There seem to be a problem with the Supercone object from shapes.inc. The z
component of the input vectors are not handled correctly somehow.

#include "shapes.inc"
camera {location 5*x look_at 0}
background {color <0.4,0.8,1.0>}
light_source {<3,2,1>*1000, color 1}
object{
   Supercone(0, 2.0,1.0, -z, 1.5,0.5)
   //     plus and minus ^ give equal result!
   pigment {color rgb 1}
}

Rune
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