Backfacing transparency appears black in GPU (OpenCL) rendering - Cycles #57841
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Reference: blender/blender#57841
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System Information
System 1:
CPU: Ryzen 5 2600
GPU: RX 570 4GB
OS: Windows 10 Home
System 2:
CPU: Ryzen 5 2500U
GPU: Vega 8
OS: Windows 10 Home
Blender Version
Broken:
Blender 2.79b
Blender 2.79 Master
d7f55c4ff5(November 15)Blender 2.8
c94f806dc7(November 15)Short description of error
If an object material has the "Backfacing" output of the "Geometry" node plugged into a mix node in a way that the back face is transparent, that back face will appear black in the final render on the GPU (only tested with OpenCL). Viewport rendering is unaffected.
Here's an example of what I mean:
Node tree:
CPU Render/Expected result:
GPU Render:
Exact steps for others to reproduce the error
Here's a few Blend files to test with:
2.79b and Master:
2.79 Backfacing Test.blend
2.8:
2.8 Backfacing Test.blend
Added subscriber: @Alaska
Added subscriber: @lichtwerk
Cannot reproduce (but am on linux with 970m).
Which driver version is this? (Have you tried other driver versions?)
The Vega 8 GPU is running driver version 17.7
The RX 570 is running diver version 18.10.2
I'm unable to try different drivers on the Vega 8 due to how AMD has setup it's distribution, but I'll give the RX 570 a try on different drivers once my current render is finished.
Added subscriber: @ChristopherAnderssarian
I get the reported result with my Vega 64.
Driver ver. 18.10.1
@ChristopherAnderssarian
Are you also able to test this bug? https://developer.blender.org/T57645
Added subscriber: @KrzysztofSochacki
I have the same problem
ubuntu 18.04
amd pro driver 18.50
amd Fx 8150 + RX 580
when I use "life render" on GPU it works fine
when press f12 it goes black both sides (I use plane, not cube)
edit
I've installed win 10 on the same computer with newest amd gpu driver and results are the same :/
Added subscriber: @vistula_waves
This comment was removed by @vistula_waves
Added subscriber: @brecht
Added subscriber: @mano-wii
Changed status from 'Confirmed' to: 'Needs User Info'
I can't reproduce the problem.
The CPU and GPU results are the same.
Operating system: Windows-10-10.0.18941 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.13559 Core Profile Context 26.20.12028.2
Can try the latest daily build? https://builder.blender.org/download/
It's working for me.
Operating system: Windows 7
GPU: Radeon Vega 64, Divider version: 19.12.2
CPU: Intel Core i7-5960X
Changed status from 'Needs User Info' to: 'Resolved'
Marking as
Resolvedthen.The report can be reopened if the problem persists.
Added subscriber: @ankitm
@mano-wii https://developer.blender.org/T73471 related? possibly duplicate. They fixed it by uninstalling and reinstalling the driver related stuff.
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Quadro NVS 290/PCIe/SSE2 NVIDIA Corporation 3.3.0
Broken: version: 2.82 (sub 6),