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I've modeled the following screw on which I have applied a subdivision. I managed to fix most of its bad topologies, but I can't wrap my head around the following scenario. I have this heptagon that I want to convert to quads and I have been googling for help for the past two hour without success. I just don't understand how to fix this.

I am assuming I need to convert the heptagon to quads, but I might be wrong.

Enter image description here

Enter image description here

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  • $\begingroup$ could you add your blend file so I can play with the geometry? (How to add a blend file) Meanwhile, do you have autosmooth on? You should be able to get away with geometry similar to what you have $\endgroup$ Sep 7 '21 at 19:10
  • $\begingroup$ Oh, I didn't knew I could upload blend files. Here it is: blend-exchange.com/b/gkDrvMeN $\endgroup$ Sep 7 '21 at 19:12
  • $\begingroup$ Wow, that is indeed a rough problem. I can add geometry that moves the issue around but I can't really come up with a way to fix it. $\endgroup$ Sep 7 '21 at 19:31
  • $\begingroup$ Yes, this is very strange. Even if I extend the three lines to the next side of the screw, the hollows keep appearing at the same place... even though I make the twist more prominent. Thanks for having took a look at it! $\endgroup$ Sep 7 '21 at 19:38
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This kind of topology works fine in my opinion but I got rid of all your modifiers (not sure how they are useful):

enter image description here

enter image description here

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    $\begingroup$ Faster again. I'm not even surprised anymore :) $\endgroup$ Sep 7 '21 at 19:45
  • $\begingroup$ thanks but I'm not sure if I'm good as I don't understand what all these modifiers are for ;) $\endgroup$
    – moonboots
    Sep 7 '21 at 19:48
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    $\begingroup$ They add bevels to the screw's edges by using vertex groups. Otherwise the edges become smooth like on your screenshot. I do that to keep my model low-poly. $\endgroup$ Sep 7 '21 at 19:51
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I usually work around it with non-square quads.
It works reasonably well with the Subdivision Modifier.

enter image description here

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