class Shadowed_Facet_BRDF_Model
The class Shadowed_Facet_BRDF_Model
implements the facet scattering model with shadow
functions. Note: this class only implements the polarized
part of the scattering function; a Lambertian contribution
must be added to the scattering function to account for
multiply scattered light. The shadow function is supplied
using the abstract class Shadow_Function.
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. (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) |
| sdf | Slope_Distribution_Function | Function
describing the isotropic two-dimensional distribution
of surface slopes. (Inherited from Facet_BRDF_Model.) |
Exponential_Slope_Distribution_Function |
| stack | StackModel_Ptr | Description of any stack
of films deposited on the substrate.The films are assumed to be conformal and of
total thickness much less than the horizontal scale of
the roughness. (Inherited from Facet_BRDF_Model). |
No_StackModel |
| sdf | Shadow_Function | Function describing the shadowing and obscuration. | Torrance_Sparrow_Shadow_Function |
See also:
SCATMECH Home, Conventions, BRDF_Model, Facet_BRDF_Model, Shadow_Function
Include file:
#include "torrspar.h"
Source code:
torrspar.cpp
Definition of public elements:
class Shadowed_Facet_BRDF_Model : public Facet_BRDF_Model { };
For More Information
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Current SCATMECH version: 7.22 (April 2021)