Apple Shake 4 - Manual (Page 745)

Chapter 25 Image Tracking, Stabilization, and SmoothCam 745
trackRange
The trackRange parameter is the potential frame range limit of your track. By default,
the range is set to the clip range. For Shake-generated elements such as RGrad, it takes
a range of 1. You can set new limits using Shake’s standard range description, for
example, 10-30x2. If you stop tracking and start again, the process starts from the
current frame until it reaches the lower or upper limit of your trackRange, depending
on whether you are tracking forward or backward.
track1Name, track2Name…
The name of the track. To change the name, click in the text field and type a new name.
The number of trackXParameters 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.
Stabilize
The Stabilize node is a dedicated tracking node that locks down an image, removing
problems such as camera shake or gate weave. You can do one-point (panning), two-
point (panning, scaling, or rotation), or four-point (corner-pinning) stabilization. Tracks
can be generated in the Stabilize node, or can be read in. To read in a track, right-click
in the trackName text field, then choose Load Track from the shortcut menu.
Parameters
This node displays the following controls in the Parameters tab:
applyTransform
The foreground element is only transformed if applyTransform is active.