Completely black Shading when roughness set to 0.003726621 or below, on EEVEE #89569

New Issue

Juan Ignacio Gil-Hutton · 2021-07-01T00:56:08+02:00

Juan Ignacio Gil-Hutton commented

2021-07-01 00:56:08 +02:00

System Information
Operating system: Windows 10 & Debian 10 KDE
Graphics card: Intel HD620 integrated graphics

Blender Version
Broken: 2.93; 2.93.1; 3.0.0 alpha
Worked: 2.92

Short description of error

This only happens on versions of blender from 2.93 onwards.
Any material where its final glossy roughness value is set between 0.0 and 0.003726621... is automatically shaded pure black, as if it had no shader at all.
Diffuse roughness works properly.
Viewport render view AND final render, on EEVEE, have the same problem

The following combinations cause a black material:

The problem even bypasses the mix node

In the following video I set roughness to 0 and shader goes full black. I switch to Cycles and the problem disappears:

09flu1veih771.mp4

The value "0.003726621" is rounded by Blender to 0.004.
The value "0.003726621" was found adding half an nth for every new digit:
0.00372663 yields a correct behaviour of the shader
0.00372662 results in a shadeless, black, material; add 0.000000005 and try again.
This number goes on and on.

Exact steps for others to reproduce the error
Shadeless.blend

Default startup.
Use the default cube.
Apply any shader with a glossy roughness property.
Set glossy roughness to any value between 0 and 0.003726621.
This causes a shadeless material. Completely black.

The fact that I couldn't find any info about this bug at all on the internet tells me that my hardware is causing the problem. I did manage to find people with the same problem, but only a handful.
https://www.reddit.com/r/blender/comments/o7yeib/completely_black_shading_when_roughness_set_to_00/

**System Information** Operating system: Windows 10 & Debian 10 KDE Graphics card: Intel HD620 integrated graphics **Blender Version** Broken: 2.93; 2.93.1; 3.0.0 alpha Worked: 2.92 **Short description of error** - This only happens on versions of blender from 2.93 onwards. - Any material where its final **glossy roughness** value is set between 0.0 and 0.003726621... is automatically shaded pure black, as if it had no shader at all. - Diffuse roughness works properly. - Viewport render view AND final render, on EEVEE, have the same problem The following combinations cause a black material: ![Captura de pantalla (114).png](https://archive.blender.org/developer/F10207012/Captura_de_pantalla__114_.png) The problem even bypasses the mix node In the following video I set roughness to 0 and shader goes full black. I switch to Cycles and the problem disappears: [09flu1veih771.mp4](https://archive.blender.org/developer/F10207015/09flu1veih771.mp4) The value "0.003726621" is rounded by Blender to 0.004. The value "0.003726621" was found adding half an *nth* for every new digit: 0.00372663 yields a correct behaviour of the shader 0.00372662 results in a shadeless, black, material; add 0.000000005 and try again. This number goes on and on. **Exact steps for others to reproduce the error** [Shadeless.blend](https://archive.blender.org/developer/F10207032/Shadeless.blend) Default startup. Use the default cube. Apply any shader with a glossy roughness property. Set glossy roughness to any value between 0 and 0.003726621. This causes a shadeless material. Completely black. **The fact that I couldn't find any info about this bug at all on the internet tells me that my hardware is causing the problem. I did manage to find people with the same problem, but only a handful.** https://www.reddit.com/r/blender/comments/o7yeib/completely_black_shading_when_roughness_set_to_00/

Juan Ignacio Gil-Hutton commented

2021-07-01 00:56:08 +02:00

Added subscriber: @jgilhutton

Juan Ignacio Gil-Hutton commented

2021-07-01 01:26:29 +02:00

I just realized this is a duplicate of
https://developer.blender.org/T88754
Couldn't manage to close it as duplicate myself.

I just realized this is a duplicate of https://developer.blender.org/T88754 Couldn't manage to close it as duplicate myself.

Ray molenkamp commented

2021-07-01 01:40:34 +02:00

Closed as duplicate of #88754

Ray molenkamp closed this issue

2021-07-01 01:40:34 +02:00

Thomas Dinges added this to the 2.93 LTS milestone 2023-02-07 18:46:13 +01:00

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Completely black Shading when roughness set to 0.003726621 or below, on EEVEE #89569