Apple Shake 4 - Manual (Page 586)

586 Chapter 21 Paint
Attaching a Tracker to a Paint Stroke
In Edit mode, a preexisting track can be attached to a paint stroke.
To attach a track to a paint stroke:
1 Make sure the paint stroke is a persistent stroke.
Note: For information on converting a paint stroke from Frame to Persist mode, see
“
Converting Paint Stroke Types ” on page 589. You can also convert the stroke after the
track is attached.
2 In the Viewer, right-click the selected stroke, then choose an available track from the
“Add tracker to stroke” shortcut menu.
Note: Although only a single control point appears on the paint stroke when attached
to the track, the track is applied to the entire paint stroke. You cannot apply a track to
individual control points on a paint stroke.
The selected track information is then fed into the stroke’s panX and panY parameters
as an offset.
Once a tracker is attached to a paint stroke, the track information is displayed in the
Viewer on the paint stroke, as well as in the Edit Controls tab, next to the Convert
Stroke button. The track information is only displayed if that stroke is selected in the
strokeIndex or in the Viewer.
To remove the track, right-click the paint stroke in the Viewer, then choose “Remove
tracker reference” from the shortcut menu.
Once the paint stroke is attached to the track and you have achieved the result you
want, you can “bake” the tracker information into the stroke.
To bake the track:
1 Make surethat Edit mode is on.
2 Select the stroke (click the stroke in the Viewer or select the stroke in the strokeIndex
slider in the Edit Controls tab).
3 Right-click the paint stroke, then choose “Bake tracker into paint stroke” from the
shortcut menu.
The keyframes are applied to the paint stroke, and the track information no longer
appears in the Edit Controls subtab.