Instruction Manual

Chapter 22 Motion tracking 1007
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Transform: This pop-up menu sets how the selected position parameter moves. There are two
options:
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Attach to Source: This option anchors the position of the object to the recorded track or
animation source. Use Attach to Source when the source object is scaling or rotating, and
you want the lter’s center to stick to a specic spot on the source object. Any animation
that existed on the lter’s center 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 object’s position is attached to the movement of the source object, its
position can be oset from the source object.
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Mimic Source: This option allows the 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 object’s position can be oset from the source object.
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Movement: Click the Analyze button to begin the motion-tracking analysis. A status window
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.
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Reverse: Click the Reverse checkbox to analyze the clip in reverse, from the current playhead
position to the rst frame of the clip (or the rst frame of the tracking behavior).
Note: You must move the playhead to the frame where you want to begin the reverse analysis.
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Tracker Preview: Use this preview area to see a magnied 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.
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Oset Track: If a tracker’s reference point becomes temporarily hidden or goes o the screen,
use this parameter to select a dierent reference point that continues the same tracking path
as the original reference point. For more information on oset tracking, see Track obscured or
o-frame points on page 988.
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Auto-Zoom: Choose an option from this pop-up menu to set the magnication 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.
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Auto-Zoom Mode: Choose an option from this pop-up menu to set the display of the auto-
zoomed tracker in the Canvas. There are three choices:
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Normal: Displays a normal pattern.
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Contrast: Displays the tracker pattern with contrast detection.
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Edge: Displays the tracker pattern with edge detection.
The Auto-Zoom Mode applies to trackers in the Canvas and does not appear in the Tracker
Preview in the Behaviors Inspector.
Note: When None is chosen from the Auto-Zoom pop-up menu, the Auto-Zoom Mode setting
has no eect.
67% resize factor