Per-pixel lighting
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In computer graphics, per-pixel lighting is commonly used to refer to a set of methods for computing illumination at each rendered pixel of an image. These generally produce more realistic images than vertex lighting, which only calculates illumination at each vertex of a 3D model and then interpolates the resulting values to calculate the per-pixel color values.
Per-pixel lighting is commonly used with other computer graphics techniques to help improve render quality, including bump mapping, specularity, phong shading, and shadow volumes.
Real-time applications, such as computer games, which use modern graphics cards, will normally implement per-pixel lighting algorithms using pixel shaders. Per-pixel lighting is also performed on the CPU in many high-end commercial rendering applications which typically do not render at interactive framerates.
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