Surface Scattering
Surface Scattering in KostaCLOUD
Lambertian Scattering Model
Used for extremely diffusive surfaces. Perfect hemispherical scatter distribution.
Validity
Isotropic Surface Roughness
Ideal Diffuser.
Only valid for perfectly diffusing materials.
BSDF
Example Values
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"
References
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
ABg Scattering Model
Used for approximating smooth surface finishes.
Validity
Isotropic Surface Roughness
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.
BSDF
Example Values
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"
References
Approximated Scatter Models for Stray Light Analysis, Richard N. Pfisterer
Bidirectional Scattering Distribution Function (BSDF)
Sum of ABg Parameters. See ABg for more information.
Rayleigh-Rice Scattering Model
References
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
Beckmann-Kirchoff Scattering Model
References
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
Harvey-Shack Scattering Model
References
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
K-Correlation Scattering Model
References
J. E. Harvey, Understanding surface scatter phenomena: A linear systems formulation, SPIE Press, Bellingham (2019).
Last updated