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I have a problem with the graininess that appears in the shade. I want to render an object with a nice and clean shadow. The result is a png with a transparent background.

Render in Cycles engine. I have enabled Shadow Catcher, Transition, RGBA, Denoising - OpenImageDenoise . The number of Samples is 1000.

Can I fix this problem somehow?

enter image description here

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    $\begingroup$ Does this answer your question? Shadow-catcher stays noisy even with Denoising - also very dark $\endgroup$
    – Mehdi
    Apr 13, 2021 at 9:47
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    $\begingroup$ One way to solve this problem is to render the shadow catcher in a separate view layer. Then, in the compositor, add a blur node for this view layer, then alpha over the other layer. C.f. linked question. $\endgroup$
    – Mehdi
    Apr 13, 2021 at 9:48

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This may not be ideal, but I solve this issue by passing the "Alpha" from "Render Layers" through a HDR Denoiser, then use the denoised alpha map to blend with the background image to generate the noise free shadow.

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  • $\begingroup$ Hi, thanks for help but it still doesn't work. I created nodes in compositor: ibb.co/xq72WgV , but result is still same $\endgroup$
    – cancelojao
    Apr 5, 2021 at 9:23
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I was dealing with the same issue in a very similar scenario, I bumped up the samples to 2500 and used NLM denoise. I tried many other tricks and variations but to this date, couldn't find a better solution other than just using more samples.

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