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Automatic Tracking
Open the shot.
On the Solver panel, set the camera’s solving mode to Disabled.
On the Shot menu, select Add Moving Object. You will see the object at the origin as a diamond-shaped null object, and the Active Tracker Host will change to Object01. (Names can be changed by double-clicking the name in the selection dropdown at top left of the user interface.)
Switch to the Roto Masking panel, with the camera viewport selected.
Use Mask ML to create a matte layer (or layers) that matches the object to be tracked, and optionally for any interfering garbage areas in front of it. You can also use splines to create a matte, for the object and/or for garbage areas. Any combination of the two that works will be good. You can close Mask ML once you have written your layers to disk.
In the layer list on the Roto panel, select Spline1 and change the dropdown underneath the layer list to Garbage.
Select the object layer (here it’s Truck) and change the object setting from Garbage to Object01. Your screen should look something like this:
Go to the Summary Panel.
Click Run Auto-tracker.
Examine your trackers, removing any that are unusable, eg that move independently or non-rigidly compared to the object being tracked.
Go to the Solver panel.
Hit Go!
You’ll need to set up a local coordinate system for the moving object, for example using *3. That will control the positioning of the moving object null vs the trackers on the moving object.
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