Black render artifact with CPU+GPU rendering in viewport #53324

New Issue

Zsolt Stefan · 2017-11-15T11:00:57+01:00

Zsolt Stefan commented

2017-11-15 11:00:57 +01:00

System Information
Windows 7 Pro
Nvidia Quadro P6000
Intel Xeon E5-2690 v4

Blender Version
Broken: daily builds 2.79 since at least 25.10.2017.
Worked: -

Short description of error
If I enable combined CPU+GPU rendering, a black rectangle shows up on one of my objects. It shows up in viewport rendering, and also in the final render. This seems to be independent of the material used. I have provided a stripped down version of the scene where it is still visible. This time only in the viewport, the final render works for this simplified scene.

The artifact seems to be "locked in space", I can move or rotate the object away, so that it disappears. In some rotation angles it is not a black rectangle, but dense black lines.
What is also interesting is that the surface of the object in not only black, but partly transparent. I have put a lamp and a cube inside the object in the demo scene, these should not be visible from outside, but they are.

Exact steps for others to reproduce the error

Open file. In the render settings GPU compute should be turned on, and in the user preferences CUDA should have both the CPU and GPU selected.
Turn on viewport rendering. --> black box visible.
Then switch to CPU rendering. No more black box.

black_artifact_bug3.blend

**System Information** Windows 7 Pro Nvidia Quadro P6000 Intel Xeon E5-2690 v4 **Blender Version** Broken: daily builds 2.79 since at least 25.10.2017. Worked: - **Short description of error** If I enable combined CPU+GPU rendering, a black rectangle shows up on one of my objects. It shows up in viewport rendering, and also in the final render. This seems to be independent of the material used. I have provided a stripped down version of the scene where it is still visible. This time only in the viewport, the final render works for this simplified scene. The artifact seems to be "locked in space", I can move or rotate the object away, so that it disappears. In some rotation angles it is not a black rectangle, but dense black lines. What is also interesting is that the surface of the object in not only black, but partly transparent. I have put a lamp and a cube inside the object in the demo scene, these should not be visible from outside, but they are. **Exact steps for others to reproduce the error** - Open file. In the render settings GPU compute should be turned on, and in the user preferences CUDA should have both the CPU and GPU selected. - Turn on viewport rendering. --> black box visible. - Then switch to CPU rendering. No more black box. [black_artifact_bug3.blend](https://archive.blender.org/developer/F1139930/black_artifact_bug3.blend) ![blender_black_render_artifact_02.jpg](https://archive.blender.org/developer/F1139935/blender_black_render_artifact_02.jpg)

Zsolt Stefan commented

2017-11-15 11:00:57 +01:00

Changed status to: 'Open'

Zsolt Stefan commented

2017-11-15 11:00:57 +01:00

Added subscriber: @ZsoltStefan

blender-admin commented

2017-11-15 11:00:57 +01:00

#73424 was marked as duplicate of this issue

ronan ducluzeau commented

2017-11-15 16:21:15 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2017-11-15 16:21:15 +01:00

Here, problem appears with GPU only too.

If origin of the object is moved to center of geometry, problem is solved.

It looks like a duplicate bugreport of this #4835 that became a ToDo.

Here, problem appears with GPU only too. If origin of the object is moved to center of geometry, problem is solved. It looks like a duplicate bugreport of this #4835 that became a ToDo.

Brecht Van Lommel commented

2017-11-22 00:43:10 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-11-22 00:43:10 +01:00

Confirmed the artifacts, needs some investigation to figure out if this is a to do or new unknown case.

Zsolt Stefan commented

2019-04-17 16:44:46 +02:00

I would like to confirm that this bug is still present in Blender. Just checked with the example file and the 2.80 build from today.

Germano Cavalcante commented

2020-01-24 15:48:15 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-01-24 15:48:15 +01:00

I can confirm with OpenCL.
It has to do with the position of the object.
Here a simplified file:
cycles_gpu_bug.blend

I can confirm with OpenCL. It has to do with the position of the object. Here a simplified file: [cycles_gpu_bug.blend](https://archive.blender.org/developer/F8299502/cycles_gpu_bug.blend)

Jeroen Bakker commented

2020-01-27 07:47:38 +01:00

Added subscribers: @kurtloeffler, @ideasman42

Philipp Oeser removed the

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Black render artifact with CPU+GPU rendering in viewport #53324