** Degree elevation** increases the degree of a curve

Select **Techniques** followed by
**Degree Elevation**. The degree of the
current curve will be increased by one. To increase the degree by more
than one, repeat this process.

The left figure below is a Bézier curve of degree 14. After performing degree elevation increasing its degree to 14, we have the right figure below. It now has 15 control points. Note that the shape of the Bézier curve does not change.

Degree elevation for B-spline and NURBS curves is performed by subdividing the curve into Bézier curve segments, increasing the degree of each Bézier segment, and combining them together back to a single B-spline and NURBS curve. So, increasing the degree of a Bézier curve is an important procedure.

The following left figure is a NURBS curve of degree 4 defined by 8 control points. After degree elevation, we have the right figure. It is of degree 5 defined by 12 control points.

If you are careful, you may have already found out that degree elevation will cause the set of control points modified "globally". More precisely, unlike knot insertion, all control points, except for the two endpoints, are replaced with new ones.