That's very interesting honestly.
But I see quite few issues, both theoretically and visually:
Visually: They look metallic, and shouldn't. Part of blame for this is imho that 0-glossy (absolute roughness) in Corona is still more specular than should. It's not diffuse enough, hence why your base layer looks more metallic than lambertian in very unnatural way.
Coating makes it look like a fully varnished wood, despite seeming attempt at having at least somehow rough wood.
Theoretically: Blending with (even though slightly distored) mirror to simulate fully grazing reflection, creates zero ramp-up in material roughness. But what should happen, is not only ramp-up in intensity, but also roughness, the specular reflection needs to look more rough at 0 angle, and rise up according to IOR. Your example, only ramps up intensity, creating varnished coating instead, no matter how rough the base layer is.
Now I understand blending mirror coating and fully rough base should blend the glossiness as well, but somehow it doesn't, or doesn't well.
To me it doesn't look more real at all and can't work imho in such simplified way. I have more issue with the coating than the base layer. Maybe try some rough example instead ?
« Last Edit: 2015-04-04, 19:39:53 by Juraj_Talcik »
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