2009

13 Highlight the X Position track, and then right-click and choose Limit
Controller > Copy Limit Only.
14 Highlight the Y Position track, and then right-click and choose Limit
Controller > Paste Limit Only. When the Paste dialog opens, click OK to
confirm the paste as a copy.
Now the Y Position track is also limited, using the same extents as the X
Position track, but retaining its original underlying motion. To verify
this, compare the Y Position track with its child Limited Controller track.
Next, you'll copy the entire limited X Position track to the Z Position
track, including motion and limits. The Z Position track currently is not
animated.
15 Highlight the X Position track, and then right-click and choose Copy.
16 Highlight the Z Position track, and then right-click and choose Paste.
Compare the X and Z Position tracks and both their child Limited
Controller tracks. Each corresponding pair of curves is identical. The
motion appears as though the object is hitting the inside edge of a box.
Finally, we'll cover the Smoothing Buffer settings. By default, sharp corners
are created wherever a curve is limited, causing abrupt changes in motion.
You can smooth off these corners with the Smoothing Buffer parameters,
resulting in more natural-looking motion.
17 Highlight the X Position track, and then right-click it and choose
Properties.
This reopens the Float Limit Controller dialog.
18 Use the Upper Limit group > Smoothing Buffer spinner to increase the
Smoothing Buffer value as far as it can go.
As you increase the value, the corners of the upper limit on the graph
become smoother.
3188 | Chapter 15 Animation