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I am trying to make a cake stand. Here is what it looks like: enter image description here

And here is it in wireframe: enter image description here

The thing is, when I use a reflective material, I can see these lines running along the face of the cylinder and I can't seem to get rid of them (I've tried adding additional edge loops to no avail):

enter image description here enter image description here

To be specific, I'm talking about the lines that kind of look like the old Japanese flag: enter image description here

What are these and how do I get rid of them?

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This is called pinching. This happens because you have single vertex with a lot of edges.

Pinching

You can improve it by deleting the vertex and adding a n-gon in the middle.

wireframe

This is not ideal solution in every case because there is the n-gon in the middle but for rendering it works quite well.

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    $\begingroup$ .. you could grid-fill after an inset, if you wanted all quads. $\endgroup$
    – Robin Betts
    Commented Oct 1, 2020 at 9:37

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