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You can insert additional control vertices to a section of a spline to obtain
greater control in that section at the expense of making the shape of the spline
more complicated. The Refine option adds a knot to the spline resulting in
replacing the selected control vertex with two control vertices.
Edit Splines with SPLINEDIT
SPLINEDIT provides additional editing options, such as adding a kink to the
spline, and joining a spline to another contiguous object, such as a line, arc,
or other spline. As shown, objects are joined to splines with C0 continuity.
Edit Splines with 3DEDITBAR
3DEDITBAR displays a gizmo that can move a portion of a spline
proportionately, or change the direction and magnitude of the tangent at a
276 | Chapter 6 Create and Modify Objects