Curiouser and curiouser...

The difference function has a problem too:
//Start of scene

camera {location <0,4,-5> look_at 0}

background{color rgb 1}

light_source {<-10, 10, -10> color rgb 1}

difference{
quadric {<1, -1, 1>, <0, 0, 0>, <0, 0, 0>, 0 clipped_by{plane{y,-1}}}
sphere{0,2}
pigment {color rgb .5}}

//End of scene

(I changed things around a little...)

Also, try adding an inverse to the quadric - you get the same thing as if
you were to replace the difference with the merge again...

Bent

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