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SCATMECH > Classes and Functions >
Property Models
> Reflectance
Abstract class Reflectance
The class Reflectance is an abstract class for describing the
diffuse reflectance of a substrate. Reflectance is
used by Lambertian_BRDF_Model and Diffuse_Subsurface_BRDF_Model, where
beforehand the reflectance was described by a Table. Three different instantiable classes
inherit the properties of Reflectance:
Instantiable Models and Their Parameters:
| Parameter |
Data
Type |
Description |
Default |
Table_Reflectance:
A simple reflectance whose wavelength dependence is obtained from a
table of values. |
| table |
Table |
The reflectance, given either as the name of a file containing the reflectance as a function of
wavelength, or as a constant value. |
1 |
Equation_Reflectance:
A reflectance given by an equation as a function of wavelength (given by x in the equation).
|
| expression |
string |
An expression (given by a function of the wavelength, x) for the reflectance.
|
1 |
Kubelka_Munk_Reflectance:
A reflectance given by the theory of Kubelka and Munk [Z. Tech. Phys. 12, 593 (1931)] for a paint
coating having specific scattering and absorption coefficients and thickness and substrate reflectance. |
| thickness |
double |
The thickness of the coating [µm]. |
1 |
| absorption |
Table |
The Naperian (base e) absorption coefficient as a function of wavelength [1/µm].
|
0 |
| scattering |
Table |
The Naperian (base e) scattering coefficient as a function of wavelength [1/µm].
| 1 |
| substrate |
Reflectance_Ptr |
The reflectance of the underlying material
| Table_Reflectance |
See also:
SCATMECH Home,
Lambertian_BRDF_Model,
Diffuse_Subsurface_BRDF_Model
Include file:
#include "reflectance.h"
Source code:
reflectance.cpp
Definition of public elements:
class Reflectance : public Model {
virtual double Get_Reflectance(double lambda) = 0;
};
typedef Model_Ptr<Reflectance> Reflectance_Ptr;
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This function evaluates the reflectance at wavelength lambda.
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Current SCATMECH version: 7.22 (April 2021)
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