Flat shading

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Flat shading is a technique of drawing a 3D model where each model's polygon is rendered by color calculated from polygon's angle relative to a light source. The flat shading is relative simple and requires calculation of only one normal per polygon/triangle. Disadvantage of flat shading is is faceted look of low polygon/triangle count models.

A sphere rendered in OpenGL using flat shading model
A sphere rendered in OpenGL using flat shading model
The same sphere rendered by POV-Ray raytracer
The same sphere rendered by POV-Ray raytracer

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