Operating system: Windows 64bit
Graphics card: GTX 950
Broken: (example: 2.81 Alpha, ad21a6c22461, 2019-09-08
Short description of error
When renderign with Eevee I get ring shaped bright spots around GGX highlights.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Start with a new file, delete the vertex at position 1, -1, 1
Add a metarial to this cube.
set metallic to 1
set roughness to a value between 0.2 and 0.4
set the power of the pointlight to 100W
set the radius to 0
move it to (0.5, -0.5, 0.5)
set the background color to black
view it from the top in perspective mode
you should see a grey ring at a corner.
In my personal experience this might be caused by an unnormalized vector in the ggx calculation.
The .blend file and a screenshot:
Indirect Lighting settings dont help since there is no indirect lighting going on. As far as I can see it's a problem with the microfacet shading.