class First_Diffuse_BRDF_Model
The class First_Diffuse_BRDF_Model is a
BRDF_Model that describes the
singly scattered light in a diffuse medium with a flat, smooth
interface. It assumes that the light is scattered by a
given Polarized_Phase_Function.
The model uses the imaginary part of the optical constant of
the medium and the absorption coefficient in
the Polarized_Phase_Function to
determine the total absorption coefficient. In general, one
would add a Lambertian contribution
(using Lambertian_BRDF_Model
or Diffuse_Subsurface_BRDF_Model) to
the result to account for multiply scattered light.
Parameters:
| Parameter | Data Type | Description | Default |
|---|---|---|---|
| lambda | double | Wavelength of the light
in vacuum [µm]. (Inherited from BRDF_Model.) |
0.532 |
| type | int |
Indicates whether the light is incident from above the
substrate or from within the substrate and whether the
scattering is evaluated in reflection or transmission.
The choices are: 0 : Light is incident from the above the substrate, and scattering is evaluated in reflection. 1 : Light is incident from the above the substrate, and scattering is evaluated in transmission. 2 : Light is incident from the within the substrate, and scattering is evaluated in reflection. 3 : Light is incident from the within the substrate, and scattering is evaluated in transmission. For 1, 2, and 3, the substrate must be non-absorbing. First_Diffuse_BRDF_Model only supports type=0. (Inherited from BRDF_Model). |
0 |
| substrate | dielectric_function | The
optical constants of the substrate, expressed as a
complex number (n,k) or, optionally, as a function of
wavelength. (Inherited from BRDF_Model.) |
(4.05,0.05) |
| depoll | double | Linear depolarization coefficient. This parameter adds additional depolarization proportional to the distance traveled in the material. | 0 |
| depolc | double | Circular depolarization coefficient. This parameter adds additional depolarization proportional to the distance traveled in the material. | 0 |
| phase_function | Polarized_Phase_Function_Ptr | The bulk scattering function, specifying by the probability that light will scatter by a given angle each time it scatters. Polarized_Phase_Function also handles the scattering and absorption coefficients. | Unpolarized_Phase_Function |
| stack | StackModel_Ptr | Description of any stack of films deposited on the substrate. | No_StackModel |
See also:
SCATMECH Home, Conventions, BRDF_Model, dielectric_stack
Include file:
#include "firstdiffuse.h"
Source code:
firstdiffuse.cpp
Definition of public elements:
class First_Diffuse_BRDF_Model : public BRDF_Model { };
For More Information
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Current SCATMECH version: 7.22 (April 2021)