Select Modify Spline from the Edit menu, and then select a parametric spline in the graphics window.
Modify Spline ribbon bar
| Use this ribbon bar to maintain tangency conditions when editing parametric splines. The End point 1 tangent and End point 2 tangent buttons let you select each end-point tangency separately.
For example, the following illustration shows a line that is tangent to one end point of a parametric spline:
By clicking the End point 1 tangent button, you can move the spline without removing its tangency to the line, as shown here:
If you move the spline without maintaining its tangency, the result looks like this:
Note: The Modify Spline ribbon bar displays only for parametric splines. Shortcut Keys 1 – End point 1 tangent 2 – End point 2 tangent
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