Manual registration between real and unreal elements has been done – Who Framed Roger Rabbit is a shining example of the technique – but usually involving visibly unreal objects.
Phil Rhodes explainsĬonvincing alignment between the apparent motion in the frame with the motion of an inserted, unreal visual effects element was simply beyond the sort of precision a human being can achieve, even given an animation stand and a stack of paper with punched registration holes, and even if it's OK for the job to take a week. Motion tracking allows artificial objects to be inserted convincingly into real footage. 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.
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