Hi Nick,
Most likely your version of the PPT software is only configured for head-hand tracking which requires a certain vertical separation for the markers for all four cameras. Depending on how the cameras are mounted and potentially tilted, the horizontal up/down split does not work when the markers are moved apart in the room.
The newer versions of the PPT do not have this restriction and can track up to four points.
Can you let me know which version of PPT you are running? The version is indicated in the lower right corner of the PPT interface.
Thanks,
Matthias
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