Avatar, virtual camera
We cannot imagine behind a production like this.
This video is part of a presentation that was held at Autodesk University
Is you are impatient, I suggest you go to the minute 2:20.
They comment about the VIRTUAL CAMERA.
A technology that allowed James Cameron to walk across the stage, grad the camera and see their actors, their characters, their world in REAL TIME !!!
This one shows, in a more colloquial language, how to film using the virtual camera.