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I have made a render, but the shadows appear to be blocky. I already researched this topic and almost every article says to do more subsurf, but I already did a lot of it and it doesn't work. Does anybody know how to fix this? Thanks in advance, Ice. enter image description here

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  • $\begingroup$ Looks like a normals issue. $\endgroup$ – Nate_Sycro27 Jun 4 '20 at 14:21
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This is called the "terminator artifact", and there's indeed few things you can do about it besides increasing the subsurf level to make the tiles less noticeable.

A workaround has been added to Blender to hide this, and was accepted on may 29th, but it's not yet available in the stable release.
Though it is available in the current daily build of version 2.90.

enter image description here

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