Among other things, Jellby saw fit to write:

> so now, if I apply my own patch, I shold be able to do more testing.
>
> I am rendering an image at 4000x3000 resolution, and most of the screen is
> filled by the modelled Earth and it's reflection (this makes it not too
> useful to try to restrict the modelling to the visible parts, since
> between the reflection and the shadows, most of the surface plays some
> role).

Well, I managed to create a 7500x3750 mesh of the data in a 16GB-RAM machine
(how much more memory does a mesh take compared to an image map?), and it
doesn't look so well, though maybe it could be fixed with some normals and
double-illuminate. The good news is the mesh renders about twice faster.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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