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I have extruded a wheel that originally looked like this:

enter image description here

My modified wheel now looks like this:

enter image description here

As you can see, the shading looks incorrect, with strange dips instead of a flat surface. But the normals seem ok to me:

enter image description here

Is there a way I can fix this? Is there some sort of issue with my vertices causing problems with interpolation?

Thank you!

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  • $\begingroup$ Did you maybe intend to use flat shading instead of smooth? $\endgroup$ – Leander Jun 14 '18 at 12:00
  • $\begingroup$ Avoid using n-gons (faces with more than 4 vertices). They cause all kinds of problems when subdivided or with smooth shading. $\endgroup$ – cegaton Jun 14 '18 at 14:20
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You need to remove these vertices. They are creating n-gons. You should strive towards quad based topology (4 sides).

enter image description here

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