--snipp (part of the photon.html)
Dispersion

Daren Scott Wilson's dispersion patch has been incorporated into the
photon mapping patch. To use it with
photons, you need to specify a color_map in your light source. The
color_map will override the light's color
(although you still need to specify the color of the light). The
color_map determines the color spectrum for that light
source.

I have created a macro, "create_spectrum", which creates a color_map for
use with lights. This macro is based on
Mr. Wilson's dispersion patch. See the demo scene "prism" for this
macro.
--snapp
macro, "create_spectrum" is there any posibility to download this file
thanks 
merath

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