Transparent object becomes opaque in lookdev mode #89132

New Issue

Chris Margach · 2021-06-14T09:56:39+02:00

Chris Margach commented

2021-06-14 09:56:39 +02:00

System Information
Operating system: macOS-11.5-x86_64-i386-64bit 64 Bits
Graphics card: eGPU AMD Radeon RX 6900 (reported as internal Intel(R) Iris(TM) Plus Graphics OpenGL Engine Intel Inc. 4.1 INTEL-16.5.1)

Blender Version
Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: 84da05a8b8
Worked: (newest version of Blender that worked as expected) 2.83.15

Short description of error
When a Principled BSDF material is set with transmission 1.000 and Roughness below 0.0038, the material displays as opaque in lookdev.

Exact steps for others to reproduce the error
In blender 2.93, create a new file.
Change to shading view
Set transmission on material of default cube to 1.00
Reduce roughness of same material below 0.0038

Even after setting roughness to 0, the object will display as expected in blender 2.83.15

**System Information** Operating system: macOS-11.5-x86_64-i386-64bit 64 Bits Graphics card: eGPU AMD Radeon RX 6900 (reported as internal Intel(R) Iris(TM) Plus Graphics OpenGL Engine Intel Inc. 4.1 INTEL-16.5.1) **Blender Version** Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: `84da05a8b8` Worked: (newest version of Blender that worked as expected) 2.83.15 **Short description of error** When a Principled BSDF material is set with transmission 1.000 and Roughness below 0.0038, the material displays as opaque in lookdev. **Exact steps for others to reproduce the error** In blender 2.93, create a new file. Change to shading view Set transmission on material of default cube to 1.00 Reduce roughness of same material below 0.0038 Even after setting roughness to 0, the object will display as expected in blender 2.83.15

Chris Margach commented

2021-06-14 09:56:39 +02:00

Added subscriber: @cagram

Leon Zandman commented

2021-06-14 10:26:15 +02:00

Added subscriber: @Zandman

Leon Zandman commented

2021-06-14 10:26:15 +02:00

I see no difference between those Blender versions. But maybe I don't know what you mean? Screenshots would help.

Here I've set Roughness to 0.002, so well below the value you indicated. It shouldn't be like this?

I see no difference between those Blender versions. But maybe I don't know what you mean? Screenshots would help. Here I've set Roughness to 0.002, so well below the value you indicated. It shouldn't be like this? ![Screen Shot 2021-06-14 at 10.21.48.png](https://archive.blender.org/developer/F10170634/Screen_Shot_2021-06-14_at_10.21.48.png)

Chris Margach commented

2021-06-14 10:46:59 +02:00

Sorry, I should have attached screenshots. That is not the display I get.
I have attached screenshots of the below 3 cases. FYI I originally got this when I set the roughness to 0. Then I tried to find at which exact value this occurs.
I also tried this on my internal display and got the same result.

Working in 2.83
Not working in 2.93
Working in 2.93

![2.93 not working.png](https://archive.blender.org/developer/F10170665/2.93_not_working.png) ![2.93 working.png](https://archive.blender.org/developer/F10170666/2.93_working.png) ![2.83 working.png](https://archive.blender.org/developer/F10170667/2.83_working.png) Sorry, I should have attached screenshots. That is not the display I get. I have attached screenshots of the below 3 cases. FYI I originally got this when I set the roughness to 0. Then I tried to find at which exact value this occurs. I also tried this on my internal display and got the same result. Working in 2.83 Not working in 2.93 Working in 2.93

Leon Zandman commented

2021-06-14 11:08:25 +02:00

I notice the left ball in the lower right corner of the Shading view doesn't look like a reflecting mirror ball, but is pitch black. Does it also look like that when you start Blender, load factory defaults and go to the Shading tab? It should look like this:

I notice the left ball in the lower right corner of the Shading view doesn't look like a reflecting mirror ball, but is pitch black. Does it also look like that when you start Blender, load factory defaults and go to the Shading tab? It should look like this: ![Screen Shot 2021-06-14 at 11.08.04.png](https://archive.blender.org/developer/F10170709/Screen_Shot_2021-06-14_at_11.08.04.png)

Pratik Borhade commented

2021-06-14 11:29:06 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-06-14 11:29:06 +02:00

reported as internal Intel(R) Iris(TM)

I fear to close the task as a duplicate of #88754 (Intel HD graphics: Changing Roughness Value to 0 causes mesh to be black).

>reported as internal Intel(R) Iris(TM) I fear to close the task as a duplicate of #88754 (Intel HD graphics: Changing Roughness Value to 0 causes mesh to be black).

Chris Margach commented

2021-06-14 14:12:22 +02:00

@Zandman

Does it also look like that when you start Blender, load factory defaults and go to the Shading tab?

Yes, please see attached screenshot. FYI it appears white for the briefest of moments (not silver) before turning black.

@PratikPB2123
I confirmed that both versions are reporting the Intel chipset.

@Zandman >Does it also look like that when you start Blender, load factory defaults and go to the Shading tab? Yes, please see attached screenshot. FYI it appears white for the briefest of moments (not silver) before turning black. ![2.93 factory defaults.png](https://archive.blender.org/developer/F10170862/2.93_factory_defaults.png) @PratikPB2123 I confirmed that both versions are reporting the Intel chipset.

Pratik Borhade commented

2021-06-19 04:57:34 +02:00

Closed as duplicate of #88754

Pratik Borhade closed this issue

2021-06-19 04:57:34 +02:00

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Transparent object becomes opaque in lookdev mode #89132