Apple Shake 4 - Manual (Page 728)

728 Chapter 25 Image Tracking, Stabilization, and SmoothCam
Tracking Shortcut Menu
Right-click in the text field of a trackName to open a shortcut menu with options for
manipulating your tracks.
Strategies for Better Tracking
Unfortunately, tracking is rarely a magic bullet that works perfectly on the first attempt.
This section discusses some strategies to help you get accurate tracks in various
situations.
trackNCorrelation The correlation value of that key to the original sample. A score of 1 is a
perfect score. 0 is a completely unusable score.
trackNWindow
Parameters These multiple parameters control the windowing of the tracking box, and are
not relevant to exported values.
Parameter Description
Menu Item Description
Copy/Paste The standard copy and paste commands.
Load Track Displays a list of all currently existing tracks. Select one, and a copy
of that track is loaded into both the X and Y parameters of the
current tracker.
Link Track Displays a list of all currently existing tracks. A link is made from the
current tracker to the tracker you select in the Select Track pop-up
window. Therefore, if you modify the tracker selected with the Link
command, the current tracker is updated. If you delete the tracker
you linked to, you lose your tracking data.
Average Tracks Displays a list of all tracks. Select up to four tracks that you want to
average together, then click OK. An expression is entered into the
current trackX and Y fields that links back to your averaged tracks.
You cannot choose to average your current track—it is deleted by
this action.
Smooth Track Displays a slider to execute a blur function on your tracking curves;
the smooth value is the number of keyframes considered in the
smoothing operation. To view the curves, open the trackName
subtree and click the Load Curve button to load the parameters
into the Curve Editor. If you use Smoothing and Averaging
operations as your standard workflow, it is recommended that you
generate your tracks first with the Tracker node, and then link the
tracks to a MatchMove or a Stabilize node.
Load Track File Loads a Shake-formatted track file from disk. See the end of the
tracking overview for the format of a track file.
Save Track File Saves a Shake-formatted track file to disk.
Clear Track Resets the current tracker. To reset the entire function, right-click an
empty area of the Parameters tab, then choose Reset All Values
from the shortcut menu.