TnL or T&L, short for Transform and Lighting it refers to a hardware
feature found on some graphics cards
. TnL is separate engines on the GPU
that enable extremely high polygon count scenes. With TnL technology some or all of the 3-D information normally processed by the computer processor
is processed by the GPU. Transform performance determines how complex objects can be and how many can appear in a scene without sacrificing frame rate. Lighting techniques add to a scene's realism by changing the appearance of objects based on light sources.
Also see Understanding Video and Graphics Adapters in Webopedia's "Did You Know...?" section.
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