If you render the code below you will see a weird phong highlight.

I would have expected a ring-formed phong highlight, but this appears.

camera {
   location y/10
   look_at 0
}

light_source {100*y, color 1}

plane {
   y, 0
   pigment {color 0}
   normal {onion 1.5}
   finish {ambient 0 diffuse 0 phong 1 phong_size 300}
}

Why does it look like that?

Greetings,

Rune S. Johansen

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