This is an attempt to use MegaPOV's proximity pattern in conjuction
with media.  It leads to very interesting results, tough it's
slooooow (well, text object + sampled pattern + sampled media = 
expected slugginess).  I might try with other objects...

Dirty code and image follows.
---
#version unofficial MegaPov 0.5;

#include "colors.inc"

camera {location <50,50,100> direction z*2 look_at <0,0,0>}


#declare Obj1=//box {<0,0,-5>,<15,15,5> pigment {Red}}
                text {ttf "trebuc.ttf","Neon",.1,0 pigment {OrangeRed*2}
scale 17 rotate y*-180 translate x*10}
object {Obj1}

#declare Sp1=
sphere {0,50 hollow
  pigment {White transmit 1}
  interior {
    media {   
           method 2
           intervals 8
           samples 2,8
           //confidence 
           //variance
           //ratio
           //absorption rgb <,,>
           emission rgb 0.02
           //scattering { Type, COLOR [ eccentricity Value ] [
extinction Value ] }
           
           density {
                        proximity {
                        Obj1, 10
                        type 1 method 0
                        sides 1
                        sample_weighting <0, 0, 0>
                        samples 10
                        max_density 1
                        sample_bailout 30
                          
                        type 1 //0 : dist moyenne, 1 plus petite
distance, 
                               //2 somme des longeurs de tous les
vecteurs du point aux samples, 
                               //3 : type 0 avec un falloff
                        method 0 //0 : random dans bbox, 1 : random, 2
randbb si hors de la bb, sinon rand.   
                          
                        sides 1  //0 faces internes, 1 faces externes, 2
les deux.
                        }//fin prox
                  color_map {[0 White+Orange][1 Black]}
                  //scale 40
                    } 

    
           }//fin media
           }//fin interior
}

object {Sp1}

light_source {<400,500,300> White*2}

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