Real-time Shading with Free-form Planar Area Lights using Linearly Transformed Cosines
Автор: morishimalab
Загружено: 2022-04-19
Просмотров: 481
Takahiro Kuge, Tatsuya Yatagawa, Shigeo Morishima
i3D 2022
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abstract
This article introduces a simple yet powerful approach to illuminating scenes with free-form planar area lights in real time. For this purpose, we extend a previous method for polygonal area lights in two ways. First, we adaptively approximate the closed boundary curve of the light, by extending the Ramer–Douglas–Peucker algorithm to consider the importance of a given subdivision step to the final shading result. Second, we efficiently clip the light to the upper hemisphere, by algebraically solving a polynomial equation per curve segment. Owing to these contributions, our method is efficient for various light shapes defined by cubic Bézier curves and achieves a significant performance improvement over the previous method applied to a uniformly discretized boundary curve.
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