Wasn't it Tim Nikias who wrote:
>> What you need to change is the original declaration of Snowfunction,
>> which is somewhere outside your macro. Stick a ".x" on that declaration
>> and you'll be working with non-pigment functions throughout.
>
>Another thing: Where exactly do I put that ".x"? I've got
>#declare Snow_Pig_Turb = pigment{bozo color_map{[0 rgb 1][1 rgb .85]}}
>#declare SnowFunction = function{pigment{Snow_Pig_Turb}}

I think you need to add an extra step

#declare Snow_Pig_Turb = pigment{bozo color_map{[0 rgb 1][1 rgb .85]}}
#declare Pig_Function = function{pigment{Snow_Pig_Turb}}
#declare SnowFunction = function{Pig_Function(x,y,z).x}

-- 
Mike Williams
Gentleman of Leisure

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