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Graphical effects taking advantage of the way raster scan video works. (Drawing the screen in lines starting at the top right.) Done by changing the contents of the video memory or graphics registers as the screen is drawn, to do weird stuff like displaying more colours onscreen than a machine is capable of through changing the palette register, or vertical scaling by moving an image about as the screen is drawn. Examples being copper bars, the fake transparencies in Gunstar Heroes and the roads in many an 8 or 16-bit racing game. Very popular with demo coders

The raster in Axeley is so kewl that it convinced two people (possibly more) to buy a SNES

See also: raster interrupts

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