Blender V2.80 does not render Geometry/Backfacing - Shader Editor #62145

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Andrew Sprok · 2019-03-03T02:29:03+01:00

Andrew Sprok commented

2019-03-03 02:29:03 +01:00

System Information
Operating system: Windows 10
Graphics card: AMD Radeon R9 200 Series (ASUS R9 290X DirectCU II OC)

Blender Version
Broken:
V2.80, 490a385c81, 2018-03-02
Worked:
Blender V2.79b

When creating a material with an image texture and with a different colour on the back side of the object, using a png file with transparency, it does not render with Device setting 'GPU Compute'. The viewports show the object with the correct texture and render but in the render window the object, with the front and back different colours, renders black. When switching to CPU then the render is correct. This exact same setup works in V2.79b

I attached a test file which demonstrates this. I also attached the exact png image I used for this test. The renderings I attached was made with the CPU, the red is the front and the blue is the back face of the object.

The black object is rendered from the back face with the GPU Compute settings, which demonstrates the problem.

TestBackfaceRendering.blend

**System Information** Operating system: Windows 10 Graphics card: AMD Radeon R9 200 Series (ASUS R9 290X DirectCU II OC) **Blender Version** Broken: V2.80, 490a385c8124, 2018-03-02 Worked: Blender V2.79b When creating a material with an image texture and with a different colour on the back side of the object, using a png file with transparency, it does not render with Device setting 'GPU Compute'. The viewports show the object with the correct texture and render but in the render window the object, with the front and back different colours, renders black. When switching to CPU then the render is correct. This exact same setup works in V2.79b I attached a test file which demonstrates this. I also attached the exact png image I used for this test. The renderings I attached was made with the CPU, the red is the front and the blue is the back face of the object. The black object is rendered from the back face with the GPU Compute settings, which demonstrates the problem. ![image.png](https://archive.blender.org/developer/F6749924/image.png) ![image.png](https://archive.blender.org/developer/F6749928/image.png) ![image.png](https://archive.blender.org/developer/F6749948/image.png) ![Rodin Basic 36x36 V2 - transparent-11.png](https://archive.blender.org/developer/F6749957/Rodin_Basic_36x36_V2_-_transparent-11.png) [TestBackfaceRendering.blend](https://archive.blender.org/developer/F6749953/TestBackfaceRendering.blend)

Andrew Sprok commented

2019-03-03 02:29:03 +01:00

Added subscriber: @DrSpock

Andrew Sprok changed title from ~~Blender V2.80 does not render Geometry/Backfacing~~ to Blender V2.80 does not render Geometry/Backfacing - Shader Editor

2019-03-03 22:53:46 +01:00

Sebastian Parborg commented

2019-03-04 12:00:11 +01:00

Added subscribers: @Jeroen-Bakker, @ZedDB

Sebastian Parborg commented

2019-03-04 12:00:11 +01:00

@Jeroen-Bakker can you take a look at this? I'm guessing this is OpenCL related.

Jeroen Bakker was assigned by Sebastian Parborg

2019-03-04 14:29:23 +01:00

Jeroen Bakker commented

2019-03-14 08:53:35 +01:00

In foreground rendering it seems to be correct. Only fails when in background rendering.

Does not seem to be related to transparency. Using emision shaders also shows the problem.
Might be a mismatch of shader node groups in svm.h will research

In foreground rendering it seems to be correct. Only fails when in background rendering. Does not seem to be related to transparency. Using emision shaders also shows the problem. Might be a mismatch of shader node groups in `svm.h` will research

blender-admin commented

2019-03-14 09:20:11 +01:00

This issue was referenced by blender/cycles@eefc168537

This issue was referenced by blender/cycles@eefc168537d36de6e29dfd071d37538ac9e1638a

blender-admin commented

2019-03-14 09:20:11 +01:00

This issue was referenced by 4887baf7d6

This issue was referenced by 4887baf7d69c6c44c265044600ec00c77e9aa406

Jeroen Bakker commented

2019-03-14 09:27:06 +01:00

Changed status from 'Open' to: 'Resolved'

Jeroen Bakker closed this issue

2019-03-14 09:27:06 +01:00

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Reference: blender/blender#62145

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Blender V2.80 does not render Geometry/Backfacing - Shader Editor #62145