TIC, Andy. :) The author implied it was the coding that was in error. No big
deal.
I continue to get email on this, so here's an overhead view with a cylinder
marking a straight line from the original camera point to the point in
question.
-----------------------------------
camera { location <0,20,-6> direction z look_at <0,0,-6> }
light_source { <0,0,-12> color rgb 1 shadowless }

background { color rgb 1 }

sphere{<0,0,0>,5 pigment{rgbf<0,0,1,.5>}}
sphere{<0,0,0>,2.5 translate -2.5*x pigment{rgbt<1,1,0,.5>}}
sphere{<0,0,0>,2.5 translate 2.5*x pigment{rgbt<1,1,0,.5>}}

cylinder { <0,0,-12>,<-5,0,0>,.05 texture { pigment { color rgb
<1,0,0> } } }
---------------------------------------

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