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Modified polarized geometrical attenuation model for bidirectional reflection distribution function based on random

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    This study introduces a modified polarized geometrical attenuation model, improving bidirectional reflectance distribution function (BRDF) accuracy by incorporating polarization effects and random surface microfacets. The new model offers better physical rationality and wider applications.

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    Area of Science:

    • Optics
    • Computer Graphics
    • Materials Science

    Background:

    • Blinn's geometrical attenuation model is standard for optical BRDF models.
    • This model has inaccuracies due to V-groove assumptions and ignores polarization.
    • Existing models fail to accurately represent polarized light interactions with surfaces.

    Purpose of the Study:

    • To develop a modified polarized geometrical attenuation model.
    • To address the limitations of Blinn's model, particularly regarding polarization.
    • To enhance the accuracy and applicability of BRDF models.

    Main Methods:

    • Developed a modified polarized geometrical attenuation model.
    • Integrated masking, shadowing, and polarization effects.
    • Utilized random surface microfacet theory.
    • Derived separate expressions for p-polarized, s-polarized, and unpolarized attenuation functions.

    Main Results:

    • The modified model demonstrates improved physical rationality.
    • Enhanced precision in bidirectional reflectance distribution function (BRDF) curves.
    • Experimental validation with two sample surfaces confirmed accuracy.
    • The model successfully accounts for polarization effects.

    Conclusions:

    • The modified polarized geometrical attenuation model offers superior performance over Blinn's model.
    • Improved BRDF accuracy and physical realism are achieved.
    • The model's applicability is expanded to various polarization scenarios.