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I have a simple model that is symmetrical on the Y axis. When I unwrap it, with the entire model selected the two identical sides do not share the same rotation:

Weird UV island rotation

If I de-select the middle UV island (the long band of quads) and unwrap, I get a more reasonable result:

Reasonable result

How come?

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  • $\begingroup$ Maybe that is the same problem as with subdivided (and long) meshes which for some reason tend to have stretched or unexpectedly rotated UV map, see blender.stackexchange.com/questions/35203/…. You can fix it by straightening and pinning one loop. This of course doesn't give the reason of behaviour. $\endgroup$ – Mr Zak Aug 28 '16 at 23:09
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I don't know if this will fix your problem, since you haven't indicated which unwrap method your using, but it's important to apply rotation and scale (Al;t-A) to the object before unwrapping.

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  • $\begingroup$ If OP used the Project from View method, this is why. The two sides are different relative to the view. $\endgroup$ – Mentalist Jun 4 '17 at 0:00
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If you check the T menu after unwrapping and change angle based to conformal and see if that makes a difference. Also try alt-a for adverage size and ctrl-p (i think) to pack islands.

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