As the Subject says, I'm very new at this, and not sure what I'm doing wrong.
The image I am trying to render is one of a sphere of nested multi colored
spheres with a wedge removed to reveal the inner layers. I get what I think I'm
suppose to get, except the inner spheres are speckled with lots of black pixels.

I read the piece about coincident surfaces causing this effect, but if that is
what the problem is, I don't know what surface needs moving.

Can anyone tell me what I've done wrong?

Jonathan
---------------------

Here's my .pov file contents:

  #include "colors.inc"
  camera
  {
    location <0, 10, -20>
    look_at 0
  }
  light_source
  {
    <30, 20, -30>
    color White
    spotlight
    radius 15
    falloff 20
    tightness 10
    point_at <0, 0, 0>
  }
  #declare Crust = difference
  {
    sphere
    {
      <0, 0, 0>, 10
      pigment {Blue}
    }
    box
    {
      <0, 0, 0>, <10, 10, -10>
      pigment {Blue}
    }
  }
  #declare Mantle = difference
  {
    sphere
    {
      <0, 0, 0>, 9.5
      pigment {Brown}
    }
    box
    {
      <0, 0, 0>, <9.5, 9.5, -9.5>
      pigment {Brown}
    }
  }
  #declare OuterCore = difference
  {
    sphere
    {
      <0, 0, 0>, 6
      pigment {Yellow}
    }
    box
    {
      <0, 0, 0>, <6, 6, -6>
      pigment {Yellow}
    }
  }
  #declare InnerCore = difference
  {
    sphere
    {
      <0, 0, 0>, 3
      pigment {Red}
    }
    box
    {
      <0, 0, 0>, <3, 3, -3>
      pigment {Red }
    }
  }
  #declare NestedSpheres  = merge
  {
    object {InnerCore}
    object {OuterCore}
    object {Mantle}
    object {Crust}
  }
  object
  {
    NestedSpheres
    rotate y*30
    rotate x*-10
  }

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