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Depending on your available space for set up, and guessing you are referring to use of PS Eyes, a good consideration for a set up is how Organic Motions Open Stage set up is configured.
You can visualize it here:
https://www.youtube.com/watch?v=PpvYR9yA0JkYou will notice how the performer isn't fully illuminated and same method applies for iPi Recording, using enough light for the PS Eyes to see the colors worn by the performer(s).
You could of course use blue or green back drops, but white works just as well and reflects white light more diffusely, green, or blue will reflect green and blue bleed on to a performer and white usually won't conflict with any colors worn by the performers, not even the arm/face skin color and most likely easier and cheaper to find and use solid white sheets, or drop cloths.
Non-shiny flooring is agreed with, especially for calibration, but you don't need to use the green interlocking pads shown in the video either, a lighter colored flooring or carpeting works fine, although those locking padded tiles come in many lighter colors and reasonably priced on eBay to cover a 10 ft x 10 ft area, or larger if wanted.
Here is a single camera view from a while ago of the space I use:
http://youtu.be/4Zt4nnDaXDgI still use the same space, but now I don't use the lights during the day recordings and tweaked my Gain setting a bit lower for all cams to 16 and the Exposure to 60 and turn off Auto-gain, it removes the white film over the recording as seen in that video and puts more contrast on to the performer for better color saturation and I don't use arm cover shirt any longer either and much tighter T shirt used now also and I get very good tracking results with high energy dance motions in almost any positions they can perform.
I also sit right in the same room with the computer and performer while recording, I just wear clothing to blend in to the background more, sitting still while recording is going on, and have never had iPi tracking jump off on to me and not the performer and I am not in the scene during the background evaluation either.
This is my set up with 6 PS Eyes, it works well for me, but maybe not for all users, since most don't use a 3 sided windowed room, why I referred to more of a set up like used in the Organic Motion video.
Camera calibration and the iPi Actor skeletal set up is also very important for better tracking, so be sure those are very accurate and you should get pretty good tracking results, I also suggest at least using the Flex spine option, the stiff spine will affect the tracking on most human motion results, and with high energy motions like dancing or fighting, you can use the very flex spine option, as long as the motion is in constant motion, but you can switch between flex and very flex within the same take, but there is more steps involved to make it work optimally when the Refining stage is run.
Good Luck
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