A spline is a smooth curve that passes through or near a given set of points. You can control how closely the curve fits the points.
The SPLINE（SPL） command creates a particular type of spline known as a nonuniform rational B-spline (NURBS) curve. A NURBS curve produces a smooth curve between control points.
You create splines by specifying points. You can close the spline so that the start and endpoints are coincident and tangent.
