you wonder how to use the "roughness material stage" with a standard HDRI?
Well, for the actual version you need to set the "prefilter method" for the "IBL - Specular" Stage and the "SkyBox - Node" to "default".
For the upcoming versions this will be changed. Per default the "non prefilter" will also support a "faked roughness".
Here is a small how to :
Hope this helps a bit
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