5.1.1

Chapter 22 Motion tracking 969
Important: To move the tracker positions independently of the foreground object, choose Mimic
Source from the Transform pop-up menu in the Behaviors Inspector. When Attach to Source is
chosen from the Transform pop-up menu, the foreground image is distorted when you drag the
trackers in the Canvas.
6 Click the Analyze button in the HUD or Behaviors Inspector.
The foreground object is pinned to the background element.
Note: If you adjust the Four Corner parameter for a layer and then apply a Match Move behavior,
the Four Corner parameter is applied in the behavior. If you delete the behavior, the four corner
settings for the layer remain. If you reset the Match Move behavior, the four corner settings
are reset.
Use Analyze Motion behavior to track points
You can also use the Analyze Motion behavior to record a four-point track. In this workow, the
four-point tracking data collected from the Analyze Motion behavior is loaded into a Match
Move behavior to corner-pin a foreground object.
1 Go to the frame where you want to start the track and apply an Analyze Motion behavior to the
background element.
By default, a single tracker appears in the Canvas.
2 Drag the tracker (Track 1) to a reference pattern in the top-left corner of the
background element.
Note: For four-point analysis, the trackers should be positioned in a clockwise order, starting
in the upper-left corner. This ensures the proper alignment of your element when the
transformation is applied.
Track 1
Track 2
Track 3
Track 4
3 In the Behaviors Inspector, click Add to add a second tracker, then drag the second tracker (Track
2) to a reference pattern in the top-right corner of the background element.
4 Add another tracker (Track 3) and drag it to a reference pattern in the bottom-right corner of the
background element.
5 Add another tracker (Track 4) and drag it to the reference pattern in the bottom-left corner of
the background element.
6 Click the Analyze button in the HUD or Behaviors Inspector.
The track is generated and its data is saved in the behavior.
Note: You can save tracking behaviors to the Library for later use.
7 Apply a Match Move behavior to the foreground element you want to corner-pin.
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