Apple Shake 4 - Manual (Page 750)

750 Chapter 25 Image Tracking, Stabilization, and SmoothCam
track1Name, track2Name…
The name of the track. To change the name, click in the text field and type a new name.
The number of tracks corresponds to the number of points you selected in the
trackType parameter. Each trackName parameter contains the following subparameters:
• track1X: The actual X value of the keyframed track point at that frame. Use this to
link a parameter to a track point. This parameter defaults to the expression width/3.
• track1Y: The actual Y value of the keyframed track point at that frame. Use this to link
a parameter to a track point. This parameter defaults to the expression height/3.
• track1Correlation: The correlation value representing how closely that keyframe
matched the original sample. A score of 1 is a perfect score. 0 is an unusable score.
• track1 Window Parameters: These multiple parameters control the windowing of the
tracking box, and are not relevant to exported values.
• track1CenterX: Determines the horizontal position of the track point. This
parameter defaults to the expression width/3.
• track1CenterY: Determines the vertical position of the track point. This parameter
defaults to the expression height/3.
• track1Visible: This parameter is the same as the visibility button that’s immediately
to the right of the trackName parameter, and toggles visibility of that tracker box
and its keyframes off and on.
• track1Enabled: If trackEnabled is not turned on, that tracker will not be used
during the next track analysis.
Tracker
The Tracker node is used only to generate and contain tracking information. Unlike the
MatchMove and Stabilize functions, it has no capability to alter the input image. As
such, the Tracker node is used to create tracks that are referenced either in other
tracking nodes or in non-tracking nodes such as Move2D, Rotate, and so on.
While MatchMove and Stabilize are limited to creating one, two, or four track points, the
Tracker node can hold as many trackers as you want. To add a tracker, click the Add
button at the bottom of the Parameters tab. If your workflow continually uses
Smoothing and Averaging of tracks for application in a Stabilize or MatchMove, you
should probably generate the tracking data using a Tracker node.
With the Tracker node, you can delete trackers, and save the tracks to disk. To save an
individual track, right-click that tracker’s trackName field, then choose Save Track from
the shortcut menu.
Warning: You cannot clone a Tracker node in the Node View using the Paste Linked
command.