"PeterKetting" <pet### [at] myrealboxcom> wrote in message
news:3c92420a@news.povray.org...

<snip>

A sphere is probably the easiest shape to understand the concept of inverse.

sphere{0,1} = a solid sphere centred at <0,0,0> with a radius of 1 pov unit
sphere{0,1 inverse} =  a solid pov-universe with a small spherical hole at the
center....

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