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Iridescence calculations depend upon the dominant wavelengths of the
primary colors of red, green and blue light. You may adjust the values using
the global setting irid_wavelength as follows...
global_settings { irid_wavelength COLOR }
The default value is rgb <0.25,0.18,0.14> and any
filter or transmit values are ignored. These values are proportional to the
wavelength of light but they represent no real world units.
In general, the default values should prove adequate but we provide this option as a means to experiment with other values.
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