> > I know there is workaround with functions, macros, pigments and other things but
> > I vote for:
> > 
> >   #declare Image=image_map{...}
>
> #declare Image = pigment { image_map {...} }
> object { my_object pigment { Image } }

As I said I know about such workarounds. That's why I didn't wrote 'help needed'
however thanks for good intentions. :)

ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35

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