I am using Cycles and yet it doesn't appear.
It doesn't work even when I'm using the denoiser node.
please any advice would be welcomed.
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2 Answers
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The option is hidden in the Viewer Layer Properties panel. There you will find the Denoising Data checkbox. (In Blender 2.9x it's under Passes → Data.) Tick the checkbox and the Render Layers node will get some extra sockets for the Denoise node.
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"Denoiser" in View Layer Properties was moved to Data--> Denoising Data as mentioned above, and it works.
Additionally, for Cycles Renders (starting in Blender 2.81 onward) there is now a Denoising Filter that can be editing in the Compositor, which does a wonderful job Denoising in Renders where the "Data--> Denoising Data" still renders with noise.
Zach Reinhardt did a walkthrough comparing/contrasting both denoiser options in this tutorial: Denoising in Blender Cycles Rendering
