8

654 Chapter 12: Animation
Inter face
Movie Frame Counter—Advances the Movie
window to the designated frame.
V CR controls—Navigates through the movie in the
Movie window:
<<—Steps to the start frame of the selected tracker.
<10—Steps back 10 frames.
<—Steps back one frame or keyframe if Step
Keyframesisturnedon.
>—Steps f orward one frame or keyframe if Step
Keyframesisturnedon.
>10—Steps forward 10 frames, either directly or
one frame at a time if the Master Track Enable
check box is turned on.
>>—Stepsforwardtotheendframeoftheselected
tracker, either directly or one frame at a time if the
Master Track Enable check box is turned on.
Feature T rackin g—If turned on, any forward steps
w i ll cause frame-by-frame feature tracking to be
performed for all enabled trackers with unknown
position data at the f rames you previously stepped
through. You can use this to perform a tracking
checkwhiletestingboundssettingsortoreview
tracked positions one frame at a time. The tracker
also moves the gizmos to previously tracked
positions, so you can rev iew tracking results
a few frames at a time. If you want, you can
force a retrack by nudging a keyframe gizmo
back-and-for th which causes the gizmos to drop
all subsequent tracked positions up to the next
keyframe.
Note: Make sure this button is turned off if you just
want to step through the movie without tracking,
such as when browsing through the movie to
find and place Start and Stop frames for trackers
that come on screen or go off screen during the
tracking range.
Cle ar Trackin g to En d —Removes all tracked
positionsandkeyframesfromthecurrentstepper
frame onward for the current ly selected tr acker.
This is often helpful if you have too many errors
and error correcting keyframes at the end of a
track and you want to clear them and tr ack to the
end again.
Step K eyframes—Modifies the operations of the
single-step buttons in the Movie Stepper. If turned
on, the single step buttons step immediately to
the next or previous keyframes, allowing you
to browse through them quickly. In this mode,
feature tracking is disabled.
Show Tr ack —Displays a visible tracking line in
the Movie window for the currently selected
tracker. This button shows where the tracker
has cu rrently tr acked. A red line is displayed for
tracked seg ments, a white dashed line for segments
stilltobetracked. Whitedotsarecenteredon
each frame position with a green box around each
frame position at which you or the tracker create
keyframes.
Live Camera Match—Enabled after you set up the
match parameters and select a match camera in
the Match rollout. If turned on, the match camera
positionisrecomputedandadjustedasyoumove
gizmos in the Movie window. This can be useful
for making corrections to bad match frames by
adjusting the trackers or to check the effect of