Okay, so let's say that we want to start with a shot of someone coming up through a door in the floor. The camera is level and facing forward, fairly wide, then starts a slow dolly back. As we dolly back, we reveal a much larger space, in which there are many other people coming up through other doors in the floor.
But all we've got is a single 8'*4' piece of dummy floor to work with.
As far as production is concerned, it doesn't seem too difficult to shoot. Seems to me like all you'd really have to do is keep the same focal length through all the shots, keep the dolly speed consistent, and move the camera as needed (since the dummy floor will of course stay in place). Big green screen behind the dummy floor, with blue (or red) balls marking each corner of the dummy floor.
Green screening should be easy enough. Tracking should be easy enough. But what about the seams? Each piece of 8*4 dummy floor is going to be placed next to another one, in post. How do we make it look like it's the same floor?
But all we've got is a single 8'*4' piece of dummy floor to work with.
As far as production is concerned, it doesn't seem too difficult to shoot. Seems to me like all you'd really have to do is keep the same focal length through all the shots, keep the dolly speed consistent, and move the camera as needed (since the dummy floor will of course stay in place). Big green screen behind the dummy floor, with blue (or red) balls marking each corner of the dummy floor.
Green screening should be easy enough. Tracking should be easy enough. But what about the seams? Each piece of 8*4 dummy floor is going to be placed next to another one, in post. How do we make it look like it's the same floor?