I was just surprised by an isosurface that was completely black
all over the bounding box in the volume with abs(x) > 1.
The reason was a square root of a negative number in
the isosurface function similar to the following.

isosurface {
   function{  y - sqrt(1 - x*x) }
   contained_by { box { -1.1, 1.1 }  }
   max_gradient 5
   texture {
     pigment {rgb <1/3,1/3,1>}
     finish {ambient 0.2 phong 1.0 phong_size 120}
   }
}

Sebastian

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