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test/intern
Weizhen Huang e894e6a411 Fix: Cycles: wrong refractive index in path guiding
should be the relative IOR of the outgoing media to the incoming media,
depending on `bsdf->ior` and whether the interaction is refraction.
Reference paper: [Robust Fitting of Parallax-Aware Mixtures for Path Guiding](https://uni-tuebingen.de/fakultaeten/mathematisch-naturwissenschaftliche-fakultaet/fachbereiche/informatik/lehrstuehle/computergrafik/lehrstuhl/veroeffentlichungen/robust-fitting-of-parallax-aware-mixtures-for-path-guiding/) Eq (35)

Pull Request: https://projects.blender.org/blender/blender/pulls/112157
2023-09-18 16:20:48 +02:00
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