As always the posting of the question very qickly leads to an answer

#declare Sphere =
sphere {
  <0,0,0>, 1
  pigment { rgb <1,0,0> }
}
#declare Min = min_extent ( Sphere );
#declare Max = max_extent ( Sphere );
object { Sphere }
box {
    Min, Max
    pigment { rgbf <1,1,1,0.5> }
}



However this is a bounding box of an object, can I extract the co-ordinates of
the bounding box as it's projected onto the viewing plane so I can provide
these as co-ordinates to a function like html ISMAP and USEMAP to allow
hypertext like functions from web background pages?

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