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enter image description here enter image description here The angle value has been increased to get soft shadows with sun.
As the rendering progresses, the shadows appear to spread smoothly, but soon there are circular pattern artifacts.
This looks like a step phenomenon or constant interpolation.
I tried to manipulate all the values of the light and render properties, but couldn’t improve the artifacts. How can I improve this problem?
I’ve attached two blend files that I set up to help you solve my problem.
Work was done in blender 2.81.

file01
file02

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I think you're just seeing the difference in shadow rendering quality between preview and final render. If I load your scene, the preview looks similar to the above:

enter image description here

but a true F12-initiated render looks far better:

enter image description here

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  • $\begingroup$ The only difference is the number of samples, isn't it? $\endgroup$ – AndreKR Dec 5 '19 at 13:45
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    $\begingroup$ I think there are potentially other differences. In the example above, both the "Render" and "Viewport" controls were set to 4096, so it's not just that main sampling control. Also, in the Blender source, the Eevee code calls the function DRW_state_is_image_render() a bunch of times to check if this is a real render versus "just" a viewport render. I haven't looked at what, exactly, it does differently, but it seems to use lower vs. higher precision calculations for some things, takes some shortcuts, etc. $\endgroup$ – K. A. Buhr Dec 5 '19 at 19:12

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