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This looks a lot like a smoothing effect to me. So I was wondering can we achieve this kind of low variance by first rendering the scene using the high variance setting and then applying specific filter before the "frame" gets displayed onto the screen?


@A-star The noise in the left image certainly is not desirable, and finding good ways to "smooth" out this noise (lower the variance) is key. At the same time, the objective of physics-based rendering is that the image be a photorealistic representation of the scene, so this needs to be done carefully; simply blurring the image won't necessarily give the desired effect.