[JAVA3D] Picking shapes containing shapes

[Dave Cooper]

I have a 3d world with one 3D shape entirely containing another.
When I perform a pickAllSorted on the outer object, near the edge, the result is 
always as I expect : a PickResult[] containing only the outer object.  Unfortunately 
when I pick nearer the middle of the shape, the PickResult[] contains two PickResults 
which are both the interior shape!
 
Any ideas on why this happens would be most appreciated.
 
cheers
 
Dave