10.9.6 curveTube



  \begin{texgraph}[name=curveTube,export=pgf]
  Marges(0,0,0,0), size(7.5),
  S:=curveTube([i*t,2.5*sin(t)],0.75,-pi,pi,50,12),
  DrawFlatFacet(S,[color:=darkseagreen])
  \end{texgraph}

 PIC



curveTube