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Mode 7The term Mode 7 originated on the SNES video game console, on which it describes a graphics mode that allows a background image to be rotated and scaled. By modifying the scaling and positioning of the image on a scanline-by-scanline basis a simple perspective effect can be applied, transforming the image into a 3D horizontal texture-mapped plane. Mode 7-style rendering is generally used on systems with strong 2D capabilities but no dedicated 3D support. Classic Mode 7 games include the SNES titles F-Zero and Super Mario Kart, both of which later revisited the effect in their Game Boy Advance incarnations. The SNES console had several screen modes, the seventh having an actual perspective effect for a single screen layer at the cost of all others. The Game Boy Advance version only has scaling and rotation, on two layers, on modes 2 and 3. Combined with HBlank effects (changing the scaling/rotation values on each scanline) a very convincing "mode 7" effect can be achieved. Many PC games, most notably Wacky Wheels, have a Mode 7 effect made by a third, completely software-based method.
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