Cycles blackbody shader-node doesn't look the same with CPU, OSL and GPU. #49253

New Issue

Miika Puustinen (miikap) · 2016-09-04T18:53:14+02:00

2016-09-04 18:53:14 +02:00

System Information
Windows 10 2xGTX960

Blender Version
Broken: 2.78RC1 0e5089c

Short description of error
Cycles blackbody shader-node doesn't look the same with CPU, OSL and GPU.
OSL and GPU have proper color range, but CPU without osl clamps values and makes weird pink color after that.

Exact steps for others to reproduce the error

Select default Cube and go to material nodes
Apply following nodes to the material Gradient Texture-->Multiply (5000)-->Blackbody-->Emission-->Material Output
Switch render engine between CPU, GPU and OSL

.blend:
http://pasteall.org/blend/index.php?id=43374

**System Information** Windows 10 2xGTX960 **Blender Version** Broken: 2.78RC1 0e5089c **Short description of error** Cycles blackbody shader-node doesn't look the same with CPU, OSL and GPU. OSL and GPU have proper color range, but CPU without osl clamps values and makes weird pink color after that. **Exact steps for others to reproduce the error** 1. Select default Cube and go to material nodes 2. Apply following nodes to the material Gradient Texture-->Multiply (5000)-->Blackbody-->Emission-->Material Output 3. Switch render engine between CPU, GPU and OSL .blend: http://pasteall.org/blend/index.php?id=43374

Miika Puustinen (miikap) commented

2016-09-04 18:53:14 +02:00

Changed status to: 'Open'

Miika Puustinen (miikap) commented

2016-09-04 18:53:14 +02:00

Added subscriber: @MiikaPuustinen

Sergey Sharybin commented

2016-09-05 15:39:28 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2016-09-05 15:39:28 +02:00

I can't reproduce the issue neither on Windows 10 nor on Linux Debian stable.

Does it happen for both viewport and final renders?

Can you try following:

Set debug value (shortcut is Ctrl-Alt-D) to 256.
This will enable some "secret" Debug panel in the Render settings.
See if disabling SSE/AVX options makes a difference on the error.
Please note that changing those options does not re-trigger viewport update, so you'll have to do it manually after tweaking any settings there.

I can't reproduce the issue neither on Windows 10 nor on Linux Debian stable. Does it happen for both viewport and final renders? Can you try following: - Set debug value (shortcut is `Ctrl-Alt-D`) to 256. - This will enable some "secret" Debug panel in the Render settings. - See if disabling SSE/AVX options makes a difference on the error. - Please note that changing those options does not re-trigger viewport update, so you'll have to do it manually after tweaking any settings there.

Miika Puustinen (miikap) commented

2016-09-06 09:24:00 +02:00

Final and preview renders.

Ok found which causes it. It's happening on win10 if AVX2 is on.

Here screenshots how the blackbody looks like when it's not working correctly:
http://pasteall.org/pic/index.php?id=106479

And correct one:
http://pasteall.org/pic/index.php?id=106478

Final and preview renders. Ok found which causes it. It's happening on win10 if AVX2 is on. Here screenshots how the blackbody looks like when it's not working correctly: http://pasteall.org/pic/index.php?id=106479 And correct one: http://pasteall.org/pic/index.php?id=106478

Sergey Sharybin was assigned by Aaron Carlisle

2017-02-02 16:53:29 +01:00

Sergey Sharybin commented

2017-02-03 16:40:46 +01:00

Doesn't happen on Linux..

Does it happen with latest builds from builder.blender.org? Does it happen with both msvc2013 and msvc2015 builds?

Doesn't happen on Linux.. Does it happen with latest builds from builder.blender.org? Does it happen with both msvc2013 and msvc2015 builds?

Ray molenkamp commented

2017-02-03 18:55:39 +01:00

Added subscriber: @LazyDodo

Ray molenkamp commented

2017-02-03 18:55:39 +01:00

Using latest buildbot builds ( 9f67367 ) it only happens to the AVX2 kernel

2013_x64 - Bad
2013_x86 - OK
2015 X64 - OK
2015 X86 - Cycles is broken due to codegen bug, can't test

Using latest buildbot builds ( 9f67367 ) it only happens to the AVX2 kernel 2013_x64 - Bad 2013_x86 - OK 2015 X64 - OK 2015 X86 - Cycles is broken due to codegen bug, can't test

blender-admin commented

2017-02-07 13:05:19 +01:00

This issue was referenced by blender/cycles@f0d80fd1ca

This issue was referenced by blender/cycles@f0d80fd1ca75adf471888da15347e19b9a86bf04

blender-admin commented

2017-02-07 13:05:19 +01:00

This issue was referenced by 53896d4235

This issue was referenced by 53896d4235d883f39d4b02119419c462ab65a3a7

Sergey Sharybin commented

2017-02-07 13:06:37 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2017-02-07 13:06:37 +01:00

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Cycles blackbody shader-node doesn't look the same with CPU, OSL and GPU. #49253