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Room length is more preferred for PS Eyes, width not much of a concern, but to get a decent movement area, you will need a longer room, really about the same if you ever used Kinects in a 180 set up, so 20 ft (7 m) room length works well for a 10 x 10 ft (3 m x 3 m) capture volume, the shorter the room length lessens the front/back movement, which is more important, in my opinion.
To me personally, a square 4 cam set up isn't optimal, but I agree 4 cams should be the minimum cams used, although if you can fit 6 in your area, even better at not much added cost, unless you need a higher end graphics card to drive the tracking at faster speeds for 6 cams and it is always better to have 1 camera set much higher for better foot tracking, so even 5 cams would help.
Until you know the dimensions of the new room, it's hard to say how you can set up, everything really depends on knowing that first of all, BUT...
If you have enough room length and at least 10 ft (3 m) wide, you would be better off with a semi-circle on the front 3 cams, and one straight facing rear cam, as most actions take place in a forward facing fashion, but of course not always, so the rear cam will allow for better rear facing actions when needed.
Though if limited in room length, it would be better to not use a 4 corner placement and use a placement where you would perform nearer to a rear wall, or even using a catty corner placement in the room, with 2 cams set approx. 3 ft (1 m) off the rear/corner, (if catty corner wall), and up higher if room width is shorter, and 2 cams in front corners, or appropriate if using catty corner set up, still keeping the front cams spacing at 8 ft (2.5 m) from floor marking, this will allow you to perform off the wall to clear arms extensions on rotations when needed.
Remember you need to keep a space of min. 8 ft (2.5 m) from the edge of the floor capture volume floor mark to the camera for better view, marking floor area with a few short pieces of masking tape will help greatly and using a 3D object like a soda can, or block of wood set at exact center on the floor to get proper camera centering will help also.
If you have not used PS Eyes before in a proper room set up, there is a learning curve and there is a bit more to the set up than with Kinect sensors to get better results.
I have my cams permanently fixed to walls, and I just made some 1.5 wide x 4 in long thin aluminum and bent to an L shape, then used the 3M strips with the velcro middles (2 per cam) to hold them to the wall and used medium binder clips to hold the cam to the bracket, works perfect for very little expense, and no damage to wall when installed, or removed. (Just 1 way of many you could use to attach to a wall).
You only need USB 2.0 repeater cables, but long enough to be able to route them out of the capture volume area, 10 m (30 ft) works fine, even if camera isn't a long way from computer and you have the length already there if needed later. (Don't buy cheap cables, you will regret it!)
These are just some of my personal opinions, many ways to make it work, but you will personally need to do your own trial and error placements to best fit your area anyway, though I hope it helps.
Feel free to re-post once you get new room, with the components needed and working, I would like to see what you came up with as your set up.
Good Luck!
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