on Sep 11, 2014 at 4:03:53 pm Last Edited By Thomas Leong on Sep 11, 2014 at 4:09:03 pm
"(For example, someone talking and walking on the Left projector, and then 'walking' to the Main, and then to the right projector)"
Complicated. Are you shooting with one camera or 3 cameras?
With one camera, next question is what is the native resolution of your projectors? If they are HD, you'll probably need at least a 4K camera (Red?) to maintain some sort of resolution.
With 3 cameras, they will have to be aligned similar to the projection as well. If side-by-side projection with no overlap, each camera's field of view edge would have to meet the adjacent camera's field of view edge.
With a one camera shoot at min. 4K, next step is to take the footage into, say, After Effects, and output 3 files aligned to the alignment you intend to project - either side-by-side, or with overlapping areas, taking into account the amount of the overlap in pixels.
Then you need a playback software that can synchronize playback of the 3 files, and have a machine or multiple machines that can handle the 3 files at those resolutions. The more pixels the more demanding from the machine(s) playing back without hiccups. Some options here are -
Apple: RenewedVision Playback Pro2
Windows: Dataton Watchout; AvStumpfl Wings Platinum