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Best to just share your calibration and action videos with iPi Support, there are many causes that new users can quite easily overlook, or not be able to determine the cause, when many are easier to see by experienced users, or iPi Support, this is assuming your computer(s) used are compatible for the PS Eyes system use you are performing.
Once you get the PS cameras and PS controllers set correctly and detected properly, as well as correct room lighting and clothing, the system will track very accurately at 90% or better, even during fast motions and extreme motions, but there is always caveats during tracking when using RGB cameras, with any mocap system that may cause interference with the tracking, that just comes with usage experience and can usually be rectified with iPi by simply re-tracking the area, or some basic clean up in iPi Studio, or ultimately in post.
Be aware that PS Eye cams do not like really bright light and definitely not where it shines into their lenses, better to have more less wattage lighting around the area, this will also lessen the shadows on the floor. (Really bright room lighting can and most likely will cause frame drops randomly).
Good saturated clothing colors and tighter fitting is very important too, as well closely matching the iPi Actor dimensions to the video performer before tracking, using the Overall Body Mass set lower first, then individually adjusting the rest of the sliders will help, as well as the correct lengths of the Actor skeleton. (See the Pose Tab to set hip height accordingly, it usually comes in to high for most performers, which means you need to shorten the legs length and usually the arms length after to better match the performer).
If your Actor height isn't within approx 1-2 cm of the performers actual height, when you refit the Actor from the center point floor mark, something is off, as this should occur without much issue when done properly.
Depending on the amount of cameras you are using, though 6 should be a minimum for better results, the positioning can be just about anywhere above 3 ft, can be lower in some circumstances, but to learn they should be set higher than 3 to 4 ft off the floor and the correct measurement used for camera 1 when calibration asks for it, as calibration is the most important part of RGB tracking quality, then lighting, then clothing, then background colors, as iPi does a pretty good job of removing background inconsistencies.
You are on the right track by choosing PS Eyes, though a bit slower in tracking depending on your graphics card, but much more accurate, with less loss of tracking and lessened post clean up, that is once you get things working properly, and the system does work properly with 6 cams, or more, with proper computer running the system, but would be best to let iPi see your videos and give some better recommendations. One note many don't understand, the Scene light is there for a reason, and should be placed in the Studio scene to match the brightest light source, so setting your lights should conform to give a directional lighting appearance on the performer, this doesn't mean a one sided lighting source, it means higher wattage lighting on some lamps and this works better if set from the side of the front facing actor, this helps split the shadows on the iPi Actors skin and can aid in tracking quality, but the main thing is that the scene light should be placed and used, just not forgotten about, it will make subtle, noticeably better differences in your tracking quality.
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