By doing despicable things to your video data, the results can be wonderful
Good CGI is so realistic that you don't always know when you're looking at it. So, Ironically, CGI artists take it as a compliment when their work goes unnoticed.
For most of the history of film, if you wanted to insert something into the picture that didn't exist, the camera had to be stationary. Motion tracking allows artificial objects to be inserted convincingly into real footage. Phil Rhodes explains
From World War II to the 1980s, the model men and the optical effects units held sway in the world of movie VFX. Computers were on the way, but first the world's effects teams had to deal with the little problem of colour. By Andy Stout.