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[Max] I need help! / Re: Noise patches
« on: 2023-06-07, 01:24:25 »Corona uses adaptivity, to prioritize which lights get more calculations in which areas of the image. In this case, your bright sunlight from the other HDRI is leading the way as needing the highest priority as "the most important light" for that area in the image, which results in other lights falling in that area getting less processing.
You could leave everything rendering until that patch clears up for the version where the sun patch is turned off.
Or you make all lights a similar intensity when rendering, e.g. this HDRI could be turned down in intensity so that it is "too dark", that way all lights get equal consideration. It may look odd in the Beauty, or even in single render elemetns, but you then render until the image is clean, and all lights will be equally clean, and you can adjust their intensities in LightMix to boost them back up, and there should be no noisy patches when a bright light source is turned off in LightMix.
Or you can turn off adaptivity, as another approach, forcing Corona to treat all lights equally anyway.
Thank you Tom, this helped me understand a lot, i am fairly new at this so all these comments from you guys are of a great help. I've run a quick low-res render and sure enough no more noisy and burned out spots.