Spline are the smooth curves passing through the given points.

To draw a Spline  you need to specify N points through which the curve needs to be passed. While you specify the points the points will be connected by straight lines as shown in figure below.

After you have finish with point input, a curve passing approximately through most of these points will be made. The curve made is tangential continuos at all the points. The figure below shows the spline made through the input points.

Fig 1. Selecting Points

Fig. 2 Spline

Steps :

See Also