Hmm, and it's 21600x21600 chunks, too...how do I make an isosurface that 
applies an image as a radius modifier to a section of a sphere so that 
the entire image maps to a 45x45-degree segment?

The code I have for the entire image to the whole sphere is

#include "functions.inc"
#declare fn_EarthPigm1=function{
   pigment{
     image_map{
       jpeg "srtm_ramp2.world.5400x2700.jpg"
       map_type 1
       once
       interpolate 4
     }
   }
}
#declare EarthIso=isosurface{
   function{f_sphere(x, y, z, 0.633)-(fn_EarthPigm1(x,y,z).red*0.006)}
   contained_by{sphere{0,0.7}}
   texture{pigment{rgb 1}}
   scale  <-1,1,1>
   rotate <90,0,-90>
}

...I'm guessing there's a way to apply fn_EarthPigm1 to only part of the 
sphere?  But how?

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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