Definitions for "Flat Shading"
(v) A rendering method that uniformly adjusts the value of a surface color based on its orientation to the light. This method is considered the simplest shading method since it only requires the calculation of a single surface normal.
Refers to a primitive colored with a single, constant color across its extent, rather than smoothly interpolated colors across the primitive. See Gouraud shading.
A method in 3D rendering where each polygon is made using only 1 colour. This would be created in real life by a strong light directly in front of an object as to create no shadows. This is fast performance, but and unrealistic approach.