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Splines
Splines have been updated in AutoCAD LT 2011 to provide more flexibility and control. You can define a
spline using fit points or control vertices (CV). CV splines are more appropriate if you will be using them
with 3D NURBS (non-uniform rational b-spline) surfaces.
Figure 36. Fit spline and CV spline
When drawing a fit spline, you can specify additional settings for its start and end tangencies, tolerance
(how close the spline must come to the fit point), and knot parameterization (controlling the shape of
the curve as it passes through the fit point).
The only option for CV splines is Degree, which controls how many bends the spline can take in a given
span.
Figure 37. CV splines of varying degree