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Something is causing my mesh to show strange shadows along edges in render mode, but not in the material preview. I don't know what's causing it or how to fix it, so I'm hoping someone here has an idea.

Things I've tried so far that haven't worked:
• recalculating normals
• resetting vectors
• clearing custom normal split data
• disabling all modifiers
• hiding all other objects
• merging by distance and checking for non-manifold geometry
• shading flat, then smooth again (shadows are even worse when shaded flat)

If I import the same mesh in a new scene, this also happens, but I can't find any doubled faces, vertices, etc. in the mesh that could cause this.

Mesh in material preview: enter image description here

Mesh in shaded mode: enter image description here

Mesh in shaded mode & in edit mode: enter image description here

Mesh in shaded mode with flat shading on the object: enter image description here

Here's a minimal scene showing the problem:

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  • $\begingroup$ First thing to eliminate.. do you have any objects ( copies? ) hidden in the viewport, but not disabled from rendering? $\endgroup$
    – Robin Betts ♦
    Commented Jan 16, 2023 at 10:26
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    $\begingroup$ Yes, but I'm viewing it in the viewport, so this is the only object (and the light source) that is visible $\endgroup$
    – Aci
    Commented Jan 16, 2023 at 10:27
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    $\begingroup$ Thanks, I added the file to the post! $\endgroup$
    – Aci
    Commented Jan 16, 2023 at 10:45
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    $\begingroup$ Ahhh! got it to go! It looks to me like shadow termination.. the adjustment is the Object tab, Shading panel. Cost: a little blowing out of shadows. You may also try an extra level of subdiv. for render only, if needed, to prevent your viewport from creaking. See also, for example, here .. If we've found it, this Q may get clobbered as a duplicate .. :( .. :D $\endgroup$
    – Robin Betts ♦
    Commented Jan 16, 2023 at 17:16
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    $\begingroup$ Great! I hope you don't mind, nothing personal, but since this is the fix, I'm going to close this Q as a duplicate. We try to keep searches in the archive as simple as possible. $\endgroup$
    – Robin Betts ♦
    Commented Jan 17, 2023 at 11:32

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