Flat shading is the simplest shading model. We cover the advantages/disadvantages and a simple implementation in GLSL.

Diffuse shading is a technique to render the surface of objects that are not shiny. As an example, in the [picture (credits to Marc Kleen)](https://unsplash.com/photos/8hU6vtwY8l8), we see a real-life car with a matte coating, which we want to emulate using the Lambertian shading model.

Surface shading is a process to color a surface. In computer graphic applications, this is done to mimic how objects look in real life. This article covers the variables available in the rendering pipeline.