User Manual

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The Best Match mode would detect that the change from the previous frame’s pattern was too
extreme and would not grab a new pattern from that frame.
The Adaptive mode is applied to all active patterns while tracking. If you only want some
patterns to use the Adaptive mode, disable all other patterns in the list before tracking.
Dealing with Obscured Patterns
Often, an otherwise ideal pattern can be temporarily obscured (occluded) or blocked from
trackingfor example, when tracking a car that passes behind a telephone pole.
In these situations, you divide the render range up into two ranges, the range before the
pattern is obscured and the range after the pattern becomes visible again. After tracking the
two ranges individually, the Tracker will automatically interpolate between the end of the first
range and the start of the second.
If you need to edit the resulting motion path to account for any non-linear motion that takes
place between the two tracked ranges, you can select the track path to expose a Node toolbar
with controls for adjusting the control points on this path. For example, you can choose Insert
and Modify mode to insert points in the non-tracked range to compensate for any nonlinear
motion in the tracked pattern.
Tools for modifying tracker paths in the Node toolbar of the viewer.
Dealing with Patterns That Leave the Frame
There are two options when a tracker leaves the frame. If the pattern re-enters the frame, you
can treat it like an obscured pattern. If the pattern does not re-enter the frame, or it is
undesirable to hand track portions of the movement, you can use the Track Center (Append)
mode to select a new pattern.
The Track Center (Append) mode pop-up menu.
The Track Center (Append) mode selects a new pattern that will continue to add keyframes to
the existing path. The offset between the old pattern and the new pattern is automatically
calculated to create one continuous path.
Chapter – 73 Using the Tracker Node 1501