class First_Diffuse_BRDF_Model
The class First_Diffuse_BRDF_Model is a
BRDF_Model which describes the
singly scattered light in a diffuse medium with a flat,
smooth interface. It assumes that the light is scattered by
Rayleigh-Gans scattering with a local angular distribution
given by a specified phase function. The abstract class
Phase_Function provides a specific
phase function. The model requires a mean free path for
scattering, and uses the imaginary part of the optical
constant to determine the mean free path for absorption. If
the material is not absorbing, the result does not depend
upon the mean free path of scattering.
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) |
| l_scat | double | The mean free path for scattering [µm]. If the material is lossless (the optical constant is real), then l_scat has no effect on the resulting scattering function. | 1 |
| phase_function | Phase_Function_Ptr | The bulk scattering function, specifying by the probability that light will scatter by a given angle each time it scatters. | Henyey_Greenstein_Phase_Function |
| stack | dielectric_stack | Description of any stack
of films deposited on the substrate, usually specified
by a file. See dielectric_stack, for more
information. |
no films |
See also:
SCATMECH Home, Conventions, BRDF_Model, dielectric_stack
Thomas A. Germer, "Polarized light diffusely scattered under smooth and rough surfaces," in Polarization Science and Remote Sensing, J. A. Shaw and J. S. Tyo, Eds., Proc. SPIE 5158, 193-204 (2003).
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: 6.00 (February 2008)
This page first online: Version 4.00 (July 2003)
This page last modified: Version 6.00 (February 2008)