Uv border edges always smooth - option for only smooth internal #42293

New Issue

Daniel Bystedt · 2014-10-19T01:39:30+02:00

Daniel Bystedt commented

2014-10-19 01:39:30 +02:00

System Information intel i7-3770 CPU @3.40 Ghz
Operating system and graphics card
Windows 7 64 bit, nvidia GeForce GTX 660

Blender Version
Broken: (example: 2.69.7 4b206af, see splash screen) 7.2a
Worked: (optional)NONE

Short description of error
When using a subdivision modifyer or subdividing a model, blender always smoothes border edges of uv. Other 3d application keeps border edges non smoothed and smoothes only the internal uv's of the uv island. After I've painted a texture in blender with the subdivision modifier on and then use that texture in maya, I can see areas that are not painted at the border edges

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps

create a cube
uv unwrap it
add a subdivision surface modifier
apply a new texture paint slot and paint it at subdivision 3
go back to lowest subdivision.
observe the texture at the ub border edges. There are new areas visible that does not hae any paint applied to them
uvBorderSMoothBug.blend

**System Information** intel i7-3770 CPU @3.40 Ghz Operating system and graphics card Windows 7 64 bit, nvidia GeForce GTX 660 **Blender Version** Broken: (example: 2.69.7 4b206af, see splash screen) 7.2a Worked: (optional)NONE **Short description of error** When using a subdivision modifyer or subdividing a model, blender always smoothes border edges of uv. Other 3d application keeps border edges non smoothed and smoothes only the internal uv's of the uv island. After I've painted a texture in blender with the subdivision modifier on and then use that texture in maya, I can see areas that are not painted at the border edges **Exact steps for others to reproduce the error** Based on a (as simple as possible) attached .blend file with minimum amount of steps - create a cube - uv unwrap it - add a subdivision surface modifier - apply a new texture paint slot and paint it at subdivision 3 - go back to lowest subdivision. - observe the texture at the ub border edges. There are new areas visible that does not hae any paint applied to them [uvBorderSMoothBug.blend](https://archive.blender.org/developer/F118278/uvBorderSMoothBug.blend)

Daniel Bystedt commented

2014-10-19 01:39:30 +02:00

Changed status to: 'Open'

Daniel Bystedt commented

2014-10-19 01:39:30 +02:00

Added subscriber: @DanielBystedt

Campbell Barton commented

2014-10-20 10:53:31 +02:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2014-10-20 10:53:31 +02:00

Campbell Barton self-assigned this 2014-10-20 10:53:31 +02:00

Campbell Barton commented

2014-10-20 10:53:31 +02:00

This is intended, If you want to use the UV's at a lower resolution, disable UV smoothing in the SubSurf modifier.

Daniel Bystedt commented

2014-10-20 18:43:41 +02:00

Changed status from 'Archived' to: 'Open'

Daniel Bystedt reopened this issue

2014-10-20 18:43:41 +02:00

Daniel Bystedt commented

2014-10-20 18:43:41 +02:00

Hi there Campbell,

Thank you for the fast reply. I'm sorry if I was unclear in my description.

What I'm looking for is to be able to subdivide and smooth all uv's except those at the border of the uv's islands .

The reason for doing so is to be able to paint textures and lookdev in blender. As of this moment I am not able to use the textures I paint in blender within our production pipeline, since the uv's borders are smoothing. I think blender is a great application and it would be a shame not to use it.

Please let me know if you need any further explanation regarding this

Cheers
Daniel Bystedt
dbystedt.wordpress.com

Milford Film & Animation
milford.se

Hi there Campbell, Thank you for the fast reply. I'm sorry if I was unclear in my description. What I'm looking for is to be able to subdivide and smooth all uv's except those at the border of the uv's islands . The reason for doing so is to be able to paint textures and lookdev in blender. As of this moment I am not able to use the textures I paint in blender within our production pipeline, since the uv's borders are smoothing. I think blender is a great application and it would be a shame not to use it. Please let me know if you need any further explanation regarding this Cheers Daniel Bystedt dbystedt.wordpress.com Milford Film & Animation milford.se

Campbell Barton commented

2014-10-21 10:39:15 +02:00

Added subscriber: @Sergey

Campbell Barton commented

2014-10-21 10:39:15 +02:00

Hi Daniel, I can see this could be useful in some cases,

However Blender just doesn't support this, the bug tracker is to report software errors,
this is more of a feature request, which is outside the scope of the tracker.

I checked on supporting this but with the current subsurf code it doesn't work well.

OpenSubdiv integration is in development and according to @Sergey it can support this.

Setting TODO.

Hi Daniel, I can see this could be useful in some cases, However Blender just doesn't support this, the bug tracker is to report **software errors**, this is more of a feature request, which is outside the scope of the tracker. I checked on supporting this but with the current subsurf code it doesn't work well. OpenSubdiv integration is in development and according to @Sergey it can support this. Setting TODO.

Campbell Barton commented

2014-10-21 12:25:21 +02:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2014-10-21 12:25:21 +02:00

Daniel Bystedt commented

2014-10-21 18:33:41 +02:00

Thank you for the answer. I'm really impressed by your feedback speed and transparency of the bug tracker.

Keep on doing your fantastic work.

Cheers,
Daniel

Thank you for the answer. I'm really impressed by your feedback speed and transparency of the bug tracker. Keep on doing your fantastic work. Cheers, Daniel

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Uv border edges always smooth - option for only smooth internal #42293