Thanks to all for your help.

Now, i use :

   #local thisHSL = rgb <360*i/N, 1, 0.40>;
   #local thisRGB = CHSL2RGB(thisHSL);

and
   pigment { color rgb <thisRGB,0,0> }

... and all is OK :)



-- 
Kurtz le pirate
Compagnie de la Banquise

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