One more little thing:
When you are making the cones for the lat lines, your are making them 1 unit
(the sphere radius) high and then offsetting up and down.  If it happens that
the bottom cone is offset enough that it no longer intersects the sphere
surface, the grid lines won't extend all the way out as you want them to.  This
is especially possible near the poles.  I suggest making the cones twice as big
(just multiply the height and radius by 2) to guarantee that they intersect the
surface.

-tgq

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