PHYSICALLY CORRECT DIRECT LIGHTING FOR DISTRIBUTION RAY TRACING
Changyaw Wang, Indiana University, Bloomington, Indiana
Publisher Summary
The direct lighting component in distribution ray tracing is calculated by performing a numerical integration, accounting for all potentially visible luminaires. This chapter presents a physically correct method for calculating the contribution from spherical and triangular luminaires. For an environment with multiple luminaires, there is an integral for each luminaire, and the direct lighting is the sum of those integrals. Because of the difficulty in computing the solid angle of a triangle and finding a sample direction within the solid angle, the solid angle of a triangular luminaire is approximated ...
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