Shadow disappears when you turn on Volume absorption in OpenCl Rx 5700 #76628

New Issue

Jason · 2020-05-11T06:14:22+02:00

Jason commented

2020-05-11 06:14:22 +02:00

System Information
Operating system: Windows 10 64 bit ver 1909 build 18363.778
Graphics card: Rx5700
Driver Version: 19.50.29.27-200421a-354308E-RadeonSoftwareAdrenalin2020 (20.4.2)

Blender Version
Broken: 2.82a

Short description of error

When rendering with a material with a transmission of 1 and volumetric absorption turned on in GPU Render (Open Cl) the shadow for said object/material does not render. Shadow renders fine with CPU render on, or volume absorption off / removed.

Exact steps for others to reproduce the error

Open blender and set render to open cl / GPU compute

Volumetrics absorption on+ transmission to 1 on your material

Settings of Volumetric absorption do not matter just that it is present / turned on

Render object with material

test.blend

blender_debug_output.txt

blender_system_info.txt
Done with open cl with 5700 on fresh windows install

same as above but with CPU render instead of GPU / openCl render

GPU/ OpenCl render with no volumetric absorption

**System Information** Operating system: Windows 10 64 bit ver 1909 build 18363.778 Graphics card: Rx5700 Driver Version: 19.50.29.27-200421a-354308E-RadeonSoftwareAdrenalin2020 (20.4.2) **Blender Version** Broken: 2.82a **Short description of error** When rendering with a material with a transmission of 1 and volumetric absorption turned on in GPU Render (Open Cl) the shadow for said object/material does not render. Shadow renders fine with CPU render on, or volume absorption off / removed. **Exact steps for others to reproduce the error** Open blender and set render to open cl / GPU compute Volumetrics absorption on+ transmission to 1 on your material Settings of Volumetric absorption do not matter just that it is present / turned on Render object with material [test.blend](https://archive.blender.org/developer/F8527205/test.blend) [blender_debug_output.txt](https://archive.blender.org/developer/F8527206/blender_debug_output.txt) [blender_system_info.txt](https://archive.blender.org/developer/F8527207/blender_system_info.txt) Done with open cl with 5700 on fresh windows install ![untitled.png](https://archive.blender.org/developer/F8527208/untitled.png) same as above but with CPU render instead of GPU / openCl render ![cpu.png](https://archive.blender.org/developer/F8527211/cpu.png) GPU/ OpenCl render with no volumetric absorption ![no volume.png](https://archive.blender.org/developer/F8527214/no_volume.png)

Jason commented

2020-05-11 06:14:22 +02:00

Added subscriber: @jvb50m

Jason changed title from ~~Shadow disappears when you turn on Volume absorption in OpenCl~~ to Shadow disappears when you turn on Volume absorption in OpenCl Rx 5700

2020-05-11 06:21:56 +02:00

Richard Antalik commented

2020-05-12 14:49:07 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-05-12 14:49:07 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Richard Antalik commented

2020-05-12 14:49:07 +02:00

Doesn't happen on
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon RX550/550 Series ATI Technologies Inc. 4.5.13586 Core Profile Context 19.12.2 26.20.15002.61

There are quite ugly glitches though.
Worst case was below. but usually there are only lines through image and noise

Doesn't happen on Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Radeon RX550/550 Series ATI Technologies Inc. 4.5.13586 Core Profile Context 19.12.2 26.20.15002.61 There are quite ugly glitches though. Worst case was below. but usually there are only lines through image and noise ![untitled.jpg](https://archive.blender.org/developer/F8530654/untitled.jpg)

Jason commented

2020-05-12 16:47:24 +02:00

Ok after doing some more investigating I think it's only an issue with the 5700 series cards. I popped in my old r9 380x into my machine and with the same drivers rendered this.

This was done on the same machine, on the same fresh install with the same drivers.
blender_system_info.txt

blender_debug_output.txt

Ok after doing some more investigating I think it's only an issue with the 5700 series cards. I popped in my old r9 380x into my machine and with the same drivers rendered this. ![new gpu.png](https://archive.blender.org/developer/F8530878/new_gpu.png) This was done on the same machine, on the same fresh install with the same drivers. [blender_system_info.txt](https://archive.blender.org/developer/F8530891/blender_system_info.txt) [blender_debug_output.txt](https://archive.blender.org/developer/F8530892/blender_debug_output.txt)

Jason commented

2020-05-20 07:53:15 +02:00

#69916 seems very similar to this issue, but in 2.9.0.2 a, I still was not able to render a shadow.

[#69916 ](https://developer.blender.org/T69916) seems very similar to this issue, but in 2.9.0.2 a, I still was not able to render a shadow.

Richard Antalik commented

2020-11-26 20:48:06 +01:00

@jvb50m I am looking at older reports, is this still an issue? Or have anything changed?

Jason commented

2020-11-26 21:21:46 +01:00

Hey Richard, as of right now I'm unable to render with my GPU in blender, it just crashes whenever I try to use the GPU in cycles.

However last time I checked I fixed this by rolling back to a much older driver and I was able to get renders, but I was not able to get a shadow with volumetrics turned on, (this was one of the 2.90 versions.) However, I'm not able to check if the specific issue persists at the moment as that older driver now causes other issues with my computer so I'm unable to use it. But if i had to guess it is still an issue.

Sorry that I couldn't be more help, but blender seems to just not work on the RX5700 gpu

Hey Richard, as of right now I'm unable to render with my GPU in blender, it just crashes whenever I try to use the GPU in cycles. However last time I checked I fixed this by rolling back to a much older driver and I was able to get renders, but I was not able to get a shadow with volumetrics turned on, (this was one of the 2.90 versions.) However, I'm not able to check if the specific issue persists at the moment as that older driver now causes other issues with my computer so I'm unable to use it. But if i had to guess it is still an issue. Sorry that I couldn't be more help, but blender seems to just not work on the RX5700 gpu

Robert Guetzkow commented

2020-11-27 12:33:34 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2020-11-27 12:33:34 +01:00

There are quite a lot of people that report issues with the AMD Radeon RX 5700 XT (see #75319). This appears to be an issue with the AMD driver.

Thomas Dinges commented

2021-11-18 17:49:09 +01:00

Added subscriber: @ThomasDinges

Thomas Dinges commented

2021-11-18 17:49:09 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Resolved'

Thomas Dinges closed this issue

2021-11-18 17:49:09 +01:00

Thomas Dinges self-assigned this 2021-11-18 17:49:09 +01:00

Thomas Dinges commented

2021-11-18 17:49:09 +01:00

OpenCL rendering support was removed in Blender 3.0.
The combination of the limited Cycles kernel implementation, driver bugs, and stalled OpenCL standard
has made maintenance too difficult. Thanks for your report, but it's unlikely that there will be further fixes for OpenCL in 2.93 LTS.

For AMD GPUs, there is a new backend based on the HIP platform.
In Blender 3.0, this is supported on Windows with RDNA and RDNA2 generation discrete graphics cards.
It includes Radeon RX 5000 and RX 6000 series GPUs. Driver version Radeon Pro 21.Q4 or newer is required.
https://wiki.blender.org/wiki/Reference/Release_Notes/3.0/Cycles

Your scene works fine for me with the new HIP backend on an AMD 5500 XT. Therefore closing this report.

OpenCL rendering support was removed in Blender 3.0. The combination of the limited Cycles kernel implementation, driver bugs, and stalled OpenCL standard has made maintenance too difficult. Thanks for your report, but it's unlikely that there will be further fixes for OpenCL in 2.93 LTS. For AMD GPUs, there is a new backend based on the HIP platform. In Blender 3.0, this is supported on Windows with RDNA and RDNA2 generation discrete graphics cards. It includes Radeon RX 5000 and RX 6000 series GPUs. Driver version Radeon Pro 21.Q4 or newer is required. https://wiki.blender.org/wiki/Reference/Release_Notes/3.0/Cycles Your scene works fine for me with the new HIP backend on an AMD 5500 XT. Therefore closing this report.

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Shadow disappears when you turn on Volume absorption in OpenCl Rx 5700 #76628