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Whenever I make this simple shape with a plane and unwrap it, it unwraps into a weird shape:

enter image description here

I know I can unwrap with project from view or cube projection to get the correct shape so I'm not after a solution per se, I'm looking for an explanation about what's the cause and why it happens as well as it it's a bug or not. from what I've tested it happens whenever there's a long rectangle attached to another one, as the shape get bigger and become longer the uv start to twist in weird shapes,

  • I did apply the scale and it's not the issue here.
  • The corners are exactly 90 degrees
  • the scales are 20cm*280cm with 2cm extra width on each side at the base for 10cm if you want to make that exact shape

Edit: as you can see, a shorter version unwraps correctly as well as the one I changed some of those 90 degrees angles:

enter image description here

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You are trying to unwrap an n-gon. Fill in the missing edges, and the unwrap will look as expected.

enter image description here

After that, you can delete the three edges using "limited dissolve", if you want to keep working with an n-gon. The UVs will stay the same.

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  • $\begingroup$ well it's not because it's an n-gon, there should be another reason. $\endgroup$ – Kia Azad Dec 5 '17 at 17:38
  • $\begingroup$ That some n-gons seem to be working, is no reason to say "there should be another reason". I just can answer your question, whether you try to acknowledge this and start working with proper topology is completely up to you. $\endgroup$ – yann Dec 5 '17 at 18:27
  • $\begingroup$ my question wasn't about proper topology, it's about why does this problem in unwrapping happens, and I know the answer is not "because its an n-gon" $\endgroup$ – Kia Azad Dec 5 '17 at 23:04

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