CATMULLROM.