On Wed, 23 Jun 1999 19:01:26 +0200, ingo wrote:
>
>The last line gives the problem. If you delete pigment{Blue}, the hole in the
>lens is black.
>- Is the POV-Doc in error?
>- Is it a bug in POV-Ray?
>- If the first is true, can POV-Ray be changed in such a way that it can also
>behave like described in the doc?

If the documentation says that, it is in error.  It would be exceedingly
difficult to do what the documentation says it does.  For example, what
color should the cylinder be in this example? (just like the one in the
docs, but with different coloring) 

difference {
  intersection {
    sphere { <0, 0, 0>, 1
      translate -0.5*x
      pigment { Green }
    }
    sphere { <0, 0, 0>, 1
      translate 0.5*x
      pigment { Yellow }
    }
    rotate 90*y
  }
  cylinder { <0, 0, -1> <0, 0, 1>, .35 }
}

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