Types Of Tracking (Pro Only) - Adobe AFTER EFFECTS 7.0 Manual

ADOBE AFTER EFFECTS 7.0 333
User Guide
For example, if you wanted to animate a flying saucer hovering over an undercover spy, you would position the
feature region on a small, distinct area on the spy. If you left the attach point centered in the feature region, the saucer
would be attached to that point (and would appear to have already landed on the spy). However, if you wanted the
saucer to appear to be in pursuit, you would move the attach point out of the feature region to be somewhat above
and behind the spy.
Attach point centered in feature region
Attach point offset from feature region
Adjust a tracker's Attach Point Offset property in the Timeline panel to move the attach point in the Layer panel. The
offset can be particularly useful when using corner pinning on footage in which the feature and the desired location
of the attach point are moving relative to one another.
See also
"About animation and layer properties" on page 188

Types of tracking (Pro only)

When setting up motion tracking, you can choose from one of five different tracking types in the Track Type menu
in the Tracker Controls panel, depending on what you want to track.
When you choose Stabilize Motion, the default tracking type is Stabilize. When you choose Track Motion, the default
tracking type is Transform if the composition contains multiple layers, or Raw if the composition contains a single
layer.
Tracks position and/or rotation to apply to another layer. When tracking position, this option creates one
Transform
track point and generates position keyframes. When tracking rotation, this option creates two track points and
produces rotation keyframes.