Parallax Scrolling is a digital method of creating 2.5D graphics. The method is most popular in video games and one of the first uses appeared in 1982 in the arcade game Moon Patrol. The game was of a small moon buggy that traveled the surface, parallax scrolling takes place as the background lays move slower than the foreground creating the feeling that what is at the front is moving a large distance and that the background layers are further away than what they are. What you can see in Moon Patrol is the Buggy moving over fast bottom layer of floor. The next layer starts as mountains that move slower than the foreground. Behind that is then a layer of mountains that move even slower, the last layer is the still background image that usually is the sky but for the game is black to represent space.
Video Link to Moon Patrol Game play: http://www.youtube.com/watch?v=HBOKWCpwGfM
http://en.wikipedia.org/wiki/Parallax_scrolling
http://en.wikipedia.org/wiki/Side-scrolling_video_game
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