nemesis schrieb:
>> Is this a macro?
> 
> by legendary Sam Benge.

So chances are it works by overlaying zillions of shifted variants of 
the pigment ;-)

I presume that somewhere in the process Sam used the input file to drive 
a color_map or such. In that case, unfortunately HDRI colors are 
"wrapped" to the 0..1 range. In that case the macro would need a major 
overhaul to make it work with HDR images.

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