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On Tue, 19 Nov 2002 17:53:19 +0100, "J Tellings"
<j_t### [at] hotmail com> wrote:
>I want to make a table of highly reflective and transparent glass. How can i
>do this?
Look outside the window. If it's bright outside, you can not see a
reflection. If it is dark outside, you can not see anything there, but
you see a nice reflection.
That is to say, the realism of your scene will depend on what's behind
the glass.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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"J Tellings" <j_t### [at] hotmailcom> wrote in message
news:3dda6c7e$1@news.povray.org...
>
> I want to make a table of highly reflective and transparent glass. How can
i
> do this?
If you use your own custom glass texture (material) instead of a predeclared
glass, you can make it have a variable reflection which also factors in the
index of refraction (ior) by putting keyword 'fresnel' into the 'reflection'
statement. Like so:
material {
texture {
pigment {rgb <1,1,1> filter 1} // colored transparency
finish {
reflection {0.25, 0.5 fresnel} // min., max. reflectivity
ambient 0 diffuse 0 // cancel any surface color effects
specular 1 roughness 0.005 // highlight
conserve_energy // helps tone down object brightness due to
reflection
} // finish
} // texture
interior {ior 1.5} // refraction (used by fresnel too)
interior_texture {
pigment {rgb <1,1,1> filter 0.1} // colored transparency
finish {
reflection {0.5, 1.0 fresnel} // min., max. reflectivity
ambient 0 diffuse 0 // cancel any surface color effects
specular 1 roughness 0.005 // highlight
conserve_energy // helps tone down object brightness due to
reflection
}
} // interior_texture
} // material
The above shows a different reflectivity in one direction through the glass
by using interior_texture. That way it will look clearer on the outside
surfaces and more mirror-like on the inside surfaces. Or you could change it
around, vary the values, etc. If you don't want the reflection to be based
on refraction then remove the fresnel keyword.
--
Farewell,
Bob
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