2009

A visibility track appears below the selected object(s). Add and edit keys in
the visibility track to control the object's visibility.
To add visibility keys:
1 Once you have a visibility track assigned to the object, highlight the
track.
2
On the toolbar, click Add Keys.
3 On the Track View Key window, click in a visibility track to add a key at
that time location.
Example: To create and animate a visibility track using the Object Properties
dialog:
1 Create a box.
2
Turn on Auto Key.
3 Move the time slider to frame 10.
This is the frame at which you'll set the box to disappear.
4 Right-click the object and choose Properties from the shortcut menu.
5 In the General tab, set Visibility to 0, and then click OK.
6 Scrub the time slider.
The box fades. This creates a visibility track in Track View and adds a key
with a value of 0 to the track.
Move Keys (Dope Sheet)
Dope Sheet > Keys: Track View toolbar > Move Keys
Move Keys lets you reposition keys horizontally, within their own track(s),
thus changing the times at which they take effect. If no keys are highlighted,
you can move any key by dragging it. If multiple keys are highlighted, you
can move them all the same distance by dragging one of them.
Editing Keys | 3613