Constructs an interpolation cubic spline going through the fit points. The constructed spline has start and end derivative specified by the input data.

Public Sub New(
    points As Point3dCollection, 
    startDerivative As Vector3d, 
    endDerivative As Vector3d
)

public CubicSplineCurve3d(
    Point3dCollection points, 
    Vector3d startDerivative, 
    Vector3d endDerivative
);