Reversing, Locking, and Disabling Keyframes
You can reverse keyframes to reverse the corresponding animated effect without
re-animating it. Further, you can lock keyframes (individually or in groups) if you have a
complicated curve and you want to prevent further adjustment. Finally, you can disable
an entire curve to suspend animation for that parameter.
To reverse keyframes
In the graph area Keyframe Editor, drag a bounding box to select the keyframes to reverse.
Control-click a selected keyframe, then choose Reverse Keyframes from the shortcut
The keyframes are reversed.
To lock keyframes
Select the keyframes to lock, then control-click a keyframe and choose Lock from the
Lock prevents further modification the keyframes.
Tip: You can also lock all keyframes in the Keyframe Editor by selecting “Lock keyframes
in time in Keyframe Editor” in the Time pane of Motion Preferences.
To disable a curve
Select the keyframes to disable, then Control-click a keyframe and choose Disable from
the shortcut menu.
Disabled keyframes are ignored and have no effect on the object’s animation. If you
disable a keyframe, the curve readjusts itself as if that keyframe didn’t exist, even though
the keyframe is present in the Keyframe Editor, in a dimmed state.