Abstract

To simulate lighting systems, we developed a rough surface ray-tracing (RSRT) model on the basis of the facet model. The model needs to conserve energy to analyze how much light is lost in each component in the lighting system. Though a single scattering rough surface model with a shadowing/masking function successfully describes the scattering distribution, masking output light violates the energy conservation law because it lacks multiple scattering. We thus developed an advanced RSRT (A-RSRT) model satisfying the energy conservation law that includes a shadowing/masking effect as a consequence of multiple scattering. To determine the accuracy, we set up a real shape (RS) model that outputs rigorous simulation results, although this RS model was impractical. The comparisons between the calculated results of the A-RSRT and RS models revealed that the A-RSRT model satisfied the energy conservation law and reproduced the scattering distribution precisely.

© 2016 Optical Society of America

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