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I downloaded an .obj-file, and imported it into Blender 2.81, and I get some smooth surfaces - all is good, but I would like to see the flat version, so I go to Object Mode, Object, Shade Flatten - all is still fine.

I then find out I have a lot of duplicates, which I remove from Edit Mode, Mesh, Clean Up, By Distance.

If I then try to smooth it again, I get these weird blobs: Weird blobs on faces

I tried editing the Object Data Property for Normals, Auto Smooth, but that makes no difference from 0 to 180 degrees.

When I click on the individual vertices it looks fine by showing the nearby vertices they are connected to.

What have I done wrong?

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    $\begingroup$ Did you try clearing the "custom split data" in the object data properties ? It is in a foldout under the normals auto-smooth field $\endgroup$
    – Gorgious
    Jan 26, 2020 at 10:52
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    $\begingroup$ This indeed does the trick. And now Auto Smooth actually does something :D $\endgroup$ Jan 26, 2020 at 14:39

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