Regression for brush bleed with quads #52453

New Issue

ChameleonScales · 2017-08-19T16:29:43+02:00

ChameleonScales commented

2017-08-19 16:29:43 +02:00

System Information
Linux Manjaro 64-bit
GeForce GT 640

Blender Version
Broken: 2.79 RC1 down to 2.76
Worked: 2.75a and previous versions

Short description of error

Up until 2.75a, the texture brush bleed performed on quads using the bisectors of the quads :

but since 2.76 up until 2.79 RC1, it performs on the triangles that compose the quads :

this brought undesirable results such as an uneven thickness of the bleeding :

increasing the bleed value is not a good way to counteract this problem since it increases the chances of bleeding into another UV island or bleeding inside the very island we're painting in, as shown by the white arrows here (a texture stencil was used in the brush to make it visible everywhere) :

Exact steps for others to reproduce the error

in 2.75a open this file bleeding regression.blend and click on the cube to fill it with paint with the fill brush
observe the image
do the same in any later version

**System Information** Linux Manjaro 64-bit GeForce GT 640 **Blender Version** Broken: 2.79 RC1 down to 2.76 Worked: 2.75a and previous versions **Short description of error** Up until 2.75a, the texture brush bleed performed on quads using the bisectors of the quads : ![2.75a quad.png](https://archive.blender.org/developer/F718634/2.75a_quad.png) but since 2.76 up until 2.79 RC1, it performs on the triangles that compose the quads : ![2.76 quad.png](https://archive.blender.org/developer/F718636/2.76_quad.png) this brought undesirable results such as an uneven thickness of the bleeding : ![quad grid comparison.png](https://archive.blender.org/developer/F718638/quad_grid_comparison.png) increasing the bleed value is not a good way to counteract this problem since it increases the chances of bleeding into another UV island or bleeding inside the very island we're painting in, as shown by the white arrows here (a texture stencil was used in the brush to make it visible everywhere) : ![2.76 quad grid 2.png](https://archive.blender.org/developer/F718640/2.76_quad_grid_2.png) **Exact steps for others to reproduce the error** - in 2.75a open this file [bleeding regression.blend](https://archive.blender.org/developer/F718547/bleeding_regression.blend) and click on the cube to fill it with paint with the fill brush - observe the image - do the same in any later version

ChameleonScales commented

2017-08-19 16:29:43 +02:00

Changed status to: 'Open'

ChameleonScales commented

2017-08-19 16:29:43 +02:00

Added subscriber: @ChameleonScales

ChameleonScales changed title from ~~Regression between 2.75a and 2.76 onwards for brush bleed with quads~~ to Regression since 2.76 onwards for brush bleed with quads

2017-08-19 16:30:38 +02:00

Ryan Pocock commented

2017-08-19 16:35:45 +02:00

Added subscriber: @autumnpioneer

ChameleonScales changed title from ~~Regression since 2.76 onwards for brush bleed with quads~~ to Regression for brush bleed with quads

2017-08-19 16:49:52 +02:00

Brecht Van Lommel commented

2017-08-19 17:21:09 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-08-19 17:21:09 +02:00

Why not add this information to #50831? It looks like exactly the same issue as reported there.

ChameleonScales commented

2017-08-19 18:11:33 +02:00

Note that even the non-regressed version doesn't completely fix the issues mentioned in the other task in terms of parallelism between the UV edge and the bled edge. If the quad is distorted, you lose that parallelism :

and there can still be some issues like bleeding inside the island and uneven thickness on some meshes :

the other task is more of a request for a better bleeding method all in all, whereas this task is specific to bringing back at least the quad support.

Note that even the non-regressed version doesn't completely fix the issues mentioned in the other task in terms of parallelism between the UV edge and the bled edge. If the quad is distorted, you lose that parallelism : ![distorted quad.png](https://archive.blender.org/developer/F718625/distorted_quad.png) and there can still be some issues like bleeding inside the island and uneven thickness on some meshes : ![curvy quad mesh.png](https://archive.blender.org/developer/F718627/curvy_quad_mesh.png) the other task is more of a request for a better bleeding method all in all, whereas this task is specific to bringing back at least the quad support.

Bastien Montagne commented

2017-08-19 18:31:14 +02:00

Closed as duplicate of #50831

Bastien Montagne closed this issue

2017-08-19 18:31:14 +02:00

ChameleonScales commented

2017-08-19 19:15:17 +02:00

Closing the other one and keeping this one would make more sense to me, as the other one doesn't qualify as a valid bug report (more as a feature request), whereas this one does, as I explained in my previous commentary, but I'll leave it to you from here.

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Regression for brush bleed with quads #52453