"Claudio" <ccr### [at] bolcombr> wrote in message
news:3e4d48cb@news.povray.org...

> Should I use a modeller? Or maybe the default objects provided by the
system
> are enough?

You can create this quite easily using the pov sdl - using a modeller is
certainly not required for this.

the interior of a sphere is concave, so:

difference{
  sphere{0,1.001}
  sphere{0,1}
  plane{z,0}
  pigment{White}
  finish{diffuse 0 ambient 0 reflection 1}
}

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