Dawn's first film Missions of California made extensive use of the glass shot, in which certain parts of the intended image are painted on a piece of glass and placed in between the camera and the live action.
Norman O. Dawn (25 May 1884 – 2 February 1975) was an early American film director. He made several improvements on the matte shot to apply it to motion picture, and was the first director to use rear projection in film production.
The main difference between the glass shot and the matte shot is that with a glass shot, all filming is done with a single exposure of film.
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