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

  1. 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).

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