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created with 4 control vertices have the same shape as Bezier curves of degree
3 as shown on the right.
You can close a spline so that the start point and end point are coincident
and tangent. By default, closed splines are mathematically periodic, meaning
that they have the smoothest (C2) continuity at the point of closure.
In the example, both splines are closed, and the point of closure is marked
with a dot. The result of setting the SPLPERIODIC system variable to periodic
is shown on the left, while the result of the legacy setting is shown on the
right.
NOTE The legacy method for creating B-splines by creating a polyline, and then
using the Spline option of the PEDIT command generates only an approximate
"spline-fit" polyline.
See also:
Modify Splines
(page 245)
Break and Join Objects
Draw Construction and Reference Geometry
Construction lines and reference points are temporary objects you create to
help you draw accurately.
(page 241)
Create Objects | 189
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