Main toolbar > Open Track View > Track View toolbar > Edit Time > Exclude Left End Point
Graph Editors menu > Track View > Open Track View > Track View toolbar > Edit Time > Exclude Left End Point
Use Exclude Left End Point to exclude the beginning key in a selected block of time.
If you paste the same block of time repeatedly, one block following the other, you can create a looping segment in your animation. To create a smooth looping animation, you need to exclude either the first or last key of the copied block to prevent keys from doubling up at the ends.
The key to be excluded must be at the exact start or end time of the selected block of time.
Procedure
To create an animated loop:
On the Track View toolbar, click Edit Time.
On the Track View toolbar, select Exclude Left End Point.
In the Track View Hierarchy list, select the Position item label for the animated object.
Select a block of time.
For a smooth loop, the first and last frame of the selection should be the same.
On the Track View toolbar, select Copy Time.
The selection is copied to the clipboard (minus the first frame).
Click to define an insertion point.
The last position key should be your insert point.
Click Paste Time.
Interface
Exclude Left End Point: Prevents a key at the first frame of a selected block of time from being copied to the clipboard.