3
Table Of Contents
- Motion 3 Supplemental Documentation
- Contents
- 3D Compositing
- Motion Tracking
- About Motion Tracking
- How a Tracker Works
- Motion Tracking Behaviors
- Shape Track Points Behavior
- Track Parameter Behavior
- Motion Tracking Workflows
- Adjusting the Onscreen Trackers
- Strategies for Better Tracking
- Finding a Good Reference Pattern
- Manually Coaxing Your Track
- Manually Modifying Tracks
- Converting Tracks to Keyframes
- When Good Tracks Go Bad
- Smoothing Tracking Keyframe Curves
- Preserving Image Quality
- Asking Motion for a Hint
- Giving Motion a Hint
- Tracking Images with Perspective, Scale, or Rotational Shifts
- Tracking Obscured or Off-Frame Points
- Tracking Retimed Footage
- Troubleshooting Stabilizing Effects
- Removing Black Borders Introduced by Stabilizing
- Some General Guidelines
- Tracking and Groups
- Saving Tracks
- Motion Tracking Behavior Parameters
112 Chapter 2 Motion Tracking
Note: You must move the playhead to the frame from which you want to begin the
reverse analysis.
For a description of the Tracker Preview, Offset Track, Auto-Zoom, Auto-Zoom Mode,
Look Ahead Frames, and track list parameters, as well as the tracker subparameters, see
“Tracker Controls” on page 112.
For information on using the Track Parameter behavior, see “Track Parameter Workflow”
on page 79.
Tracker Controls
All onscreen trackers, regardless of the Motion Tracking behavior, have the following
parameters in common:
Tracker Preview: This preview area provides a magnified view of the tracking reference
point for the selected tracker. The preview updates as you adjust the position of the
tracker in the Canvas. You can also drag in the preview area to adjust the position of
the tracker. When dragging in the preview area, the image moves around the red
crosshairs in the preview and the tracker moves in the Canvas.
Offset Track: If a tracker’s reference point becomes temporarily hidden or goes off the
screen, this parameter allows you to select a different reference point that continues
the same tracking path as the original reference point. For more information on offset
tracking, see “Tracking Obscured or Off-Frame Points” on page 91.
Auto-Zoom: Choose an option from this pop-up menu to set the magnification level
when positioning the tracker in the Canvas. This allows you to zoom in on the Canvas
when searching for an ideal tracking reference pattern. There are four choices:
 None: When moving the tracker in the Canvas, there is no magnification (only the
tracker appears).
 2x: When moving the tracker in the Canvas, the magnification around the tracker is
two times the normal zoom level.
 4x: When moving the tracker in the Canvas, the magnification around the tracker is
four times the normal zoom level.
 8x: When moving the tracker in the Canvas, the magnification around the tracker is
eight times the normal zoom level.
Auto-Zoom Mode: Choose an option from this pop-up menu to set the display of the
auto-zoomed tracker in the Canvas. There are three choices:
 Normal: Displays a normal pattern.
 Contrast: Displays the tracker pattern with contrast detection.
 Edge: Displays the tracker pattern with edge detection.