I'm not sure that this is exactly what you are after, but can you use a 
height field and an internal bitmap?

Here is an example:

camera {
   location <0, 0, -200>
   look_at <0, 0, 0>
   rotate <45, -45, 0>
   }

light_source {
   <-2000, 4000, -3000>
   color rgb 2
   }

height_field {
   function 400, 400 {
     pattern {
       marble
       turbulence .075
       scale .25
       }
     }
   translate <-.5, 0, -.5>
   scale <100, 10, 100>
   texture {
     pigment {
       color rgb .5
       }
     finish {
       specular .5
       roughness .005
       reflection { 1, 1 }
       }
     }
   }

sphere {
   <0, 40, 0>
   20
   texture {
     pigment {
       color rgb <.75, 0, 0>
       }
     finish {
       specular 1
       roughness .005
       reflection .25
       }
     }
   }

Not exactly perfect, but it is something to work from.

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