There's been an explosion of interest in 3D recently with 3D CGI hitting the big screen (e.g. Toy Story, Monsters Inc, Up, MegaMind etc), computer games, the use of stereo cameras for broadcasting sport and live events, stereo goggles in cinemas and the introduction of 3D TV sets. 3D stands for three-dimensional or the third dimension and in media terms its desireable because the real world is three dimensional and anything that approaches this level of realism can't be a bad thing because we get to use more of visual system which evolution has spent millions of years perfecting. This article will give you a basic understanding of how 3D vision works.