[Bf-cycles] Principled BSDF Transmission behaviour

Marco G marco.gzt at gmail.com
Thu Sep 6 21:48:06 CEST 2018

Hi devs,
would be possible to get a air like / fully transparent behaviour when
setting IOR = 1.000 to the Transmission value, in the Principled BSDF?
Right now it gets full black

This (transparency like Air IOR), already happens in the Refraction shader
so i suppose it makes sense. It's also very useful when setting up
materials with no distorsion from refractions but high reflectivity (think
about architectural glass for windows, thin highly reflective plastic
sheets, an helicopter cockpit... etc)

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