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I'm trying to make grooves on my jar lid, but the lines aren't staying straight. They're curving into an arch at the end. Can someone help me fix this? I've looked everywhere for answers.

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That's totally normal behaviour.

The solution for this is UV Editing:

enter image description here

I just added here a simply cylinder to make it clear.

The wave texture is set to Bands/x, so Blender calculates the wave according to the x coordinate. Knowing that and using your math knowledge you recognize, that Blender does this perfectly right.

So how can you change that?

You can change the x-coordinates, if you are using UV coordinates in your texture coordinate node instead of generated coordinates. These x-coordinates (1) you can influence by uv-editing. So make sure that your vertical faces (2) are mapping in even faces in uv editing (1). Then use the uv coordinates (3) in shader nodes and everything works as expected.

enter image description here

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    $\begingroup$ thanks!!! didn't know it was so simple. Flew didn't notice this $\endgroup$
    – Henry
    Commented May 16 at 9:04
  • $\begingroup$ glad if i can help $\endgroup$
    – Chris
    Commented May 16 at 9:09
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    $\begingroup$ @Henry .. don't forget to upvote, too, if you think this is a good one :) $\endgroup$
    – Robin Betts
    Commented May 16 at 11:06
  • $\begingroup$ thanks, will do! $\endgroup$
    – Henry
    Commented May 22 at 19:32

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