"Zeger Knaepen" <zeg### [at] povplacecom> wrote in message 
news:47b29ef9$1@news.povray.org...
>
> it's called chromatic dispersion in POV-Ray: 
> http://www.povray.org/documentation/view/3.6.1/415/


Glad to see you guys answering this time of night-- well, almost 2 a.m. 
local time for me-- maybe you're someplace with daylight...? LOL

That last paragraph of 2.6.1.5 Dispersion, before the section about 
'caustics', will tell you this isn't about light being spread into actual 
wavelengths. You use 'photons' to get the light transported onto other 
surfaces or through air, otherwise this is only internal to transparent 
objects that are also refractive (ior 1 for the refraction is ok).

One of my favorite things about POV-Ray, such light characteristics. Great 
that it was thought of before the talk ended completely.

Bob

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