Approximation of the distribution function of the reflectiveness of the surface by the third-degree polynom

Authors

  • O. N. Romanyuk Vinnytsia National Technical University
  • A. V. Snigur Vinnytsia National Technical University
  • O V. Romanyuk Vinnytsia National Technical University
  • L. G. Koval Vinnytsia National Technical University
  • E. K. Zavalnyuk Vinnytsia National Technical University

DOI:

https://doi.org/10.31649/1681-7893-2023-46-2-37-43

Keywords:

bidirectional reflectance distribution function, cubic polynomial, rendering, Blinn-Phong model, high productivity

Abstract

In the article a bidirectional reflectance distribution function based on a polynomial of the third degree is developed. The main disadvantages of Schlick, Phong, Blinn reflectance models are analyzed. The approximation of Blinn-Phong model by a cubic polynomial is proposed to improve the productivity of three-dimensional image formation. Formulas for the coefficients of the approximation cubic polynomial are calculated. The disadvantages of using the proposed cubic polynomial for reproducing the glare’s attenuation zone are considered. A function for high-precision reproduction of this zone is proposed, formulas of its coefficients are calculated. A combined function, combining a cubic polynomial for reproducing the glare’s epicenter zone and a function for reproducing the attenuation zone, is proposed. The plot of the combined function is built. It is shown that the combined function reproduces the glare’s epicenter and attenuation zones with small relative and absolute errors. The developed reflectance model provides a highly-productive formation of three-dimensional scenes in computer graphics systems. The proposed distribution function of surface reflectivity can be used in computer graphics systems.

Author Biographies

O. N. Romanyuk, Vinnytsia National Technical University

д.т.н., професор, завідувач кафедри програмного забезпечення

A. V. Snigur, Vinnytsia National Technical University

к.т.н., доцент кафедри обчислювальної техніки

O V. Romanyuk, Vinnytsia National Technical University

к.т.н., доцент кафедри програмного забезпечення

L. G. Koval, Vinnytsia National Technical University

к..т.н., доцент, зав. каф. біомедичної інженерії та оптико-електронних систем

E. K. Zavalnyuk, Vinnytsia National Technical University

аспірант

References

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Published

2023-12-13

How to Cite

[1]
O. N. Romanyuk, A. V. Snigur, O. V. Romanyuk, L. G. Koval, and E. K. Zavalnyuk, “Approximation of the distribution function of the reflectiveness of the surface by the third-degree polynom”, Опт-ел. інф-енерг. техн., vol. 46, no. 2, pp. 37–43, Dec. 2023.

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Section

OptoElectronic/Digital Methods and Systems for Image/Signal Processing

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