Apple Motion 5.1.1 - Manual (Page 985)

Chapter 22 Motion tracking 985
1 In the Keyframe Editor, click in the fifth column of the parameter to open the Animation menu,
then choose Reduce Keyframes.
The Reduce Keyframes dialog appears.
Reduce Keyframes applies a thinning algorithm to the keyframes for the parameter. This reduces
the number of keyframes while attempting to maintain a similar shape to the curve. The thinning
algorithm can be adjusted in two ways. Increasing the Error Tolerance results in fewer keyframes.
Increasing the Smoothing (frames) makes smoother curves between keyframe values.
This example uses 5, which means that 5 track points centered on the evaluated point are used
to compute the current point’s new, smoothed value. This is a standard Gaussian (bell-curve
type) filter. In other words, if you leave the Smoothing value at 5, when the value of frame 12 is
computed, frames 10, 11, 12, 13, and 14 are considered. If Smoothing is set to 3, the algorithm uses
frames 11, 12, and 13. The larger the Smoothing value, the more points are considered (and thus
more calculations done) for every point in the curve.
2 Set the values in the Reduce Keyframes dialog.
As you adjust the sliders or value sliders in the dialog, the curve is modified in the Keyframe
Editor. There are now fewer keyframes on the curve, and the curve becomes smoother.
3 Click OK.
Apply an Average parameter behavior to a track curve
Another smoothing option is to apply the Average parameter behavior to a track curve in the
Keyframe Editor. This behavior smoothes the transition from one keyframe value to another.
Averaged motion moves more fluidly.
m In the parameter list of the Keyframe Editor, control-click the parameter name, then choose
Average from the shortcut menu.
The track is averaged, indicated by the simplified curve that appears behind the keyframes in the
Keyframe Editor.
For more information on using the Average parameter behavior, see
Average on page 333.
Convert tracks to keyframes
Tracking data recorded or referenced by the Match Move, Stabilize, or Unstabilize behavior can
be “baked” into keyframes on the transformed object. The tracking keyframes are applied to the
tracked object and the behavior is deleted. You can then modify the animation curves in the
Keyframe Editor.
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