Richard van der Oost writes: When you’re rendering with Cycles, some areas of the image might already be looking nice and clean, while others are still very grainy. Wouldn’t it be amazing if you could laser-focus that expensive render time on those grainy bits? In a “smart” way?
from BlenderNation https://www.blendernation.com/2021/05/09/render-smarter-in-blender-with-adaptive-samples/
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