10.9.18 lineTube



  \begin{texgraph}[name=lineTube,export=pgf]
  Marges(0,0,0,0), size(7.5),
  L:=for z in polyreg(0, 3.5, 6)
     do [z,0] od,
  S:=lineTube(L, 1, 12, 1),
  DrawFlatFacet(S,[color:=steelblue,
                   backculling:=1])
  \end{texgraph}

 PIC



lineTube