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You might discover that you have two or more trackers tracking the same feature in different parts of the shot, or that are extremely close together, that you would like to consolidate into a single tracker.
Select both trackers, using a lasso-select or by shift-selecting them in the camera view or graph editor (see the Lasso controls on the Edit menu for rectangular lassos).
Then select the Track/Combine trackers menu item, or the Shift-7 (ampersand &). All selected trackers will be combined, preserving associated constraint information.
If several of the trackers being combined are valid on the same frame, their 2-D positions are averaged. Any data flagged as suspect is ignored, unless it is the only data available. Similarly, the solved 3-D positions are averaged. There is a small amount of intelligence to maintain the name and configuration of the most-developed tracker.
When you combine trackers that have offsets, the offset channel data is lost: it is baked into the combined tracker position.
Note: the camera view’s lasso-select will select only trackers enabled on the current frame, not the 3-D point of a tracker that is disabled on the present frame. This is by design for the usual case when editing trackers. Control-lasso to lasso both the 2- D trackers and the 3-D points, or shift-click to select 3-D points.
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