I want to perturb the normals of a sphere so that they all point 'lower'
than usual. So the normals on the north pole (+y) of the sphere should
point slightly outwards in the x-z plane rather than straight up, the
normals on the equator should point south, and those on the south pole
should still point down. I'm having trouble visualising the exact effect
normal patterns are supposed to have, so I thought I'd better check.
Is an appropriately scaled gradient y pattern what I want here?

Daniel

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