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Ch. Luksch, L. Prost, M. Wimmer:
"Real-Time Approximation of Photometric Polygonal Lights";
in: "ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games", C. Casas Desantes (Hrg.); ACM Press, 2020, S. 1 - 18.

We present a real-time rendering technique for photometric polygonal lights. Our method uses a numerical integration technique based on a triangulation to calculate noise-free diffuse shading. We include a dynamic point in the triangulation that provides a continuous near-field illumination resembling the shape of the light emitter and its characteristics. We evaluate the accuracy of our approach with a diverse selection of photometric measurement data sets in a comprehensive benchmark framework. Furthermore, we provide an extension for specular reflection on surfaces with arbitrary roughness that facilitates the use of existing real-time shading techniques. Our technique is easy to integrate into real-time rendering systems and extends the range of possible applications with photometric area lights.

http://dx.doi.org/10.1145/3384537

https://publik.tuwien.ac.at/files/publik_291773.pdf