2013

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CVSHOW and CVHIDE determine whether the control vertices are displayed
on a spline even when the spline is not selected.
Use the triangular grip on a selected spline to switch between displaying
control vertices and displaying fit points. You can use the round and square
grips to modify a selected spline. For more information, see
Modify Splines
(page 274).
IMPORTANT Switching the display from control vertices to fit points automatically
changes the selected spline to degree 3. Splines originally created using
higher-degree equations will likely change shape as a result.
Create Splines Using Control Vertices
When you create splines using control vertices, the points you specify display
temporary lines between them, forming a control polygon that determines
the shape of the spline.
The advantage of changing the shape of a spline using control vertices is the
fine control this method provides. With this method, you can also specify
lower or higher degree polynomials, including degree 1 (linear), degree 2
(quadratic), degree 3 (cubic), and so on up to degree 10.
212 | Chapter 6 Create and Modify Objects