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weizhen/blender:fix-path-guiding-eta
main
#ifdef
#if
should be the relative IOR of the outgoing media to the incoming media, depending solely on `bsdf->ior` and whether the interaction is refraction. Ref: https://uni-tuebingen.de/fakultaeten/mathematisch-naturwissenschaftliche-fakultaet/fachbereiche/informatik/lehrstuehle/computergrafik/lehrstuhl/veroeffentlichungen/robust-fitting-of-parallax-aware-mixtures-for-path-guiding/
