To Track Scale (Pro Only); To Animate Effects With Motion Tracking (Pro Only) - Adobe AFTER EFFECTS 7.0 Manual

Click Edit Target to open the Motion Target dialog box, which lists all the layers in the composition (except the
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motion source layer) as well as any point controls in effects applied to the motion source layer.
Select the layer or effect point control you want to animate, and click OK.
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In the Tracker Controls panel, click the Apply button to apply the tracking data to the specified target. After Effects
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creates keyframes for the target layer or effect.

To track scale (Pro only)

After Effects tracks scale much as it tracks rotation: Two track points are created with a line that connects the attach
point of each to the other; an arrow points from the first attach point (the base) to the second. After Effects calculates
scale by comparing the distance between attach points on each frame with the distance between the attach points on
the start frame.
If possible, you should place the feature regions on the same object, or at least they should both be on objects that
are the same distance from the camera. The farther apart the regions, the more accurate the calculations and the
better the result.
Select a tracker in the Timeline panel.
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Select Scale in the Tracker Controls panel. A second track point is added and connected to the first (base) track
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point. (If the tracker was already set up to track rotation, the Scale option uses the existing track points instead of
creating a new one.)
3 Adjust the track points in the Layer panel so that the line between their attach points lies along the length of the
feature you want to track.
Use the Analyze buttons in the Tracker Controls panel to begin tracking.
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5 Click the Apply button to apply the motion path to the motion target. After Effects creates scale keyframes and
copies them to the motion target.

To animate effects with motion tracking (Pro only)

You can animate effects applied to the motion source so that they follow a specific feature precisely throughout a
shot. After Effects repositions the effect point using the position data it gathered when tracking. For example, you
can track the sun as it moves across the sky to animate a lens flare. When applying tracking data to an effect point,
the motion target must be an effect point control on the same layer as the motion source.
In the Timeline panel, select the effect point control you want to animate.
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Note: The selected effect must be applied to the motion source layer, and the layer must include motion or changing
frames, such as video source footage.
Choose Animation > Track Effect Point Control. After Effects then performs the following actions:
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Displays the Tracker Controls panel with the current layer (the layer containing the effect) listed for Motion
Source and the effect point control you selected in step 1 for Motion Target.
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Creates a new track and displays its name for Current Track in the Tracker Controls panel.
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Displays Transform for Track Type.
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Adds the new track to the Motion Trackers section of the motion source layer in the Timeline.
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Creates a track point in the Layer panel for the motion source.
3 If you want to track a range of frames, define the work area you want to track in the Layer panel for the source
footage.
ADOBE AFTER EFFECTS 7.0
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User Guide