[Bf-cycles] Cycles Fresnel behaviour

storm kartochka22 at yandex.ru
Sat Jan 10 00:07:31 CET 2015

It have no sense, as Fresnel node paired with mix node assume layered
physical surface, with infinite small almost flat dielectric last layer
(coat). By definition, if you assume microfaset it will broke whole idea
about Freshel equation, as it related only to almost perfect(with
respect to wavelength) polished boundary between media with different
IOR. If you want Freshnel- like law with microfacet, you will end with
extreme complex Maxwell equation that hard (impossible for me) to solve.

В Пт, 09/01/2015 в 21:44 +0100, Marco G пишет:
> @storm - what i've read it's not related to more physically correct
> glossy, the point highlighted in many sources is about Fresnel, which
> needs to be computed per-microfacet.
> A user following the list kindly pointed me to the same very topic on
> this list, back in 2013, and gave me permission to link back here.
> It's what i've tried to say (though my understanding of what's
> involved is much more limited)
> Hope this clear things up a bit. By "improving" this - if feasible -
> artists should get better shading when fresnel and rough glossy are
> involved (i.e. a ton of materials, not really corner cases), both at
> grazing angles and at facing normal, like the head examples from
> arnold.
> http://lists.blender.org/pipermail/bf-cycles/2013-May/001397.html
> Regards,
> MG
> 2015-01-07 10:11 GMT+01:00 gandalf3 <zzyxpaw at gmail.com>:
>         Just in case anyone is wondering, I think this is the project
>         storm was
>         talking about:
>         http://blender.45788.x6.nabble.com/Realistic-Nk-Data-Metal-BSDF-td116555.html#a116623
>         --
>         -gandalf3
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