i have my first session for 180 degree. these are notes;

1.you need much more space. it is very hard for me to make it at my home. i requires minimum 5 meters. if you don't live in a castle it is hard to find this space :-)
2. 2 kinects recording requires good disk like ssd. i often get io buffer up error.
3. for good calibration you must firmly fix kinects. after calibration video if you move one of them for few milimeters accidentaly, you must record your calibration video again.
4.for big space requirement you need additional usb cables.

i consider to use 4 cameras. can i use 4 cameras at 5.5 m x 5 m room?

4 kinects is overkill, dont persue this option, waste of time.

Four PS3 Eye cameras is a good system but it will require more room than dual Kinect. This system is generally better if you need more room to perform in and have the space available. It is also more complicated to set up than Kinect.

If space is limited, you should not bother with a 180 setup for dual Kinect Sensors. Even set between 60 to 90 degrees, the dual Kinect setup can resolve many occlusion issues. For example, in the 'chainsaw dance' sequence of my short film 'Happy Box', the character makes a 360 degree turn (several times in the original captured data,) and iPi Studio tracked this motion perfectly. The Kinect Sensors for this session were set to less than 60 degrees apart. (I can check my calibration scene for actual measurement if you're interested, but FWIW, if you look at the demo video on my YouTube test channel it looks like it's barely 45 degrees.)

Hope this helps.

G.

_________________
Greenlaw
Artist/Partner - Little Green Dog | My Demo Reels (2013,) (2015,) (2017,) and (2019)

Watch a one minute excerpt on Vimeo now!

A good example is this recent video posted by iPi showing full rotation captured with reasonable accuracy. If you look at the camera positions, they are set at about 90 degrees, not 180.

http://www.youtube.com/watch?v=msRtIZX5 ... ideo_title

That said, I was able to capture similar actions with an even smaller angle (my living room is fairly small.) I would imagine you could do the same.

Hope this helps.

G.

_________________
Greenlaw
Artist/Partner - Little Green Dog | My Demo Reels (2013,) (2015,) (2017,) and (2019)

Watch a one minute excerpt on Vimeo now!

We had a similar setup for a room, 5.8 m x 4.8 m, however it is actually shaped like the letter L, and I've just recently thought that it might have actually been the problem that confused especially the calibration. Now I would buy some cheap sheets and cover temporarily everything that might be a problem (reflective surfaces, open doorways, tables full of stuff, paintings, areas with strong contrast).

Knowing what I know now, I would fix the PS3 cameras tightly to the ceiling so that they cannot move no matter what. Fixed to tripods, they are likely to be bumped into and if they have moved during the takes it will be a hassle. All the cameras far away and high above the ground might create new problems, though:
- is the tracking still accurate enough?
- they "see" a lot of unnecessary space (not easy to hide yourself, might have to cover a lot of stuff with sheets)
- being so near the light source might be a problem
- wires (always some kind of a problem with these) have to be fixed somehow, too

The lights have to considered as well. It might be, that every camera "sees" the actor in different shades of grey under fluorescent lights. No matter what colors he/she is wearing. I haven't any solutions to this particular problem. Anybody got a cheap portable sun?