There are two ways to represent splines in the Geometry section of the ShapeSheet. A SplineStart row followed by one or more SplineKnot rows. This representation fully supports formulas, but it does not include weights, so it is only good for non-rational splines. In either case, the first spline row must be preceded by another kind of row, such as a Start row, to indicate the first control point of the spline. The preceding row can be a LineTo, ArcTo, or EllipticalArcTo row if the spline follows a segment of that type.
All coordinates are local.
The Basics earlier in this article. The following table describes the values in SplineStart and SplineKnot row cells. All coordinates are local. The Basics earlier in this article. For example, if the spline has a degree of 3, the first four knots can have the same value.