The light models seen in this chapter are extremely simple; no real material is perfectly matte or perfectly specular. Moreover, it is not uncommon for complex materials such as clothing, wood, and skin to require knowledge of how light scatters in the layers beneath the surface. Use the following table to recap the different lighting models encountered so far:
| Technique | Type | Light Intensity (I) |
| Lambertian | Diffuse |
 |
| Phong | Specular |
 |
| BlinnPhong | Specular |
There are other interesting models such as the Oren-Nayar lighting ...
