User Manual

Steady Angle
The Steady Angle mode can be used to stabilize footage in both X and/or Y to remove camera
shake and other unwanted movement. When you connect a control, for example the Angle of a
Transform, to the Steady Angle of the Tracker, it will be placed at 0 degrees by default at frame
1. This can be changed by means of the Reference mode in the Tracker’s Operation tab. From
there on, the resulting motion of the Steady Angle mode will rotate into the opposite direction
of the original motion.
So if the angle at frame 10 is 15 degrees, the result of the Steady Angle will be -15 degrees.
To use Steady Angle, you need at least two tracked patterns in your tracker. With just one point,
you can only apply (Un)Steady Position.
Offset Position
An Offset Position is essentially the path generated by the tracker. It is the one you select when
you want an object to follow the path. It is available for each single tracker in the Tracker node
and refers to that single tracker only. When you connect the Center X and Y parameters to the
offset position of the Tracker, the node’s center will follow exactly the path of that tracker.
Connecting to single trackers is always useful when you want to match elements with object
motion in your footage. For example, you could track a hand of your actor and attach a ball to
the Tracker‘s offset position, so that the ball follows the exact motion of the hand. Or you could
track an element that needs rotoscoping and attach the mask’s center to the Tracker’s
offset position.
Unsteady Position
After using the Steady Position, the Unsteady Position is used to reintroduce the original
movement on an image after an effect or new layer has been added. The resulting motion from
Unsteady Position is basically an offset in the same direction as the original motion.
Steady Size
The Steady Size connection outputs the inverse of the tracked pattern’s scale. When you
connect a parameter, for example the Size of a Transform, to the Steady Size of the Tracker, it
will be placed with a Size of 1 (i.e., the original size) by default at frame 1. This can be changed by
means of the Reference mode in the Tracker’s Operation tab. The resulting size of the Steady
Size mode will then counteract the size changes of the original motion. So if the actual size at
frame 10 is 1.15, the result of the Steady Size will be 1 - (1.15 - 1) = 0.85.
To use Steady Size, you need at least two tracked patterns in your tracker. With just one point,
you can only apply (Un)Steady Position.
Using the Outputs of a Tracker
The tracker outputs described above are published by each tracker pattern created in the
Tracker node. Each Tracker node itself also publishes a Steady Position, Angle, Size and an
Unsteady Position. The values of these Tracker node outputs are calculated using all the
patterns in that tracker, as configured by the Match Move Settings controls in the Tracker’s
Operation tab.
Chapter – 73 Using the Tracker Node 1507