AMD GPU + Cycles + Branched Path Tracing + Reflective Caustics = Render Tiles Bug #72864
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Reference: blender/blender#72864
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System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: Radeon RX 580 Series ATI Technologies Inc. 4.5.13586 Core Profile Context 19.12.2 26.20.15002.61
Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash:
f1aa4d18d4Worked: (optional)
Short description of error
AMD GPU + Cycles + Branched Path Tracing + Reflective Caustics = Render Tiles Bug
Exact steps for others to reproduce the error
*Unchecking Reflective Caustics will make error tiles disappear.
Tested on:
R9 380X - bug present
RX 480 - bug present
RX 580 - bug present
Firepro M6100 - bug present
GTX 960M - no bug
*all on Windows 10 64bit
AMD Drivers:
Adrenalin 19.10.1 to 19.12.2
Enterprise 19.Q4.1
cycles_cuda_opencl_test2.blend
Added subscriber: @rjnievera
#80700 was marked as duplicate of this issue
#70501 was marked as duplicate of this issue
Added subscriber: @JacquesLucke
Changed status from 'Needs Triage' to: 'Confirmed'
I can reproduce the artifacts on an AMD Radeon RX 5700 on Windows. However, the artifact pattern looks different to yours. Furthermore, when I render the image twice, I get exactly the same result. Do you get different results on different AMD GPUs?
Added subscriber: @mont29
This might actually be more like known limitation (afaik, AMD OpenCL is still lagging behind…), but let’s #Cycles team decide here.
Subsequent renders on the same scene/frame produces different artifact patterns. This was on an RX 480.
Added subscriber: @cr00k
I can confirm the same issue using Radeon VII and Threadripper 2950x in Windows 10, blender 2.82.7. AMD Radeon driver 19.10.1 and latest 20.4.1.
Workaround is to select only one OpenCL Render Device (Edit > Preferences > System). Either GPU or CPU. I found out that the final render is slightly different using only GPU (darker) or only CPU > hence, mixing both CPU and GPU results in tiles (every time different "tiling" result, due to slightly different sampling).
Hope it helps.
Here are some examples from the legendary donut tutorial :)
Only GPU
Only CPU
Both
Added subscribers: @ColeMorris, @brecht, @zaster, @atomedia, @AaronSmithey, @mano-wii
The issue here is that data allocated by
closure_alloc_extrais not being properly copied insplit/kernel_branched.h.This is rather tricky since this data contains pointers which would also need to be remapped, or removed so that we don't need to remap them.
Added subscriber: @BlackYps
Changed status from 'Confirmed' to: 'Archived'
OpenCL and branched path tracing were removed in Blender 3.0, the new unified CUDA/HIP kernels will not have this problem.