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Camera Tracker: Motion Trackers Rollout 673
increment selected. So, if you’re zoomed out
two times and the subpixel increment is 1/16
of a pixel, the nudge increment is four image
pixels, due to the zoom. However, if you’re
zoomed in five times, the nudge increment is
1/16 of an image pixel, due to the subpixel level.
• Bounds: You adjust the bounding boxes by
pressing and dragging the handles of t he box
youwanttoadjustintheselectedgizmo.
Dragging the handles of the inner feature
bounds box adjusts the opposite cor ner
symmetrically to keep the gizmo center fixed.
Typically when setting up tracker gizmos you
should create and position them all roughly in a
zoomed-outview,thenzoominononeofthem,
fine-tune its position and bounds, then tab to the
next gizmo and repeat.
Movie Window K ey board Shortcuts
You c an use the follow ing keyboard shortcuts in
the Movie window:
•
I , i : Zoomsinonaselectedgizmo.
•
O , o : Zooms out on a selected gizmo .
•
R , r : Resets zoom level to 100 percent.
•
Ta b : Selects next numbered gizmo, cycles
back to first gizmo after the last.
• [digit]: Selects the numbered g izmo, only
works for gizmos 1 to 10 (0=10).
• Ar row Keys: Nudges the gizmo in the direction
of the arrow.
Came ra Tracker: Motio n Trackers
Rollout
Utilities panel > Utilities rollout > More button > Utilities
dialog > Camera Tracker > M otion Trackers rollout
The C amera Tracker uti lity’s Motion Trackers
rollout sets up and controls the image feature
trackers. All the trackers created are listed here:
showing enable check mark, tracker number,
associated scene point object name, and active
frame r ange. To select a t racker, click i n the list.
Pro vides controls for subpixel tracking as well.
Interfa ce
On—Whenturnedon,thefeaturewillbetracked
in the image when the movie is stepped through
in the Movie Stepper, or when a full track is
performed. An X appears in the tracker list when
turned on.
Off—When tur ned off, the t racker will sit at the
closest known position prior to the current frame.
Because feature tracking is computationally
intensive,sometimesit’susefultodisablethe
trackers you’re not working on to speed up movie
stepping.
All—Enables all the trackers.
None—Disables all the trackers.
New Tra ck er—Creates a new movie feature tracker.
This places a feature tracker gizmo in the center of
the Movie window and a new entry in the tracker
list. The new tracker takes on the parameters
currently displayed under Tracker Setup. You
can change these parameters after you create the
tracker,butit’softenusefultosettheMaxMove
Per Frame parameter prior to creating the new