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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.
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