wrote:
> Here are my propositions:

I forgot about lathe proposition.

There could be yes/no switch to rotate on/off spline during rotation around y
axis. Somethin like (corosssection):

  / | \
 /  |  \
<   |   >
 \  |  /
  \ | /

and

  / |   /
 /  |  /
<   | <
 \  |  \
  \ |   \

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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