Parameters of a Retro Reflecting Surface

Note: Absorption is an auto-calculate value. Total Reflection plus Absorption is equal to one hundred percent.

Lambertian

In Lambertian box, you must type a Lambertian diffusion value in percent.

Back Scattering

Backscattering is the reflection of light, waves or particles back to the direction from which they came (back towards the source).

In Specular box, you must type a specular reflection value in the incident direction in percent.
In Gaussian box, you must type a Gaussian diffusion value in the incident direction in percent.
In Gaussian angle (FWHM) box, you must type a Gaussian angle value in the incident direction in degree.
FWHM angle (Full Width at Half Maximum) is used as following.

Front Scattering

Front or forward scattering is a scattering in which most of the photons end up traveling in roughly the direction they started. Forward scattering is always accompanied by some backscattering.

In Specular box, you must type a specular reflection value in the classical reflection direction in percent.
In Gaussian box, you must type a Gaussian diffusion value in the classical reflection direction in percent.
In Gaussian angle (FWHM) box, you must type a Gaussian angle value in the classical reflection direction in degree.