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#ActualStyves

Posted 27 June 2013 - 07:54 AM

The main idea behind the paper's use of the Kelemen-Szirmay BRDF is physically based specular. Since you already have a pretty good physically based BRDF, I don't think there's any need to use the KSK model for skin (especially if you're using deferred). A PBR model is all you need. smile.png

 

The only reason behind it is that skin has a lower specularity when facing it directly, but at grazing angles it gets much brighter. Basically, fresnel is very important to achieving realistic skin.


#1Styves

Posted 27 June 2013 - 07:52 AM

The main idea behind the paper's use of the Kelemen-Szirmay BRDF is physically based specular. Specularity should get brighter at grazing angles (always taking into account energy conservation of course). Skin has a very low specularity when facing it directly but at grazing angles it's far more reflective - this is a key element in making realistic skin. Without such a BRDF you'd have too strong specular all the time, or not enough.

 

Since you already have a pretty good physically based BRDF, I don't think there's any need to use the KSK model for skin (especially if you're using deferred). A PBR model is all you need. :)


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