Surface Scattering
Surface Scattering in KostaCLOUD
Used for extremely diffusive surfaces. Perfect hemispherical scatter distribution.
- Isotropic Surface Roughness
- Ideal Diffuser.
- Only valid for perfectly diffusing materials.
Where
,
where R is the reflectivity of the sample.
These values below were provided by the reference below, and re-presented here. These values are built into the "Simplistic Presets", where the idea of this table for this model in Rich Pfisterer's words: "Approximated Scatter Model"
Surface | R |
---|---|
Ideal diffuser | 1 |
Typical matte paper at normal incidence | 0.85 |
Typical diffuse black paint at normal incidence | 0.5 |
Perfect absorber | 0 |
- 1.J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
Used for approximating smooth surface finishes.
- Isotropic Surface Roughness
- RMS Surface Roughness(Smooth Surfaces)
- Surface Roughness is Bandwidth Limited. I.e. The roughness is not just a single sinusoidal frequency, but a spread of frequencies about some dominant frequency.
- Simplistic Model, Ideal for quick turn-around. Wavelength dependence, and model parameters may differ from reality.
Where
,
with some fitting parameters: A,B, and g.
These values below were provided by the reference below, and re-presented here. These values are built into the "Simplistic Presets", where the idea of this table for this model in Rich Pfisterer's words: "Approximated Scatter Model"
Mirrors
Lenses
Polish | g | B | A |
---|---|---|---|
Super | 2.5 | 0.00001 | |
Slightly better than Standard | 2.0 | 0.0001 | |
Standard | 1.5 | 0.001 | |
Slightly worse than Standard | 1.0 | 0.01 | |
Polish | g | B | A |
---|---|---|---|
Super | 2.5 | 0.00001 | |
Slightly better than Standard | 2.0 | 0.0001 | |
Standard | 1.5 | 0.001 | |
Slightly worse than Standard | 1.0 | 0.01 | |
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
Last modified 3mo ago