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recently I've wanted to test out the Texture Paint Mode on Blender with some simple model (low poly stuff). I've been able to correctly (I assume) UV unwrap -manually and smart unwrap- my model to prepare it for texture painting. However when actually painting the model I've noticed some issues, whether trying to paint with a brush tool or the fill tool, some very small areas of faces of the model, whether having Face Selection Masking enabled or not, could not be painted:

I'm currently trying to paint on a 512x512 texture (don't know if the size matter) but, when trying to solve this problem, even with a resolution of 4096x4096 this problem still occurs, although it is less visible. I've also tried to mess around with the Bleed value by increasing it a little bit (from 2px-4px to 8px), and when I did that I noticed something else:

It seems that the "paint" is being applied with some rotation to it, and I don't think this is the expect result, so this might be the source of my problem.

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  • $\begingroup$ So I've tried something different to find the source of this problem. I've downloaded the 2.76 and the 2.73. I performed the same steps to recreate the exact scenario on both versions. On the 2.76 version the problem was still there, the painting was done with a slight rotation (just like on the second image), however on the 2.73 version everything was correct. The faces were painted fully and then the bleed was also applied correctly. Was this an existing problem? Am I the only one complaining about this, or things have to be done differently now? $\endgroup$
    – mobileDev07
    Apr 19, 2017 at 2:14

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Indeed it seems there's been a regression since 2.76. I reported it here https://developer.blender.org/T52453

Meanwhile, here's how the bleeding algorithm works on triangles :

this explains the non parallelism between the UV edge and the bleeding edge

since the regression, the bleeding treats a quad as 2 triangles.

In any case, most of the times, the best method is to not use bleeding, but paint on a transparent image, export it, import it in the compositor and feed it through an Inpaint node. This gives an even thickness and prevents bleeding in other islands or inside the same island.

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