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Planar Tracker Layering
Planar trackers occlude one another: if a planar tracker moves in front of another planar tracker, the tracker in back will have a dynamic hole knocked in it by the foreground tracker.
For example, consider a planar tracker tracking a car as both pass in front of a wall that is being tracked by a second planar tracker. The tracking of the background wall will not be affected by the pixels corresponding to the foreground planar tracker.
Note that to make this useful, the in-plane masks on the foreground planar tracker are used to occlude the background. If the foreground planar tracker is circular, for example, it will knock a circular hole in the background planar tracker, as you'd expect.
Warning! If you change a foreground planar tracker, you will probably want to manually re-run the track of the background planar tracker as different pixels will be exposed or covered; this must be done manually because it generally involves a substantial CPU load, and you don't want to do it until you're really done with the foreground tracker.
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