Christoph Hormann <chr### [at] gmxde> wrote in
news:3D73D349.3106ABAC@gmx.de: 

> 
> 
> Marc Champagne wrote:
>> 
>> Hi Folks,
>> 
>> Since POV-Ray simulates dispersion and allows values of 1 or higher,
>> how does one take a real dispersion value like quartz (0.013) and
>> apply it to the dispersion keyword?
>> 
>> Is it safe to assume that dispersion 1.013 will give us a simulated
>> dispersion of 0.013?
> 
> Technical dispersion values are often given as the *difference* in ior
> between two wavelengths while POV-Ray uses the *ratio* of ior values
> at both ends of the spectrum.  Therefore your formula is approximately
> correct although the wavelengths used for defining the dispersion are
> not necessarily the ends of the visible spectrum.
> 
> Christoph
> 

Then it's as close as one can get to reality without splitting atoms :)

I've been educating myslef on the art of cutting diamonds lately (for
the sole purpose of ray-tracing) and am trying to apply all know factors
into the design.

So far so good, I shall have some diamonds for sale shortly (completly
weightless, these are *rare*), I'll surely post some images in p.b.i.
for all to see. 

Thanks

Marc

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