Very important bug in Texture Paint mode while painting object when faces are pointing ~90degrees away from the view/camera #43735

New Issue

Ghislain Girardot · 2015-02-19T13:42:54+01:00

Ghislain Girardot commented

2015-02-19 13:42:54 +01:00

System Information
Operating system and graphics card
Default Linux Mint 17.1 (also tested on different computers with different installs)
Nvidia GTX 580 TI
Also tried with a GTX 470 and 780 TI

Blender Version
Broken: Official 2.73a bbf09d9
Worked : previous to the recent work done on texture paint mode ?

Short description of error
Texture painting (no matter what brush you're using) produces huge artefacts on faces/triangles that are nearly pointing ~90 degrees away from the camera/view.
There are two kind of artefacts :

The most common is that the triangle/face [pointing 90 degrees away form the view] that you're painting on will not be entirely painted. Random surface/areas will be left unpainted.
If your UVs contains more than one UV island, 1 pixel width line will be drawn across the entire texture straight to 0,0UV coordinates !!

IMPORTANT : It depends on many factors so please give it a few tries. Me and my colleagues can reproduce the bug at will on many different PCs/hardware/distros ! It seems to depend on monitor resolution, fullscreen/windowed mode, 3d view window size, viewport angle and zoom AND perspective/orthographic mode.

The more you zoom in, the less chance artefacts will appears
A simple cube can reproduce the bug if you're in orthographic mode and if you align the view so its side faces are almost displayed as a straight line.
Sometimes the bug will appear more often in orthographic mode (or only in perspective), sometimes not. It's definitely random !

Finally, I'm pretty sure the bug started to appear only recently with the recent work on texture painting (the GSOC project I think ? I'm not sure.)

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

Open the blend file.
You should be in paint mode with the fill brush, so just click on the mesh to paint everything white.
You should see faces only partially painted and a huge amount of 1px width line drawn across the whole texture pointing towards 0,0UV coordinates

{F144634}

**System Information** Operating system and graphics card Default Linux Mint 17.1 (also tested on different computers with different installs) Nvidia GTX 580 TI Also tried with a GTX 470 and 780 TI **Blender Version** Broken: Official 2.73a bbf09d9 Worked : previous to the recent work done on texture paint mode ? **Short description of error** Texture painting (no matter what brush you're using) produces huge artefacts on faces/triangles that are nearly pointing ~90 degrees away from the camera/view. There are two kind of artefacts : 1) The most common is that the triangle/face [pointing 90 degrees away form the view] that you're painting on will not be entirely painted. Random surface/areas will be left unpainted. 2) If your UVs contains more than one UV island, 1 pixel width line will be drawn across the entire texture straight to 0,0UV coordinates !! IMPORTANT : It depends on many factors so please give it a few tries. Me and my colleagues can reproduce the bug at will on many different PCs/hardware/distros ! It seems to depend on monitor resolution, fullscreen/windowed mode, 3d view window size, viewport angle and zoom AND perspective/orthographic mode. - The more you zoom in, the less chance artefacts will appears - A simple cube can reproduce the bug if you're in orthographic mode and if you align the view so its side faces are almost displayed as a straight line. - Sometimes the bug will appear more often in orthographic mode (or only in perspective), sometimes not. It's definitely random ! Finally, I'm pretty sure the bug started to appear only recently with the recent work on texture painting (the GSOC project I think ? I'm not sure.) **Exact steps for others to reproduce the error** Based on a (as simple as possible) attached .blend file with minimum amount of steps 1) Open the blend file. 2) You should be in paint mode with the fill brush, so just click on the mesh to paint everything white. 3) You should see faces only partially painted and a huge amount of 1px width line drawn across the whole texture pointing towards 0,0UV coordinates {[F144634](https://archive.blender.org/developer/F144634/MyBug.blend)}![MyBug.jpg](https://archive.blender.org/developer/F144638/MyBug.jpg)

Ghislain Girardot commented

2015-02-19 13:42:54 +01:00

Changed status to: 'Open'

Ghislain Girardot commented

2015-02-19 13:42:54 +01:00

Added subscriber: @cremuss

Ghislain Girardot commented

2015-02-19 13:46:02 +01:00

Also, painting options doesn't seem to solve anything, no matter what occlusion/cull/normal/bleeding edges settings you set

Antonis Ryakiotakis commented

2015-02-19 14:22:06 +01:00

Changed status from 'Open' to: 'Resolved'

Antonis Ryakiotakis closed this issue

2015-02-19 14:22:06 +01:00

Antonis Ryakiotakis self-assigned this 2015-02-19 14:22:06 +01:00

Julian Eisel commented

2015-02-19 14:39:37 +01:00

Added subscriber: @JulianEisel

Julian Eisel commented

2015-02-19 14:39:37 +01:00

Just for people experiencing similar issues: We talked about this on IRC and as it seems, the drawing glitch from the UV islands seems to be gone in latest master.