area lighting

Analytic Spherical Harmonic Gradients for Real-Time Rendering with Many Polygonal Area Lights
Recent work has developed analytic formulae for spherical harmonic (SH) coefficients from uniform polygonal lights, enabling near-field …
Lifan Wu, Guangyan Cai, Shuang Zhao, Ravi Ramamoorthi
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Analytic Spherical Harmonic Gradients for Real-Time Rendering with Many Polygonal Area Lights