preview render artifacts 2.72-2.73 #43158
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Reference: blender/blender#43158
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System Information 1
CPU: Intel i3-3220 3.3Ghz
GPU: EVGA GTX 570 1280 MB (Driver 344.11)
RAM: 12 GB
OS: Windows 7 Home Premium 64bit
System Information 2
Lenovo Y410P
CPU: Intel i7-4700MQ 2.40Ghz
GPU: Nvidia GT 755M and Intel HD 4600 (Driver 327.62)
RAM: 8 GB
OS: Windows 7 Home Premium 64bit
Blender Version
Broken: 2.72 and 2.73
Worked: 2.71
(http://download.blender.org/release/)
Description
Visible horizontal and vertical "tear" lines in preview render, both cycles and blender internal. Extra thick border on right and top sides of render seem to be related. Black lines on top and right also seen in fullscreen(alt-F10) in 2.73
Exact steps for others to reproduce the error
thicker border on right and top compared to 2.71
the tear lines about an eighth from the top and right sides
Figure 1- Proper UI and no artifacts in 2.71
Figure 2a- Original lossless capture showing bug in 2.72
Figure 2b- Marked to show artifacts. Gray line shows the tear line placement
Figure 3a- Original lossless capture showing bug in 2.73
Figure 3b- Marked to show artifacts. Gray line shows the tear line placement
Changed status to: 'Open'
Added subscriber: @Daedalus_MDW
Added subscriber: @Psy-Fi
A file please?
the default startup file shows the issue. a fresh install of blender, and change the viewport to rendered. but if you have to have a file ill get my cycles startup i use.
starter.blend startup file (sun script within is not my own)
Added subscribers: @Sergey, @ThomasDinges, @JulianEisel
Can confirm that on Win7 using the default cube (didn't test with Linux yet). It's really subtle, but it's both there, the thick border and the render artifacts. @Psy-Fi, mind looking into that? At least the border thing seems to be an OGL issue at the first glance. @Sergey and @ThomasDinges, maybe you can have a look as well?
Images are drawing by tiles in blender, so my guess it's the same issue as #42042 (rounding issue of tile coordinates).
The issue is caused by
1b94b3d, which changed the way howED_region_pixelspaceworks. Basically it now adds extra 1 to width/height. It used to beBLI_rcti_size_x(&ar->winrct) + 1and now it'sat->winx + 1(note:ar->winx = BLI_rcti_size_x(&ar->winrct) + 1).While this is a simple change (something like http://www.pasteall.org/56232/diff) there are comments in other places which courses +1 in
ED_region_pixelspaceand uses different functions. Worth investigating all that.Will let the author of that change to do further investigation :)
File used for testing: starter.blend (same as originally attached, but with the cube)
This issue was referenced by
a86482f81cChanged status from 'Open' to: 'Resolved'
Closed by commit
a86482f81c.