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Date: Sat, 20 Apr 1996 10:53:12 -0700
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From: larrys@swcp.com (Larry Shultz)
To: Multiple recipients of list <lightwave@garcia.com>
Subject: Re: Mirrors...
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>
> I was talking to my friend the other day, and an interesting
>problem came up... What is th colour of a mirror. We see every wavelength
>of light being reftected off of it, but then again the color white also
>reflects every wavelenght.. Tha't why we see it as white. So the problem
>still remains, what is the base color of a mirror.
> I know you're supposed to use the color black in any renderer,
>but why is that? Shouldn't you have a silvery color?
>
> Can someone shed some light on this? Or maybe explain to me
>how a mirror differs from a dull object!
A dull object scatters light in all directions and a specular object (a mirror being the worst case)
tends to reflect light at an angle equal to the angle of incidence, in other words its not scattered
in many directions. An object that seems to add color to reflected light like red chrome actually
absorbs everything except red. A mirror doesnt have a silver color because their isnt a color called
silver. Its all based on a combination of absorbed/reflected colors and dull/specular surfaces working
in combination with each other. In Lightwave you make a reflective surface black with a high
degree of reflectivity and specularity to simulate a mirror like surface.