some single letters have been taken over by megapov as reserved words. 
try making n a real word like my_n_variable to eliminate the possiblity
of conflict.

J Charter wrote:
> 
> >
> > >#macro PigmentFunc (n)
> >     #declare Pigment = pigment { bla bla n bla bla }
> > #end
> >
> >
> >
> > PigmentFunc (0.5)
> > texture {Pigment}
> >
> 
> I take it you tried:
> 
> n=0.5;
> PigmentFunc(n)

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