Adobe AFTER EFFECTS 5.5 Help Manual page 141

Adobe After Effects Help
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Using the Time-Reverse Keyframes keyframe assistant
For any property in a layer, you can select a range of keyframes and reverse their order. For
example, you can reverse keyframes in the Position property to reverse the motion of an
object. You can select and reverse keyframes across multiple layers and properties, but
each set of keyframes for a property is reversed only within its original time range, not that
of any other selected property. Markers in the Timeline window are not reversed, so you
may need to move markers after reversing keyframes.
Original property values
Scale property values reversed using the Time-Reverse Keyframes keyframe assistant
To reverse keyframes:
1 In the Timeline window, select a range of keyframes you want to reverse.
2 Choose Animation > Keyframe Assistant > Time-Reverse Keyframes.
For information on reversing the direction in which a layer plays and changing the order of
the keyframes, see "Reversing the playback direction of a layer" on page 141. For infor-
mation on reversing the direction in which a layer plays without changing the order of the
keyframes, see "About time-remapping" on page 142.
Reversing the playback direction of a layer
You can easily reverse a layer's playback direction. When you do, all keyframes for all
properties on the selected layer also reverse position relative to the layer. The layer itself
maintains its original In and Out points relative to the composition.
Note: For best results, replace the layer with a composition having the same frame size as
the layer, and reverse the layer inside the composition. This is the most accurate way to
reverse footage. For more information on nesting compositions, see "Organizing a project
using nesting" on page 265.
To reverse a layer's playback direction:
1 In a Timeline window, select the layer you want to reverse.
2 Press Ctrl+Alt+R (Windows) or Command+Option+R (Mac OS).
Note: You can also play a layer backward by typing a negative time-stretch value in the
Time Stretch dialog box.
To reverse the order of keyframes without reversing the layer's playback direction, select
keyframes and choose Animation > Keyframe Assistant > Time-Reverse Keyframes (see
"Using the Time-Reverse Keyframes keyframe assistant" on page 141).
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