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I don't remember Chris Colefax's include file and don't know sources for POV 3.5
but it is logical for me if there are two things within 3.5 with the same name
then they are similiar. So check cubic_spline desciption within Lathe chapter
(6.5.1.7) - perhaps there could be some answers to your question.
ABX
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#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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