In the scene below, try all four locations. In the first all is 
ok, the second gives a black image. The third is ok again and 
the fourth is missing the sphere.
Why does this happen?

light_source{<500,500,-500> rgb 1}
camera{
   location  < 0.0, 0.0, -0.47>   
   //location  < 0.0, 0.0, -0.46>   
   //location  < 0.0, 0.1, -0.46>
   //location  < 0.0, 0.1, -0.45>
   look_at 0
   angle 90
   orthographic
}
sphere{0.2*y,0.2 pigment{rgb 1}}
cylinder{0,-0.5*y,0.2 pigment{rgb<1,0,0>}}

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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