[R] 3d plot of earth with cut

[Balint Radics]

Hello,

Could someone suggest a package/way to make a 3D raster plot of the Earth
(with continent boundaries), and then make a "cut" or "slice" of it such
that one can also visualize some scalar quantity as a function of the
Radius/Depth across that given slice ?

Formally, I would have a given, fixed longitude, and a list of vectors
{latitude, radius, Value}
that would show the distribution of the quantity "Value" at various depths
and latitudes in 3D.

Thanks a lot in advance,
Balint

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