> These eggs are nothing more than squashed spheres. I have no idea how to 
> make an authentic egg shape. (But I imagine it would involve isosurfaces 
> - and be very very slow!)

No need! Simply use CSG:

#declare bottom =
   intersection {
     sphere { 0, 1 }
     plane { y, 0}
   }

#declare top =
   difference {
     sphere {
       0, 1
       scale <1, 1.6, 1>
     }
     plane { y, 0 }
   }

#declare Egg =
   union {
     object { top }
     object { bottom }
   }

You just have to adjust the y scale factor in the top part to suit your 
needs.

Regards,

-- 
Laurent ARTAUD (lau### [at] freefr)

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