Apple Motion 5.1.1 - Manual (Page 1004)

Chapter 22 Motion tracking 1004
•
Transform: Use this pop-up menu to choose how the destination object moves. There are two
options:
•
Attach to Source: This option anchors the foreground object to the recorded track or
animation source. Use Attach to Source when the source object is scaling or rotating,
and you want the destination object to “stick” to a specific spot on the source object.
Any animation that existed on the destination object before applying the track can be
preserved by using the Adjust parameters (Position, Scale, and Rotation), available when
Transformation is chosen from the Type pop-up menu.
Note: Although the destination object is attached to the movement of the source object, the
destination object can be offset from the source object.
•
Mimic Source: This option allows the destination object to “mimic” the recorded track or
animation source. Any animation that existed on the foreground object before applying
the track can be added to the track by selecting Position, Rotation, or Scale in the
Adjust parameters.
Note: As with Attach to Source, the destination object can be offset from the source object.
•
Align Tangents: When this checkbox is deselected, tangents remain aligned at their original
angles. When the checkbox is selected, the tangents match the transformation of the source
animation, and the shape changes its form.
•
Movement: The Movement parameters contain the Analyze and Reverse controls, which appear
when there is a tracking source (footage) in the source well.
•
Analyze: Click the Analyze button to begin the motion-tracking analysis. When you click
Analyze, a status window appears and displays the tracking progress. To stop the analysis,
click the Stop button in the status window or press Esc. The start of the track is based on the
current playhead position, rather than the start of the behavior in the Timeline.
•
Reverse: When the Reverse checkbox is selected, the clip is analyzed from the current
playhead position to the first frame of the clip (or the first frame of the tracking behavior).
Note: You must move the playhead to the frame where you want to begin the reverse analysis.
•
Tracker Preview: This preview area appears only when there is a tracking source (footage) in
the source well. Use the preview to see a magnified view of the tracking reference area for the
selected tracker. The preview updates as you adjust the position of the tracker in the Canvas.
You can also drag in the preview area to adjust the position of the tracker. When dragging in
the preview area, the image moves around the red crosshairs in the preview and the tracker
moves in the Canvas.
•
Offset Track: This parameter appears only when there is a tracking source (footage) in the
source well. If a tracker’s reference point becomes temporarily hidden or goes off the screen,
this parameter lets you select a different reference point that continues the same tracking path
as the original reference point. For more information on offset tracking, see
Track obscured or
off-frame points on page 988.
•
Auto-Zoom: This parameter appears only when there is a tracking source (footage) in the
source well. Choose an option from this pop-up menu to set the magnification level when
positioning the tracker in the Canvas, to zoom in on the Canvas when searching for an ideal
tracking reference pattern. There are four choices: None, 2x, 4x, and 8x.
•
Auto-Zoom Mode: This parameter appears only when there is a tracking source (footage) in the
source well. Choose an option from this pop-up menu to set the display of the auto-zoomed
tracker in the Canvas. There are three choices:
•
Normal: Displays a normal pattern.
•
Contrast: Displays the tracker pattern with contrast detection.
67% resize factor