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enter image description here

I just modeled this thing, but when I switch to dev look mode these black lines on the side of the mesh. What are those and how do I get rid of them? I used the knife tool to add edges to get clean quads. Is it related to that?

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  • $\begingroup$ I just modeled this thing, but when I switch to dev look mode these black lines on the side of the mesh. What are those and how do I get rid of them? I used the knife tool to add edges to get clean quads. Is it related to that? $\endgroup$ – Benjamin Sep 7 '19 at 14:54
  • $\begingroup$ Difficult to tell just from the image can you share the blend file? $\endgroup$ – Samir Rahamtalla Sep 7 '19 at 19:22
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(Assuming Blender 2.80) Looks like there are two edges at (nearly) the same place. Go edit mode and "Merge Vertice->by Distance". Play around with the distance value a little bit. Make a backup of the file before.

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I played a bit around and found the problem. I've added new edges by connection to Points with F but this created a direct connection which interfered with the rest of the mesh.

I've solved it by just using the Knife Tool instead, but is there an easier way than the knife tool?

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    $\begingroup$ I like to add edges using a custom shortcut for the Subdivide tool. If you are in edge mode, go to Edge -> (and right-click) Subdivide. You will get the option to set a shortcut. I use alt-W because somebody else suggested it and it works well for me (deliberate, fast, no conflicts). You can quickly connect any two edges, double-tap "G" to slide them along those edges, and can insert 1 to 10 edges at a time. $\endgroup$ – hatinacat2000 Sep 8 '19 at 8:07

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