transparent shwadows don't render correctly in OpenCL with GCN #45054

New Issue

mathieu menuet · 2015-06-12T20:40:54+02:00

mathieu menuet commented

2015-06-12 20:40:54 +02:00

System Information
WIn7 x64, HD7770

Blender Version
Broken: 2.75 087c82e
Worked: 2.74 (no transparent shadows but also no glitches)

Short description of error
Rendering a scene with transparent materials doesn't work properly in OpenCL (on HD 7770 at least)

Exact steps for others to reproduce the error
Open Attached file and hit F12 on a machine with a GCN Card.
bug openCL transparent shadows.blend

The right render with CPU with 2.74 e1b8ed8

GPU render with 2.74 e1b8ed8 transparent shadows activated manually in kernel_types.h
The shadows on the left side are brighter than with CPU and one part is much darker.

GPU render with 2.75 087c82e transparent shadows activated in kernel_types.h

GPU render with 2.75 087c82e no transparent shadows

Note that the last 2 renders were made with x32 version because the buildbots for Winx64 are down. Notice the pink at the top and the noise at the bottom.

**System Information** WIn7 x64, HD7770 **Blender Version** Broken: 2.75 087c82e Worked: 2.74 (no transparent shadows but also no glitches) **Short description of error** Rendering a scene with transparent materials doesn't work properly in OpenCL (on HD 7770 at least) **Exact steps for others to reproduce the error** Open Attached file and hit F12 on a machine with a GCN Card. [bug openCL transparent shadows.blend](https://archive.blender.org/developer/F190460/bug_openCL_transparent_shadows.blend) ![cpu.png](https://archive.blender.org/developer/F190461/cpu.png) The right render with CPU with 2.74 e1b8ed8 ![gpu.png](https://archive.blender.org/developer/F190462/gpu.png) GPU render with 2.74 e1b8ed8 transparent shadows activated manually in kernel_types.h The shadows on the left side are brighter than with CPU and one part is much darker. ![gpu 2.75 087c82e with transparent shadows.png](https://archive.blender.org/developer/F190463/gpu_2.75_087c82e_with_transparent_shadows.png) GPU render with 2.75 087c82e transparent shadows activated in kernel_types.h ![gpu 2.75 087c82e.png](https://archive.blender.org/developer/F190464/gpu_2.75_087c82e.png) GPU render with 2.75 087c82e no transparent shadows Note that the last 2 renders were made with x32 version because the buildbots for Winx64 are down. Notice the pink at the top and the noise at the bottom.

mathieu menuet commented

2015-06-12 20:40:54 +02:00

Changed status to: 'Open'

mathieu menuet commented

2015-06-12 20:40:54 +02:00

Added subscriber: @bliblubli

mathieu menuet commented

2015-06-12 20:41:37 +02:00

Oh sorry, driver catalyst 15.4 beta

Bastien Montagne commented

2015-06-13 06:51:58 +02:00

Added subscriber: @mont29

Sergey Sharybin was assigned by Bastien Montagne

2015-06-13 06:52:35 +02:00

Bastien Montagne commented

2015-06-13 06:52:35 +02:00

Added subscribers: @ThomasDinges, @MartijnBerger

Sergey Sharybin commented

2015-06-13 12:37:22 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-06-13 12:37:22 +02:00

Sergey Sharybin commented

2015-06-13 12:37:22 +02:00

Transparent shadows are disabled in official builds for a reason -- issues with them are caused by bug in AMD compiler. There seems to be no issues on Tonga GPU machine here in the studio so i enabled transparent shadows in experimental kernel feature set. But it does not mean it became officially supported on all the platforms.

In order to make this feature official we need AMD to fix their compiler.

Transparent shadows are disabled in official builds for a reason -- issues with them are caused by bug in AMD compiler. There seems to be no issues on Tonga GPU machine here in the studio so i enabled transparent shadows in experimental kernel feature set. But it does not mean it became officially supported on all the platforms. In order to make this feature official we need AMD to fix their compiler.

mathieu menuet commented

2015-06-13 17:09:27 +02:00

and the pink in 2.75 that wasn't there in 2.74 (even without transparent shadows ?)

Sergey Sharybin commented

2015-06-13 17:53:55 +02:00

If the pink stuff happens with the 2.75-RC1 then it is to be reported separately, so it does not getting mixed with issues caused by your local modifications.

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transparent shwadows don't render correctly in OpenCL with GCN #45054