Dark shadow on some faces, already recalculated normals and merged vertices

Question

I'm encountered similar problems a few times and can't figure it out. I have simple low poly mesh, normals are correct and there are no extra vertices but still some faces look darker.

flat shading mode

Proof of no extra vertices https://gfycat.com/niftyshockedclingfish.gif

Merging faces by Distance with the default value only works, if the vertices share almost the exact same coordinate. It looks like you have copied vertices that are of by a tad more than that. Try Merge by Distance again, but change the distance value (bottom left corner) to a higher value — Zagstrug, May 30 '20 at 11:15
Looks quite like a duplicate of this https://blender.stackexchange.com/questions/133816/bad-shading-on-imported-mesh or linked one in there — Mr Zak, Apr 16 '21 at 19:15

score 1 · Answer 1 · answered Apr 16 '21 at 18:44

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This error is most probably caused by shade smooth. To fix this go to object data properties -> Normals -> Check the Auto Smooth Checkbox

answered Apr 16 '21 at 18:44

Maulik Sharma

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score 0 · Answer 2 · edited May 30 '20 at 13:22

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Did you try to shade flat (Object mode, right-click or press W and there is an option)? And move the vertex. Maybe there is more than one.

edited May 30 '20 at 13:22

Ray Mairlot

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answered May 30 '20 at 11:12

Kat Suvii

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There is no extra vertices I checked few times and the image I posted is already flat shaded. Also I tried smooth shaded too but nothing changed. – KüllüUkalaTatlısı May 30 '20 at 11:17
select those dark faces and press on f3 and search for flipped normals try that – Kat Suvii May 30 '20 at 11:25
Nothing changed :( – KüllüUkalaTatlısı May 30 '20 at 11:32

Dark shadow on some faces, already recalculated normals and merged vertices

2 Answers2