I'm thinking I read somewhere once that the PITCHf/x or some other similar product was in fact two dimensional at the front edge of the plate. I can only assume the current technology can model the 3-D strike zone and track the path of the ball through the entire length (depth?) of the zone. At a minimum, you could get away with maybe 3-4 two dimensional cuts through the zone and get a pretty good 3-D representation without using any additional technology.