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Tracking While Tracking
You might want the 2D trackers in a hybrid setup to themselves be tracked at the same time that the GeoH tracker is working out where the whole rig goes. Ideally this can save you from having to carefully supervise the 2D trackers.
To do this, you need to set up your 2D trackers on one initial frame, locked appropriately to locations on the rigged mesh. The 2D trackers are unlocked and enabled, ready to track. Same for the GeoH rig. Now you hit play to start tracking, and the 2D trackers are tracked and then the GeoH rig is snapped into position. Then, a key is placed for each tracker at the final image location of its 3D lock point.
This final step is good and bad. It prevents a misbehaving tracker from wandering off-course, compared to the overall rig position. But for a match-type tracker, it also "burns in" any change in the image of the 2D tracker, resulting in drift over the course of many frames.
So this is a bit of a limited stupid pet trick, suitable for short shots or when spot- or symmetry trackers are used. Supervised tracking is always best. But we may try to refine this strategy a little bit in the future to minimize drift.
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