Subsurf UV is not working (correctly) #48110

New Issue

Andy Goralczyk · 2016-04-11T12:33:59+02:00

Andy Goralczyk commented

2016-04-11 12:33:59 +02:00

Blender Version
Broken: since 2.75
Worked: 2.74

Subsurf UV does not seem to work. I checked this file creature.blend from the blender cloud; in the latest blender and there is a visible seam in the center. the seam is not present in 2.73. subsurf UV used to fix that seam.

Exact steps for others to reproduce the error
Open the attached file, enter textured mode or render viewport to preview the texture.
See screenshot:

For comparison, this is 2.74:

**Blender Version** Broken: since 2.75 Worked: 2.74 Subsurf UV does not seem to work. I checked this file [creature.blend](https://archive.blender.org/developer/F302133/creature.blend) from the blender cloud; in the latest blender and there is a visible seam in the center. the seam is not present in 2.73. subsurf UV used to fix that seam. **Exact steps for others to reproduce the error** Open the attached file, enter textured mode or render viewport to preview the texture. See screenshot: ![Screenshot - 11-04-16 - 12:31:26.png](https://archive.blender.org/developer/F302138/Screenshot_-_11-04-16_-_12_31_26.png) For comparison, this is 2.74: ![Screenshot - 11-04-16 - 12:32:28.png](https://archive.blender.org/developer/F302140/Screenshot_-_11-04-16_-_12_32_28.png)

Andy Goralczyk commented

2016-04-11 12:33:59 +02:00

Changed status to: 'Open'

Andy Goralczyk commented

2016-04-11 12:33:59 +02:00

Added subscriber: @eyecandy

Campbell Barton commented

2016-04-11 12:52:00 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2016-04-11 12:52:00 +02:00

This was an intentional change where overlapping UV's (which are commonly used with mirrored meshed) used to contract when subsurf UV's were enabled.

This meant that duplicating and flipping a mesh would give different UV's to having only a single side.

So a change was committed to treat edges along these ares as seams.

This was an intentional change, caused by: #44530

Also, if you check the UV coords, they contract noticeably from the UV boundaries

... this is an example of how the previous behavior was problematic, that mirroring geometry would noticeably change the sub-surfed coords.

Think this report can be closed as intended change in behavior.

This was an intentional change where overlapping UV's (which are commonly used with mirrored meshed) used to contract when subsurf UV's were enabled. This meant that duplicating and flipping a mesh would give different UV's to having only a single side. So a change was committed to treat edges along these ares as seams. This was an intentional change, caused by: #44530 Also, if you check the UV coords, they contract noticeably from the UV boundaries ![creature.png](https://archive.blender.org/developer/F302148/creature.png) ... this is an example of how the previous behavior was problematic, that mirroring geometry would noticeably change the sub-surfed coords. Think this report can be closed as intended change in behavior.

Campbell Barton commented

2016-04-11 13:10:48 +02:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2016-04-11 13:10:48 +02:00

Campbell Barton self-assigned this 2016-04-11 13:10:48 +02:00

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Subsurf UV is not working (correctly) #48110