Non-photorealistic rendering (NPR) is a subject that has been generating quite a bit of interest in the computer graphics community lately. This is partly because any advance in the area is so rapidly picked up by authors who create actual content. The term NPR covers any computer-generated imagery explicitly rendered using techniques designed not to mimic physical reality. Most frequently, NPR rendering is performed by a program that takes images or three-dimensional geometry as input and creates a new output image within the bounds of a given artistic style.
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