Spline object

A quadratic or cubic NURBS (nonuniform rational B-spline) curve.

A spline is a smooth curve passing through a given set of points. AutoCAD uses a particular type of spline known as a nonuniform rational B-spline (NURBS) curve. A NURBS curve produces a smooth curve between control points. Splines are useful for creating irregular-shaped curves, for example, drawing contour lines for geographic information system (GIS) applications or automobile design.

You create splines by specifying coordinate points. You can close the spline so the start point and endpoint are coincident and tangent. You can also change the spline-fitting tolerance. Fit tolerance refers to how closely the spline fits the set of fit points you specify. The lower the tolerance, the more closely the spline fits the points. At zero tolerance, the spline passes through the points.

To create a spline, use the AddSpline method. To edit or query a spline, use the following methods and properties: