Oren–Nayar diffuse reflectance model
It has been shown to accurately predict the appearance of a wide range
of natural surfaces, such as concrete, plaster, sand, etc.
Here is a comparison with other models
| Oren-Nayar model |
Torrance-Sparrow model |
Microfacet model for refraction |
|---|
| Rough opaque diffuse surfaces |
Rough opaque specular surfaces (glossy surfaces) |
Rough transparent surfaces |
| Each facet is Lambertian (diffuse) |
Each facet is a mirror (specular) |
Each facet is made of glass (transparent) |
Phong reflection model
Phong shading may also refer to the specific combination of Phong interpolation and the Phong reflection model, which is an empirical model of local illumination. It describes the way a surface reflects light as a combination of the diffuse reflection of rough surfaces with the specular reflection of shiny surfaces. It is based on Bui Tuong Phong's informal observation that shiny surfaces have small intense specular highlights, while dull surfaces have large highlights that fall off more gradually. The reflection model also includes an
ambient term to account for the small amount of light that is scattered about the entire scene.
phong is the most common of all. it is a sum of the diffuse, ambient and specular creating a plastic look.
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