You can modify a spline using the SPLINEEDIT command, and you can also convert a spline into a polyline. In the following examples, we will learn how to do make modifications in a spline using the SPLINEEDIT command:

1. To start the SPLINEEDIT command, double-click on the spline or type SPE and press Enter; then click on the spline you want to modify.
2. Now, you will see lots of options on the command line. When you select the Close option from the command line, the spline will close from the open ends and will make a smooth closed spline. This option is especially good when you want to make a closed spline without any sharp points.

3. The Convert to Polyline option, as the name suggests, will convert the spline into a polyline. To do this, select the Convert to Polyline option and then specify a tolerance value. The higher the tolerance, the denser the polyline will be, and the more polyline segments will be used to convert the spline into a polyline. Also, a higher tolerance value will ensure that your polyline resembles the original spline more closely, but you will end up with a polyline containing lots of line segments.
4. A comparison of the polyline obtained from the same spline with a tolerance of 1 and a tolerance of 20 is shown in Figure 8.56:

So, this topic concludes our chapter. We have seen a lot of advanced tools and customization features in this chapter, and finally, let's have a look at the things we have covered so far in this chapter and the tools we will cover in the next chapter.