Apple Shake 4 New Features - Manual (Page 50)

50 Chapter 2 Major Features and New Nodes
Note: If you want to create a curve specifically to use with the Node Retime command,
you can create a local variable within the RotoShape Parameters tab, load it into the
Curve Editor, and create a curve expression which you can then copy and paste from
the local variable into the Retime Expr field.
Attaching Trackers to Individual Control Points
You can attach separate trackers to each of a shape’s individual control points. You can
attach as many trackers to as many separate control points as you like.
To attach an existing track to a single control point:
1 Select a shape control point in the Viewer.
2 Right-click the selected points, then choose a tracker from the “Attach tracker to
selected CV’s in current shape” shortcut submenu.
The selected tracker now animates the position of that control point. The offset
between the position of the track and the original position of the shape control point is
maintained as the point is animated along the path of the tracker.
You can also create a new Tracker node that is referenced by a specific control point.
To create a new Tracker node attached to one or more control points:
1 Select one or more points in the Viewer.
2 Right-click one of the selected points, then choose “Create tracker for selected points”
from the shortcut menu.
3 Attach the new tracker to the image you want to track, and use the tracker’s controls to
track the desired feature.
4 The control point you selected in step 1 automatically inherits the tracking data.
To remove a tracker from one or more control points:
1 Select one or more shape control points in the Viewer.
2 Right-click one of the selected points, then choose “Remove tracker reference on
selected points” from the shortcut menu.