Light Behavior Models
For transmission and reflection, light behavior is described with a combination of three models.
Note: With these models you can create precise surface taking into account that you can use them to
define light's behavior with regards to wavelength and polarization.
Specular model |
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Rays propagate following the Snell - Descartes law. The proportion of transmitted and reflected rays is given by the Fresnel laws (Optical polished and Scattering models). |
Lambertian model |
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The probability to be reflected in a given direction is the same for all the direction of the space. |
Gaussian model |
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The light has a Gaussian probability to be reflected with a particular angle around the main direction defined by Snell - Descartes laws. |
Specular reflection on a surface 
Lambertian reflection and transmission on a surface. 
Reflection: Gaussian (10%) and Lambertian (90%).