"AaronD" <aar### [at] yahoocom> wrote in message 
news:web.47b97198297bdf4b256ade900@news.povray.org...
>
> I want to specify the index of refraction for each color, in the number of 
> steps
> that I specify (just as with dispersion) only in a customized way, for 
> example:
>
> n=2 for red part of spectrum
> n=1 for middle part of spectrum
> n=3 for violet part of spectrum
>
> Since I cannot do this with the dispersion property, how can I do this? 
> This
> looks like it should be very easy to implement, given that POV-Ray can 
> already
> handle normal dispersion.  I just need to access the array where the 
> indices
> are held, if that is how dispersion works.


Not sure about the program source code regarding that but you could do this, 
before interior {} was introduced, by using averaged textures. That's 
because finish {} had the ior within it in versions prior to 3.5. Checking 
on that, I don't think it's backwards compatible even using the #version 
change meaning you would need to use POV 3 if doing it in the SDL, if 
possible at all.

I have a file made from what Daren Scott Wilson first created, and his idea 
became the 'dispersion' used now in POV.

http://webpages.charter.net/omniverse/private/spectrar.zip

Maybe you can do something with it, if not the program source code. This 
does NOT work in versions 3.5 or above.

-- 
/*bob hughes*/

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