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Recently I had to cut one object into two, and I did it like this - I've selected mesh that I wanted to separate in Edit Mode, duplicated the object in Object Mode, then deleted my selection in Edit Mode in one object, and inversion of it in second object.

And because of this I am facing an issue right now, that you can see in screens below. Basically shading of some flat surfaces is wierd, depending on camera position in scene.

What doen't fix the issue (I tried)

  1. Regenerating UVs (every projection)
  2. Recalculating normals
  3. Not using normalmap or changing any material setting (it just made it less visible)
  4. Sun rotation or strength
  5. Rotation or position of object itself
  6. HDRi scene background
  7. Shade flat/smooth

Cycles Cycles second view Edit Mode mesh

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  • $\begingroup$ Hello please share your file: pasteall.org/blend $\endgroup$
    – moonboots
    Commented Mar 2, 2022 at 14:17
  • $\begingroup$ Unfortunatelly it's too big and also containg a model that I am not allowed to share :( $\endgroup$
    – H4nzzU
    Commented Mar 2, 2022 at 14:18
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    $\begingroup$ just share one piece of the object ;) $\endgroup$
    – moonboots
    Commented Mar 2, 2022 at 14:22
  • $\begingroup$ pasteall.org/blend/a07dbe4f5ebc4597a0d9ab25afeab43c :D $\endgroup$
    – H4nzzU
    Commented Mar 2, 2022 at 14:33

1 Answer 1

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From what it looks, it comes from the Anisotropy of the Principled BSDF (anisotropy is made for pan metal etc, it creates this radial effect):

enter image description here

enter image description here

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  • $\begingroup$ Thanks a lot! :D $\endgroup$
    – H4nzzU
    Commented Mar 2, 2022 at 15:02

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