Slime wrote:
> 
> This question applies to 3.5...
> 
> So, what exactly the "Fresnel reflectivity function?" What sort of
> calculations are going on with this? And it seems to create variable
> reflection... is this more accurate than normally specifying two reflection
> values? I'm just wondering what this keyword is really *doing*...
> 

Have a look at:

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/freseq.html
http://dustbunny.physics.indiana.edu/~dzierba/P360n/KPAD/Exps/Fresnel/fresnelnote.pdf

Normal variable reflection has a linear transit between min and max
according to the cosine of the angle, if you use a higher falloff value
you can get pretty much similar results, but note that the fresnel model
depends on the ior of the material.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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