Setting Roughness to zero (0) breaks shader in eevee #89550

New Issue

Franklyn Afeso · 2021-06-30T10:27:10+02:00

Franklyn Afeso commented

2021-06-30 10:27:10 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics Intel 4.5.0 - Build 27.20.100.8681

Blender Version
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: 1b8d33b18c
Worked: (2.92.0)

Short description of error
[whenever I set the roughness value of the principled bsdf shader to 0 while in eevee or lookdev mode, the object becomes black. Increasing the roughness to a value >= 0.004 works and this has been my workaround till recently when it broke a nodegroup that I couldn't find what was affecting the roughness value]

Exact steps for others to reproduce the error

Launch blender,
switch to the shading tab
the glossy hdri preview is black.
change roughness of principled shader to 0,
object becomes black no matter if its metallic or not.

Here are some screenshots.

roughness of zero

roughness of 0.004

roughness of 0 albeit in blender 2.92.0 where it works normally.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Intel(R) UHD Graphics Intel 4.5.0 - Build 27.20.100.8681 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `1b8d33b18c` Worked: (2.92.0) **Short description of error** [whenever I set the roughness value of the principled bsdf shader to 0 while in eevee or lookdev mode, the object becomes black. Increasing the roughness to a value >= 0.004 works and this has been my workaround till recently when it broke a nodegroup that I couldn't find what was affecting the roughness value] **Exact steps for others to reproduce the error** - Launch blender, - switch to the shading tab - the glossy hdri preview is black. - change roughness of principled shader to 0, - object becomes black no matter if its metallic or not. Here are some screenshots. ![Screenshot (165).png](https://archive.blender.org/developer/F10206397/Screenshot__165_.png) roughness of zero ![Screenshot (166).png](https://archive.blender.org/developer/F10206399/Screenshot__166_.png) roughness of 0.004 ![Screenshot (164).png](https://archive.blender.org/developer/F10206402/Screenshot__164_.png) roughness of 0 albeit in blender 2.92.0 where it works normally.

Franklyn Afeso commented

2021-06-30 10:27:10 +02:00

Added subscriber: @afeso