popoulus style

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Cygnus

convert their world coordinates to a relative coordinates by parenting a pivot at the vertices position.
point the pivot to the centre of the sphere and move it backwards/forwards to lower/heighten

then recreate the mesh

OR-------

Use VertexNX (search for the similar commands) and use those values to manipulate vertices in and outward.

I gota run- someone explain this one a bit more? :D