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
Chapter 2 Motion Tracking 63
Four-Corner Pinning with Match Move
The Match Move behavior allows you to track four points on a background clip and
apply the motion to the four corners of a foreground element. There are two possible
four-corner pinning workflows. In the first example, a foreground element is pinned to
a background element using the four-corner trackers. In the second example, the
foreground element is corner-pinned prior to using the four-corner trackers.
Note: You can also perform four-point tracking using the Analyze Motion or the
Stabilize behavior. For more information, see “Using a Non-Match Move Four-Point
Track for Corner-Pinning” on page 71.
There are special considerations when corner-pinning groups. For more information,
see “Tracking and Groups” on page 97.
Option 1: Pinned Image Is Locked to the Reference Points
This workflow is ideal for a four-corner pin in which the transformed or “pinned” image
is the same size as the background “frame” (or reference patterns) to which it is being
tracked. In the following example, a foreground image is pinned to a background clip
of a picture frame.
To track an image using four trackers:
1 Drag the playhead to the frame where you want to start the track and apply a Match
Move behavior to the foreground element.
About Destination Object Animation
You can instantly apply the animation of an object (called the source object) to
another object (called the destination object) using the Match Move behavior. The
source object can be animated by behaviors or keyframes. The destination object can
also be animated.
You can specify whether the animation of the destination object is ignored by the
match move or added to the match move. You do this by choosing an option from
the Transform pop-up menu in the Behaviors tab of the destination object.
When you choose Attach to Source from the Transform pop-up menu, any animation
in the destination object is ignored, and the object is locked to the animation of the
source object. When you choose Mimic Source, any animation in the destination
object is added to the source object’s animation (starting at frame 0). For more
information on Attach to Source and Mimic Source, see “Match Move Controls” on
page 100.