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Texture Units

Short Version

Texture units (aka TMUs or texture mapping units) map textures onto 3D geometry. (see Texture Fill Rate )

Long Version

3D scenes are generally composed of two things: 3D geometry, and the textures that cover that geometry. Texture units in a video card take a texture and 'map' it to a piece of geometry. That is, they wrap the texture around the geometry and produce textured pixels which can then be written to the screen.

Textures can be an actual image, a light map, or even bump mapping. 

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