"Tim Attwood" <tim### [at] comcastnet> wrote in message 
news:47c34a7b$1@news.povray.org...
>> Do you know if
>> "normal" reflections happen (about) equally when going from less dense
>> medium to denser medium when compared to opposite situation?
>
> Yes, the inside of a RL glass surface reflects about the same as
> the outside, sometimes a bit more reflective, since grime can
> build up on the outside, but not on the inside.

Are you sure?  A watersurface seems a lot more reflective from underneath 
the water than from above the water. Could be an optical illusion though.

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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