The vertex normals of a sphere are the average of all attached surfaces.
Isn't this what you want?
Note that pressing 'n' to display normals, displays SURFACE normal and not vertex normals. AC3D calculates normals automatically using geoemtry and the object's crease angle for smoothing. Any surfaces that are set to 'flat' will have their vertex normals the same as the surface.
Hope this helps,
Andy
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