I have a scene that I was troubleshooting for months in the first half of 2020. I have several essays worth of notes about this file and I’m revisiting it to see if I still have the same problem in newer versions of Blender.
In my notes at one point I say it seems the problem is caused by adaptive sampling. With viewport denoising I have no ugly areas but in the final render there are several areas that are turned into absolute trash by the denoiser (at render time) but not by the denoiser (in compositing).
Does anyone know if adaptive sampling happens in the viewport render and does adaptive sampling info get used as part of the at-render-time denoising process?