class Facet_BRDF_Model
The class Facet_BRDF_Model implements the specular
point theory for scattering from very rough surfaces. In
SCATMECH version 3, the class was modified to include
a slope distribution 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 scattering is evaluated in reflection (0) or
transmission (1). (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. | Exponential_Slope_Distribution_Function |
| stack | dielectric_stack | Description of any stack
of films deposited on the substrate, usually specified
by a file. The films are assumed to be conformal and of
total thickness much less than the horizontal scale of
the roughness. See dielectric_stack, for more information. (Inherited from Facet_BRDF_Model). |
no films |
See also:
SCATMECH Home, Conventions, BRDF_Model, Roughness_BRDF_Model, Torrance_Sparrow_BRDF_Model, Subsurface_Facet_BRDF_Model, Slope_Distribution_Function
D. E. Barrick, "Rough surface scattering based on the specular point theory," IEEE Trans. Ant. and Prop. AP-16 (4), 449-454 (1968).
Include file:
#include "facet.h"
Source code:
facet.cpp reg_facet.cpp
Definition of public elements:
class Facet_BRDF_Model : public BRDF_Model { public: virtual double local_angle(double thetai,double thetas,double phis); virtual double local_slope(double thetai,double thetas,double phis); }; typedef Model_Ptr<Facet_BRDF_Model> Facet_BRDF_Model_Ptr;
virtual double local_angle(double thetai,double thetas,double phis)
Function that returns the local angle of reflection on a specular point for a specific scattering geometry.
virtual double local_slope(double thetai,double thetas,double phis)
Function that returns the slope of a facet, which specularly reflects for a specific scattering geometry.
typedef Model_Ptr<Facet_BRDF_Model> Facet_BRDF_Model_Ptr
The typedef Facet_BRDF_Model_Ptr behaves like a pointer to an instance of class Facet_BRDF_Model. The following statement will query the user for an instance of class Facet_BRDF_Model:
Facet_BRDF_Model_Ptr model = Get_Model_Ptr();The next statement will also create an instance of class Facet_BRDF_Model:
Facet_BRDF_Model_Ptr model = "Facet_BRDF_Model";See Model_Ptr<model>.
For More Information
SCATMECH Technical Information and Questions
Optical Technology Division (OTD) Home Page
OTD Technical Inquiries
OTD Website Comments
Current SCATMECH version: 6.00 (February 2008)
This page first online: Version 1.00 (March 2000)
This page last modified: Version 6.00 (February 2008)