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enter image description heredonut showing lack of smoothness

I have done the set Shade Smooth, and deleted the faces then recreated it. It still looks like this.

Why?

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Try recalculating normals. In edit select faces/vertices and go to Mesh » Normals » Flip. Alternatively you can use the Alt + N shortcut

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  • $\begingroup$ Thanks man, it`s a normal problem, there is a extra polygon on the surface, which affect the normal vertex. Generally, it is the normal issue. thanks for your help. Have a nice day. $\endgroup$
    – XueCun Fan
    Oct 10 '21 at 2:28

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