“Analytic spherical harmonic gradients for real-time rendering with many polygonal area lights” by Wu, Cai, Zhao and Ramamoorthi
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- Analytic spherical harmonic gradients for real-time rendering with many polygonal area lights
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We develop an analytic formula for spatial gradients of the spherical harmonic coefficients for uniform polygonal area lights, enabling scaling PRT to hundreds of area lights with real-time frame rates.
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