"Mueen Nawaz" <m.n### [at] ieeeorg> wrote in message 
news:41b64dfe$1@news.povray.org...
>
> Consider a bottle. It's base is flat, but the edges of the base are 
> rounded and then go up vertically. Getting it rounded was not much of a 
> problem, but then I could not get the "line" to go up vertically.

Try a bezier_spline, as in:

lathe {
  bezier_spline // four points per segment
  8,
  <0, 0>, <0.95, 0>, <1, 0.05>, <1, 0.1>
  <1, 0.1>, <1, 2>, <1, 3>, <1, 4>
}

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