CPU and GPU produce different results #53452

New Issue

Steve Hargreaves · 2017-12-02T14:10:37+01:00

Steve Hargreaves commented

2017-12-02 14:10:37 +01:00

System Information
ArchLinux
NVidia GTX 680
CPU Phenom II X4 965

Blender Version
2.79

Short description of error

I was experimenting with the hybrid GPU/CPU rendering when I noticed this. Rendering on GPU produces a different tonal quality than rendering on CPU. Using the development hybrid renderer results in tiles rendered on CPU being noticably different than those rendered on the GPU. There are image samples at https://blenderartists.org/forum/showthread.php?439146-2-8-Branch-update-with-Cycles-CPU-GPGPU-rendering-together&p=3262986&viewfull=1#post3262986{F1263496}

Exact steps for others to reproduce the error
Render GPU in one slot, CPU in another, and switch to see the difference

**System Information** ArchLinux NVidia GTX 680 CPU Phenom II X4 965 **Blender Version** 2.79 **Short description of error** I was experimenting with the hybrid GPU/CPU rendering when I noticed this. Rendering on GPU produces a different tonal quality than rendering on CPU. Using the development hybrid renderer results in tiles rendered on CPU being noticably different than those rendered on the GPU. There are image samples at https://blenderartists.org/forum/showthread.php?439146-2-8-Branch-update-with-Cycles-CPU-GPGPU-rendering-together&p=3262986&viewfull=1#post3262986{F1263496} **Exact steps for others to reproduce the error** Render GPU in one slot, CPU in another, and switch to see the difference

Steve Hargreaves commented

2017-12-02 14:10:37 +01:00

Changed status to: 'Open'

Steve Hargreaves commented

2017-12-02 14:10:37 +01:00

Added subscriber: @Roken

YAFU commented

2017-12-02 16:09:09 +01:00

Added subscriber: @YAFU

YAFU commented

2017-12-02 16:09:09 +01:00

Thanks for report.
This is the problematic scene that Roken posted in other report:
poolproblem.blend

Thanks for report. This is the problematic scene that Roken posted in other report: [poolproblem.blend](https://archive.blender.org/developer/F1264577/poolproblem.blend)

Sergey Sharybin commented

2017-12-04 11:04:43 +01:00

Added subscriber: @Sergey

Sergey Sharybin self-assigned this 2017-12-04 11:04:43 +01:00

Sergey Sharybin commented

2017-12-04 11:04:44 +01:00

Can confirm the issue, didn't look into details yet. Needs investigation! Will have a look soon unless someone else from Cycles team steals this report :)

Sergey Sharybin commented

2017-12-13 16:47:05 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2017-12-13 16:47:05 +01:00

Sergey Sharybin commented

2017-12-13 16:47:05 +01:00

Actually, this bug should have been marked as resolved, unless there are other cases when there is a difference :)

YAFU commented

2017-12-14 01:42:10 +01:00

Same results now. Thank you Sergey!

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CPU and GPU produce different results #53452