User Manual

 Track Forward From Current Time: Clicking this button causes all active trackers to
begin tracking, starting at the current frame and moving forward through time until the
end of the render range.
 Track Forward: Clicking this button causes all active trackers to begin tracking, starting
at the first frame in the render range and moving forward through time until the end of
the render range.
Tracking Behavior Controls
The following controls all affect how trackers adapt to changing patterns, how the resulting
track path is defined, and how many keyframes are generated.
Frames Per Path Point
This slider determines how often the Tracker sets a keyframe on the path. The default is 1,
which sets a keyframe on the tracked path at every frame.
Increasing the value causes the tracked path to be less accurate. This may be desirable if the
track is returning fluctuating results, but under normal circumstances, leave this control at its
default value.
TIP: If the project is field rendered, a value of 1 sets a keyframe on every field. Since
the Tracker is extremely accurate, this will result in a slight up-and-down jittering due
to the position of the fields. For better results when tracking interlaced footage in
Field mode, set the Frames Per Path Point slider to a value of 2, which results in one
keyframe per frame of your footage.
Adaptive Mode
Fusion is capable of reacquiring the tracked pattern, as needed, to help with complex tracks.
This menu determines the Adaptive tracking method.
 None: When set to None, the tracker searches for the original pattern in each frame.
 Every Frame: When set to Every Frame, the tracker reacquires the pattern every frame.
This helps the Tracker compensate for gradual changes in profile and lighting over time.
 Best Match: When set to Best Match, the tracker compares the original selected
pattern to the pattern acquired at each frame. If the variation between the two patterns
exceeds the threshold amount defined by the Match Tolerance control, the tracker
does not reacquire the pattern on that frame. This helps to avoid Tracker drift caused
by transient artifacts that cross the pattern’s path (such as a shadow).
Path Center
This menu determines how the Tracker behaves when repositioning a pattern. This menu is
particularly useful when a pattern leaves the frame or changes so significantly that it can no
longer be tracked.
 Pattern Center: When Pattern Center is selected in the menu, the tracked path
continues from the center of the new path. This is appropriate when replacing an
existing path entirely.
 Track Center (append): When Track Center (append) is selected in the menu, the path
tracked by a new pattern will be appended to the existing path. The path created is
automatically offset by the required amount. This setting is used to set a new tracking
pattern when the original pattern moves out of the frame or gets obscured by other
objects. This technique work bests if the new pattern is located close to the position of
the original pattern to avoid any problems with parallax or lens distortion.
Chapter – 107 Tracker Nodes 2394