> Hello! I didn't find anything in the help files, so I ask here: Is it
> true, that there is no logic AND or && or OR or || in #if-statements
> available?

Look for "logical" keyword at
http://www.povray.org/working-docs/id000135.html#6_1_3

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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