Texture Offset between Cycles CPU and GPU render #43795

New Issue

Hayes · 2015-02-24T18:02:30+01:00

Hayes commented

2015-02-24 18:02:30 +01:00

Windows 7 64 bit
CPU: AMD 8320-fx
GPU: Sapphire AMD R7 260x
Video Driver: Catalyst Omega 14.12

Blender Version: 2.73a (bbf09d9)

There is a 1~ pixel offset in textures rendered between CPU and GPU rendering.
First discovered when rendering the BMW test, I used a difference layer effect to see if the pixels were identical (checking for artifacts).
Only the lights and plate showed up as different, zooming into the head light and rendering both engines revealed a slight shift in texture.
Can be recreated with a test grid default cube:

Load default scene, Enable cycles (in this case cycles test environmental flag is set to all), Edit default cube, Create texture (without unwrap) 256x256 with Test Grid pattern, enable cycles preview, Zoom in on corner and switch between CPU and GPU rendering.

Texture_offset_Bug.blend

Windows 7 64 bit CPU: AMD 8320-fx GPU: Sapphire AMD R7 260x Video Driver: Catalyst Omega 14.12 Blender Version: 2.73a (bbf09d9) There is a 1~ pixel offset in textures rendered between CPU and GPU rendering. First discovered when rendering the BMW test, I used a difference layer effect to see if the pixels were identical (checking for artifacts). Only the lights and plate showed up as different, zooming into the head light and rendering both engines revealed a slight shift in texture. Can be recreated with a test grid default cube: ![UVCPUGPU.jpg](https://archive.blender.org/developer/F145674/UVCPUGPU.jpg) Load default scene, Enable cycles (in this case cycles test environmental flag is set to all), Edit default cube, Create texture (without unwrap) 256x256 with Test Grid pattern, enable cycles preview, Zoom in on corner and switch between CPU and GPU rendering. [Texture_offset_Bug.blend](https://archive.blender.org/developer/F145677/Texture_offset_Bug.blend)

Hayes commented

2015-02-24 18:02:30 +01:00

Changed status to: 'Open'

Hayes commented

2015-02-24 18:02:30 +01:00

Added subscriber: @SleepyMolecule

Hayes commented

2015-02-24 18:05:54 +01:00

Might be related to some users UV issues re baked textures.

ronan ducluzeau commented

2015-02-26 17:14:48 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2015-02-26 17:14:48 +01:00

blender hash 60679a1
I cannot reproduceweird offset. Texture_offset_Bug.blend gives same result for CPU and GPU, here.
The margin due to linear interpolation of texture can be removed by switching to closest interpolation.
But I have still same result between CPU and GPU.

blender hash 60679a1 I cannot reproduceweird offset. Texture_offset_Bug.blend gives same result for CPU and GPU, here. The margin due to linear interpolation of texture can be removed by switching to closest interpolation. But I have still same result between CPU and GPU.

Mike Pan commented

2015-02-27 01:14:44 +01:00

Added subscriber: @MikePan

Mike Pan commented

2015-02-27 01:14:44 +01:00

Cannot produce error either. Both render show the 1pixel border. GPU is a GTX970 running 347.09 Driver on Win7.

Sergey Sharybin commented

2015-02-27 08:33:32 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-02-27 08:33:32 +01:00

This is in fact the same exact issue as #43779, so will merge them now.

Sergey Sharybin commented

2015-02-27 08:33:42 +01:00

Closed as duplicate of #43779

Sergey Sharybin closed this issue

2015-02-27 08:33:42 +01:00

Hayes commented

2015-02-27 14:22:23 +01:00

In #43795#291778, @zeauro wrote:
blender hash 60679a1
I cannot reproduceweird offset. Texture_offset_Bug.blend gives same result for CPU and GPU, here.
The margin due to linear interpolation of texture can be removed by switching to closest interpolation.
But I have still same result between CPU and GPU.

Please post video card and CUDA / OpenCL, issue may be in either AMD kernel or OpenCL and I am unable to test that myself, thanks!

> In #43795#291778, @zeauro wrote: > blender hash 60679a1 > I cannot reproduceweird offset. Texture_offset_Bug.blend gives same result for CPU and GPU, here. > The margin due to linear interpolation of texture can be removed by switching to closest interpolation. > But I have still same result between CPU and GPU. Please post video card and CUDA / OpenCL, issue may be in either AMD kernel or OpenCL and I am unable to test that myself, thanks!

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Texture Offset between Cycles CPU and GPU render #43795