Adobe AFTER EFFECTS 5.5 Help Manual page 122

Adobe After Effects Help
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Fine-tuning Animation
Controlling change through interpolation
After Effects provides several interpolation methods that affect how change occurs
through and between keyframes. For example, if you are setting up motion, you can
choose to make a layer change direction abruptly or smoothly through a curve. After
Effects interpolates values for a change using the values at the keyframes on both ends of
the change.
You can control temporal interpolation (the interpolation between keyframe values over
time) for all layer properties. For layer properties that involve movement, such as Position,
Anchor Point, Effect Point, and 3D Orientation, you can also control spatial interpolation
(the interpolation between motion-path keyframes through space).
When you make a layer property vary over time, After Effects records the resulting values
of temporal interpolation in the Value graph in the Timeline window. If the layer property
includes spatial interpolation, the resulting values of spatial interpolation are displayed as
a motion path in either the Composition or the Layer window, depending on the property.
You can add or delete keyframes in the Value graph or motion path using the pen tool.
Spatial interpolation and the motion path
When you apply or change the spatial interpolation for a property such as Position, you
adjust the motion path in the Composition window. The different keyframes on the
motion path provide information about the type of interpolation at any point in time.
A B
Motion path interpolation A. Linear B. Auto Bezier C. Continuous Bezier D. Bezier E. Hold
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Index
C D
Index
Fine-tuning Animation
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E
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