Using a Non-Match Move Four-Point Track for Corner-Pinning
This section provides an additional four-corner pin workflow that references a four-point
track from an Analyze Motion behavior. The four-point tracking data collected from the
Analyze Motion behavior is loaded into a Match Move behavior to corner-pin a foreground
object.
Note: You can also perform this workflow using the Stabilize behavior.
To record four-point tracking using Analyze Motion and apply the tracking data to a
Match Move behavior
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.
1308
Chapter 22
Motion Tracking
Note: For four-point Analyze Motion and Stabilize operations, 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 4
Track 3
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.
8
From the Action pop-up menu at the right of the Source well, choose the Analyze Motion
track.
Doing this applies the Analyze Motion tracking data recorded in step 6 to the Match Move
behavior.
9
Choose Four Corners from the Type pop-up menu in the HUD or Behaviors Inspector.
The four-point tracking data from the Analyze Motion behavior is applied to the foreground
object.
1309
Chapter 22
Motion Tracking
Note: When using the Match Move behavior for four-point tracking, the trackers are
placed in the correct order (clockwise from the top left) in the Canvas after Four Corner
is chosen from the Type pop-up menu in the Behaviors Inspector. If you’ve used more
than four trackers or you need to change the order of the trackers, choose a different
order from the Top Left, Top Right, Bottom Right, or Bottom Left pop-up menus.