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An Overall Strategy
Although we have talked as if SynthEyes only combines two trackers, in fact SynthEyes considers all the trackers simultaneously, and can merge three or more trackers together into a single result in one pass.
It is possible that coalescing immediately a second time may produce additional results, but this is probably sufficiently rare to make it unnecessary in routine use.
However, after you coalesce trackers, it will often be helpful to do a Refine solving cycle, then coalesce again. After the first coalesce, the refine cycle will have an improved geometric accuracy due to the longer tracker lifetimes. With the improved geometry, additional trackers may now be stable enough to be determined to be tracking the same feature, permitting a coalesce operation to combine them together, and the cycle to repeat.
Viewing this pattern in reverse, observe that a broader distance specification will be required initially, when trackers on the same feature may be calculated at different 3- D positions.
This is particularly relevant to green-screen shots, where the comparatively small number of trackable features and their frequently short lifetime, due to occlusion by the actors, can result in higher-than-usual initial geometric inaccuracy.
Because the green-screen tracking marks are generally widely separated, there is little harm in increasing the allowable coalesce Distance. The features can then be coalesced properly, and the Refine cycle will then rectify the geometry. The process can be repeated as necessary.
If you are using Add Many Trackers and then Coalescing and refining, you should turn on the Regular, not ZWT checkbox on the Add Many dialog, so that the added trackers will affect the Refine solution.
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