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Great!
I have read where 16 cameras can be a bit of a task to calibrate easily and consistently, although I have never attempted it yet.
One thing you should do is don't turn off the standard room lighting, just use the camera darkening options, but it is better to turn off any extra lights, or glowing objects that would be in the trajectory of your light cage, as stated above by Greenlaw, or the iPi tracker may jump and lock on to those and ruin your calibration attempt, and you won't know this until you actually run the calibration in the Studio.
Also, it is better to have the lowest number of misdetects possible, this number optimally would be below 1% and very close to same number on all cameras, even though iPi Docs states it can be up to 10%, I find that to be too high of an error rate for best results in tracking, as it causes cameras with higher error rates to not align as well as they should on refit, just my personal opinion over the many times I have calibrated my 6 camera set up and tried tracking with many different calibration video results.
Now I know exactly what my calibration readings should be and if they are off, I know something didn't go as well as possible and I re-do the light tracking video again.
Always best to do a second calibration phase after any full session also, that way you have a second choice just in case a camera got inadvertently moved, even slightly.
You must be using a fairly large area to be using 16 cameras, or are you using a several high, several level and several low set up on a smaller capture volume? Just wondering.
I would like to ask if you would post a YouTube video link in this thread of your tracking results once you get things working well?
Good Luck!
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