I've finally got my planetary model working! Proper accurate topographic
information, geoid compensation, the lot. Looks good, too.

Now I want to construct a map of my moon (which was one of the reasons
behind the whole project). Ideally I want to produce something like a
spherical imagemap --- they're similar enough to a classic Mercator map
to be usable. Originally I was hoping that the spherical camera would
help here, but it turns out I'd misread it and instead of being a
spherical camera looking *inwards* it's a spherical camera looking
*outwards*.

I could place the camera at the centre of my moon, but unfortunately due
to the way I'm treating the surface (an isosurface intersected with a
sphere representing sea level) that will have the effect of reversing
the land and the sea.

Having thought about it some more, I think that what I'm looking for is
a cross between an orthographic and spherical camera --- I want Povray
to cast rays radially inwards from a spherical viewing surface towards
the centre of my model. Does such a thing exist? If not, can I fake it?

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