The above was based on observing the above sample (shaded mesh is hi-res sub-D version of white source mesh, blue lines show source mesh with a vertex 'morphed')...

Note that only vertex A in the target mesh would get the full weight of such a morph, whereas B and C would get (in this case) half the weighting, D would get less than half and E,F,G would effectively get none (they are pretty much entirely influenced by the vertices directly above them).

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