POV 3.5b7 windows version

Within "6.5.4.1  Isosurface Syntax" 'max_gradien' keyword is listed in syntax
specification without brackets so it is not optional but required but parser
works fine when it is not in script and text of this chapter says for 'evaluate'
"If you didn't specify this gradient with the max_gradient keyword...".

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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