Adobe AFTER EFFECTS 5.5 Help Manual page 96

Adobe After Effects Help
Using Help | Contents
To collapse a layer outline heading:
Click the triangle to the left of the layer name so that it points to the right.
To expand or collapse all layer outline headings:
Select the layer and then press the grave accent (`) key.
Understanding keyframes
After Effects uses keyframes to create and control animation. (After Effects can also use
expressions to create and control animation. See "Using expressions" on page 244.) A
keyframe marks the point in time in a composition where you specify a value for a layer
property. Animation using keyframes requires at least two keyframes. After Effects creates
animation between keyframes by interpolating transition frames between each keyframe
using intermediate values based on the changing property values from one keyframe to
the next. A keyframe contains information on the type and speed of change between the
adjacent intermediate values.
Two Position keyframes and the interpolated frames in between create a motion path.
You can modify layer properties with or without setting keyframes. If you do not set
keyframes, or if you set only one keyframe, changes you make to the property value
remain in effect for the duration of the layer.
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Animating Layers
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