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This fret board has the seam in the right position, but the uv is stretching. The upper part should be the same as the part that is not stretching, and this is happening with other parts of my mesh as well. I even move the vertices in the same position (uv vertices) as the lower part and was not stretching. Any idea how to solve the problem?

Overall the uv is really deformed, the right and left have a bit of stretch as well enter image description here

enter image description here

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I don't know exactly but I have some ideas. I tried to recreate the problem and couldn't, but I created other problems and here's how I fixed them.

  1. If I have a non-manifold mesh (meaning the bottom of the fretboard doesn't have a face, just the top and sides) and I unwrapped, it would unwrap the mesh into 2 pieces... even though I just added edge seams in the same places you did, along the 4 curved "short" edges. And, I got stretching for no reason. https://i.stack.imgur.com/wuRWr.jpg

  2. Just as a guess I tried recalculate normals, and it shows the stretching is worse?? https://i.stack.imgur.com/hgKKU.jpg

  3. So I decided maybe the missing face is the problem. I added a face to the bottom, and added edge seams to 3 out of 4 edges so that everything would stay attached in the UV editor as 1 piece. The stretching is gone, but it's still two pieces, wtf? https://i.stack.imgur.com/zdLX4.jpg

  4. Next I figured the problem must be the seams, so I cleared them and carefully added them again in the same places. Almost correct, but 1 small piece is still detached, and it does NOT have seams on all 4 sides. ... hrm. https://i.stack.imgur.com/EPA9R.jpg

  5. Finally, I figure out there's an extra vertex somewhere that I didn't want. I did mesh - clean up - remove doubles. This removed the 1 vertex. When I unwrapped again, it's perfect. https://i.stack.imgur.com/9guZQ.jpg

I think a hidden extra vertex can create this stretch problem... the mesh is attached to it, but you don't see it, because it overlaps some other vertex that it separated from without problems, due to the edge seams you created.

So my advice is... make sure the mesh doesn't have missing faces. Clean up any extra points or edges or doubles. Recalculate normals. Confirm cuts are in the correct place, then unwrap again. Hopefully one of those ideas fixes it.

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