Hi again,

> I'll have a go at reproducing something
> similar to the scene you sent with exponential blobs.

Right, just stuck in the values from the scene you provided (doesn't 
necessarily make sense, but still), here's the result. Rendered in
40s on 1.4Ghz Athlon. Source below.

global_settings { assumed_gamma 1 }

camera { location <0,12,0> look_at 0 }

light_source { <100,300,-100> 1 }                                    

#declare fn_gauss = function(x,y,z,r) { - exp(-(x*x + z*z + y*y)/r) }
#declare fn_blob = function(x,y,z) { (fn_gauss(x+2, y, z+1, 3) * 0.6 + 
                                     fn_gauss(x-3, y, z, 3) * 0.7 + 
                                     fn_gauss(x-1, y, z+2, 2) * 0.9)/4 }
#declare i = 0;
#while(i < 3)
        
  isosurface {
                function { fn_blob(x, y, z)  }        // alternative
declared function
                contained_by { box { -5, 5 } }  // container shape
                threshold -0.095 + i*0.02
                accuracy 0.01                      // accuracy of
calculation [0.001]
                max_gradient 0.3                      // maximum
gradient the function can have [1.1]

                pigment { rgb 1 }
                finish { phong 0.9 diffuse 0.8 }
                
                scale 0.6
                rotate 90*y
                translate (i*4-4)*x
        }
        
        #declare i = i + 1;
#end


sky_sphere {
        pigment {
                planar
                color_map {
                        [0 rgb <0.1,0.1,0.5> ]
                        [1 rgb 1 ]
                }
        }
}

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