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Supervised Tracking
The shot is best tracked backwards: the trackers can start from the easiest spots, and get tracked as long as possible into the more difficult portion at the beginning of the shot. Tracking backwards is suggested for features that are coming towards the camera, for example, shots from a vehicle.
- Open the lazysue.avi shot, using the default settings.
- On the Solver panel, set the camera’s solving mode to Disabled.
- On the shots menu, select Add Moving Object. You will see the object at the origin as a diamond-shaped null object.
- On the Tracker panel, turn on
Create 
. The trackers will be associated with the moving object, not the camera.
- Switch to the Camera viewport, to bring the image full frame.
- Click the
To End 
button on the play bar.
- Click the Playback direction button from
to 
(backwards).
- Create a tracker on one of the dots on the shelf. Decrease the tracker size to approximately 0.015, and increase the horizontal search size to 0.03.
- Create a tracker on each spot on the shelf. Track each as far as possible back to the beginning of the shot. Use the tracker mini-view to scroll through the frames and reposition as needed. As the spots go into the shadow, you can continue to track them, using the tracker gain spinner. When a tracker becomes untrackable, turn off Enable
, and Lock the tracker 
. Right-click the spinner to reset it for the next tracker.
- Continue adding trackers from the end of the shot roughly as follows:
- Begin tracking from the beginning, by rewinding, changing the playback direction to forward
, then adding additional trackers. You will need to add these additional trackers to achieve coverage early in the shot, when the primary region of interest is still blocked by the large storage container.
- Switch to the graph editor in graph mode
, sort by error mode 
. Use the mouse to sweep through and select the different trackers. Or, select Sort by error on the main View menu, and use the up and down arrows on the keyboard to sequence through the trackers. Look for spikes in the tracker velocity curves (solid red and green). Switch back to the camera view as needed for remedial work.
- Switch to the Coordinate System control panel and camera viewport, at the end of the shot.
- Select the tracker at center back on the surface of the shelf; change it to an Origin
lock.
- Select the tracker a bottom left on the shelf, change it to Lock Point with coordinate X=10.
- Select the tracker at front right; change it to an On XY Plane lock (or On XZ if you use Y-axis up for Maya or Lightwave).
- Switch to the Solver control Panel.
- Switch to the Quad view; zoom back out on the Camera viewport.
- Hit Go! After solving completes in a few seconds, hit OK.
- Continue to the After Tracking section, below.
©2024 Boris FX, Inc. — UNOFFICIAL — Converted from original PDF.