----- Original Message ----- 
From: "Jellby" <me### [at] privacynet>
> The other solution is creating a mesh out of this data. I tried using the
> HF_Sphere macro, but I'm afraid I need much better resolution than
> possible. The maximum resolution vector I could use was about <500,1000>
> (larger dimensions gave parsing errors in shapes.inc), and I'd need
> <10801,21600>. For a total vertex number larger than a few million, this
> number is written in exponential notation, and I don't think the mesh2
> parser likes that. Besides, I'm afraid the file created (if I want
> HF_Sphere to write a file) would be really huge.
>

I took a look at HF_Sphere and I think you can let it produce pieces of for
instance 15 degrees in stead of 180 degrees (just like the pieces inside an
orange).
You have to produce 24 of them for the whole earth and use the pieces that
are visible. You don't need the back side of earth.
Experiment with the line:

#local Dir = vrotate( vrotate(x,(-89.9999+179.9998*UV.z)*z), -360*UV.x*y );

If I understand the macro correctly it rotate from -90 until +90 degrees.

Just a thought.

Success

Jaap Frank

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