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In article <3fb2af10@news.povray.org>, Warp <war### [at] tag povrayorg>
wrote:
> Christopher James Huff <cja### [at] earthlinknet> wrote:
> > glass reflection isn't really very variable.
>
> That depends a lot in the type of glass and its coating layer.
> There are certain types of glass surface finishes which exhibit a very
> pronounced variable reflection. When you look at the glass right from
> the front, it reflects some, but you can mostly see through it. However,
> when you look at it at a sharp angle, it's almost like a mirror.
True, but the surface coating that shows these effects usually isn't
glass, but polymers to reinforce the glass, protect it from weathering,
and block glare and UV. I haven't seen any glass that shows strong
variable reflection...but I haven't looked at many types. There may be
types that show this effect more strongly...
Surface coatings like this are something to keep in mind when making
textures, though...as another example, a colored, dull object may have a
colorless reflective glaze. Since the reflection comes from a colorless
material, it is not tinted with the color of the surface. A chrome ball
with a transparent red coating will have very different reflections from
a red ceramic ball with clear glaze.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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"Christopher James Huff" <cja### [at] earthlinknet> wrote in message
news:cja### [at] netplexaussieorg...
> Because you're using it wrong. First, fresnel reflection varies from 0
> to 1 by default, so "reflection {fresnel}" isn't even remotely
> equivalent to "reflection {0.2, 0.4}". And second...glass reflection
But I thought fresnel used the interior ior to calc. reflections? Isn't the
implication that if you get the ior right, then fresnel should produce the most
realistic result?
As Warp says, glass does seem to have very variable reflection depending on the
angle at which it's viewed. I make no claim to understanding the issues - just a
claim that I'm confused....
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