Modeling of light transfer using a modified method of vertex connection and merging, and multiple sampling by significance

For Russian citation (Opticheskii Zhurnal):

Вяткин С.И., Долговесов Б.С. Моделирование переноса света с применением модифицированного метода соединения и слияния вершин и множественной выборки по значимости // Оптический журнал. 2025. Т. 92. № 8. С. 62–71. http://doi.org/10.17586/1023-5086-2025-92-08-62-71

Vyatkin S.I., Dolgovesov B.S. Modeling of light transfer using a modified method of vertex connection and merging, and multiple sampling by significance [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 8. P. 62–71. http://doi.org/10.17586/1023-5086-2025-92-08-62-71

For citation (Journal of Optical Technology):

Abstract:

The subject of the study. The subject of the study is realistic computer graphics, which is based on physically correct modeling of light propagation. The article considers the task of rendering functionally defined scenes with a sample of significance to reduce variance. Multiple sampling by significance is used to reduce the variance of calculations. However, when sampling and weighting are not suitable for the integrand, calculations will have additional variance. Light transfer modeling based on sampling for different types of scenes has problems with the reliability of rendering algorithms. The purpose of the work. Development of a reliable method for modeling light transfer based on multiple significance sampling for various types of scenes. Method. A numerical integration method is proposed for better convergence and lower variance. The sampling strategy and the weight function are used to determine the sampling quality for both mirrored and non-mirrored functionally defined surfaces. The result is realistic rendering effects with a high convergence rate. Mirrored surfaces and their mirror shadows contain a large amount of detail with less noise. The main results. A sampling method of significance is proposed to increase the reliability of light transfer modeling. The approach combines the sampling method and the weighting function. A combination of bidirectional path tracing with method of vertex connection and merging, while maintaining the performance of bidirectional path tracing. Practical significance. As a result, a method has been implemented that effectively reduces variance in functionally defined scenes, while improving sample quality and generating realistic rendering effects.

Keywords:

method of vertex connection and merging, global lighting, sampling by significance, ray tracing

Acknowledgements:

the work was carried out with the support of the Ministry of Science and Higher Education as part of the work on State Assignment № 124041700102-4 in the IAE SB RAS

OCIS codes: 060.2330

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