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ZWTs don’t have to be only on a camera, they can be attached to a moving object as well. You can also configure Far ZWTs. Offset ZWT trackers can not take advantage of search from solved mode.
The ZWT calculation respects the coordinate system constraints: you can constrain Z=0 (with On XY Plane) to force a ZWT onto the floor in Z-up mode. A ZWT can be partially linked to another tracker on the same camera or object. It doesn’t make sense to link to a tracker on a different object, since such links are always in all 3 axes, overriding the ZWT calculation. Distance constraints are ignored by ZWT processing. (Again, ZWTs do not affect the solution and any constraints on them will not affect the coordinate system.)
If you have a long shot and a lot of ZWTs and must recalculate them often (say by interactively editing the camera path), it is conceivable that the ZWT recalculation might bog down the interactive update rate. You can temporarily disable ZWT recalculation by turning off the Track/ZWT auto-calculation menu item. They will all be recalculated when you turn it back on.
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