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variable tube radius and variable surface thickness


How is changing radius toroid implemented?

How is changing thickness of surface implemented?

Thanks in advance for reply. 

Regards
Narasimham

TR[t_] = .2 + .15 Cos[ t]
Plot[TR[t], {t, 0, 2 Pi}]
g1 = ParametricPlot3D  [{Cos[t], Sin[t], 0}, {t,Pi,2 Pi}, 
  PlotRange -> All, PlotStyle -> Tube[TR[t]]]
TR[t_] = .2
g2 = ParametricPlot3D  [  {  Cos[t], Sin[t], 0}, {t, 0, Pi},PlotRange -> All, PlotStyle -> Tube[.2] ]
Show[g1, g2]



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