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I'm using blender 2.8 and this issue occurred while I was retopologizing something using the poly build tool.

Subdivision surface is create a weird thorn-like curve and I can't figure out why. My unmodified mesh looks fine.

Let me just show you the images because its probably hard to figure out what I'm saying through text alone. I lack the knowledge to accurately describe what I'm seeing here.

Image with subsurf: enter image description here

Image without subsurf: enter image description here

Normals (definitely hard to see, but they're all pointing the same direction): enter image description here

UPDATE: So I solved the issue, but I still don't know what caused it. I selected the whole mesh, and deleted loose. That gave me a face with 6 vertices. Creating an edge by selecting the two middle vertices and pressing f recreated the issue; However, using the knife tool to cut the new face solved the issue. I somebody knows what this means, please let me know. Thanks.

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    $\begingroup$ you must have an edge inside, please share your original file $\endgroup$
    – moonboots
    Commented May 19, 2019 at 8:32

2 Answers 2

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So I solved the issue, but I still don't know what caused it. I selected the whole mesh, and deleted loose. That gave me a face with 6 vertices. Creating an edge by selecting the two middle vertices and pressing f recreated the issue; However, using the knife tool to cut the new face solved the issue. I somebody knows what this means, please let me know. Thanks.

Improve this answer
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  • $\begingroup$ if you want to know what cause it, please share your blend file with problematic part via blend-exchange.giantcowfilms.com as moonbots asked. thank you :) $\endgroup$
    – vklidu
    Commented Feb 26, 2020 at 19:16
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In cases like these it always comes back to some type of bad topology: overlapping, non-manifod etc. Do a mesh cleanup. Alternatively delete the problem area and grid-fill it back.

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