Am 28.02.2012 20:28, schrieb Christian Froeschlin:
> clipka wrote:
>
>> The translucency parameter specifies the so-called "mean free
>> distance" of a light ray in the material (in mm), i.e. the average
>> distance a light ray travels before it is either absorbed or
>> scattered. This can be more than 1.0 mm in case of very "waxy"
>> materials, and could theoretically be as large as infinity (for a
>> perfectly transparent material).
>
> It probably depends on photon wavelength as well, although I'm not
> sure that effect is strong enough to impact the visual perception of
> an object with translucency.

The wavelength-dependency of the mean free distance is indeed quite 
significant in some materials; that's why translucency is an RGB parameter.

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