Salle de Bain is a typical interior scene that is simple to render with a unidirectional path tracer. Radiance-based path-guiding techniques improve the efficiency more than primary-sample-space path sampling does, with our NPG-Radiance performing the best among them at equal sample counts. The per-sample efficiency is further improved - in particular for the glossy reflections on polished wood - by incorporating the product of the BSDF and incident illumination (NPG-Product).

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