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As title said, after adding Subsurf modifier, some UV is disorted.

If mesh has simple geometry, I can fix it, but sometimes it's too complicated or can't fix it because it's getting worse.

This is the example model that I faced this problem:

enter image description here

Top image is low poly and lower image is high poly mesh that applied sub-surf modifier.

As you can see those red lined boxes, some UV is disorted and I can't fix it.

Is there a way to fix this problem?

Also I mostly prefer using Smart UV Project, because when I unwrap my mesh manually, each UV island has different ratio.

Is there a way to adjust ratio of UV islands automatically?

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    $\begingroup$ I just posted an answer to another post on the frontpage blender.stackexchange.com/questions/105644/… $\endgroup$ – kheetor Apr 11 '18 at 15:56
  • $\begingroup$ Also if you unwrap all the islands at the same time they will have the same ratio, but if the seams are unoptimal and you have significant distortion it's going to introduce texture stretching. $\endgroup$ – kheetor Apr 11 '18 at 15:59
  • $\begingroup$ Could you add creases? blender.stackexchange.com/questions/45859/… $\endgroup$ – moarorleslie Apr 11 '18 at 19:15
  • $\begingroup$ @moarorleslie Yes. drive.google.com/open?id=1yax_uUnSCuiVzdjJwsP52iFlQEm__YCm $\endgroup$ – modernator Apr 12 '18 at 3:48
  • $\begingroup$ I just figured out that UV distortion only happens when mesh transformed to different shape of original shape. I mean if there is sharp edge between the adjacent two edges and adding subsurf modifier inserts additional edges to make smoother and that's the point where distortion begins. I can fix my UV to change the edge crease for that line now, but this is not the answer. I also tried turning of "Subdivided UV" but it also doesn't work, it produce another UV distortions. $\endgroup$ – modernator Apr 12 '18 at 12:20
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Using subsurface modifier will not 100% guarantee that has perfect uv result. I already told in comment, however if you want to add more geometry after finish modeling, should be careful to not messing up the UV to watch carefully while adding additional geometry.

This especially messing up that adding more edges in curved geometry, so it's just better to remap your UV to new Geometry.

If you using Substance Painter for creating texture, don't be afraid, the program will automatically repaint all your previous works even the geometry and UV's are changed(but not 100%).

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