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Maniphest T41620

Bleed option in Texture Paint create artifacts while painting with bigger brushes.
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Description

System Information
Windows 7 64Bit / i7 2500K / GTX460

Blender Version
Broken: blender-2.71-6891f1c-win64 and various older versions (first tested on 2.63)

Description of error
While painting with big brush and Bleed option set to something other than 0 strange artifacts on edges adjacent to seams appear. I think blender have issues with detecting real mesh seams properly.

See on video below that painting on legs cause artifacts on armpit.

Exact steps for others to reproduce the error

Bleed_bug.blend4 MBDownload

Open blendfile and paint something on mesh with big brush.

Note that my mesh was imported from obj file and does not contains seam mark on edges but it also happen on meshes created in blender and with proper seam marks.

Revisions and Commits

rB Blender
rBd91916725d0d Fix T41620

Event Timeline

Bartosz Moniewski (monio) created this task.Aug 29 2014, 12:45 AM
Bartosz Moniewski (monio) assigned this task to Antonis Ryakiotakis (psy-fi).
Bartosz Moniewski (monio) raised the priority of this task from to 90.
Bartosz Moniewski (monio) updated the task description. (Show Details)
Bartosz Moniewski (monio) added projects: BF Blender, Sculpt, Paint & Texture.
Bartosz Moniewski (monio) edited a custom field.
Bartosz Moniewski (monio) added subscribers: Campbell Barton (campbellbarton), sergej (serg), Bastien Montagne (mont29).
Bartosz Moniewski (monio) added a subscriber: Bartosz Moniewski (monio).
Antonis Ryakiotakis (psy-fi) added a comment.Aug 29 2014, 12:49 AM

We have so many bug reports with seams that I really, really have to take a closer look into the system. Just changing numerical values for thresholds doesn't cut it anymore.

Bartosz Moniewski (monio) added a comment.Aug 29 2014, 1:09 AM

Great. :)

Bastien Montagne (mont29) lowered the priority of this task from 90 to Normal.Aug 29 2014, 10:46 AM
Przemyslaw Golab (SirPigeonz) (n-pigeon) added a subscriber: Przemyslaw Golab (SirPigeonz) (n-pigeon).Aug 30 2014, 12:37 PM
Antonis Ryakiotakis (psy-fi) changed the task status from Unknown Status to Resolved.Sep 1 2014, 12:36 PM
Antonis Ryakiotakis (psy-fi) added a commit: rBd91916725d0d: Fix T41620.

Closed by commit rBd91916725d0d.

Antonis Ryakiotakis (psy-fi) added a comment.Sep 1 2014, 12:37 PM

All, right I pushed a fix but there are still some seaming issues. One issue is that the seam bleed overlaps other islands.This will have to be taken care of by artists. The other issue is that the seam polygons intersect each other. To fix that without hurting performance too much we need bigger changes so I'll postpone for now. I hope this will make things better for now though already - still painting with this kind of gradients will show some artifacts at the seams still.