I don't understand how radial works with non integer frequencies.

Let's take a simple one :
#declare MyP = pigment{ radial
         frequency F
         phase P
         pigment_map {
                [0.5 Black]
                [0.5 White]}}

I want F to grow from .1 to 10, and I want the Black color to start at the 
fixed position (+x, -z, I don' t care). What is the value of P which achieve 
this ?

It looked simple to me at first, but I must say that I going to give up. Any 
one can help ?


Alain

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