Rotoscoping

Rotoscoping is a technique in films and animations that is used to trace over live action . The technique was invented and made by Max Fleischer who firstly used the technique in a American series 'Out of Inkwell' . He later on went to patent the rotoscoping technique in 1917

Warner Bros productions like Looney tunes also used rotoscoping which an occasional technique to make the cartoons look more exaggerated .

Rotoscoping was also used in countries like China where they used it for a first animated feature film 'Princess Iron Fan ' in 1941 . 

Rotoscoping was also used in Ralph Bakshi's animated 1978 film 'The Lord of the Rings' .

The film 'Heavy Metal' directed by Gerald Potterton also used the rotoscoping technique . In the film a bomber plane B-17 was animated into the film with rotoscoping . Also The shot of the exploding house at the end of the Grimaldi sequence was originally to be rotoscoped however as the film's release date had been moved from October/November to August 7, 1981, a lack of time prevented this which makes it the only sequence in the film is non-animated . 

Rotoscoping could be used in After Effects to make objects float or make objects seem that they are where .