And a view at altitude 10 km. I put Tethys and Titan a little bit higher 
than the plane of the ring for artistic reasons.

Note that the ring material is composed of two isosurfaces, one for the 
finer fraction (only a crackle function) and one for the coarser 
fraction. Additionally 3 million rocks form the coarsest fraction.

Isosurfaces'code:

//----------------------------------------------------------------------
//Isosurface for the finer ring elements (thanks to Christian Froeschlin)
#declare f_particles =
function(x,y,z) {
     0.8
   - f_crackle(400*x, 400*y, 400*z)
   + f_bozo(x*100, y*100, z*100)
   - f_waves(x*100+f_bozo(x*100,0,0), y*10+f_bozo(0,y*10,0), 
z*100+f_bozo(0,0,z*100))
}

#declare f_fineparticles =
function(x,y,z) {0.7 - f_crackle(x*800, y*800, z*800)}

intersection {
   union {
     isosurface {
       function {f_particles(x,y,z)}
       contained_by {
         box {<0.00, -0.5*0.01, -117581.00*0.001>, <117581.00*0.001, 
0.5*0.01, 117581.00*0.001>}
       }
       accuracy 0.0001
       max_gradient 1000
       texture {
         pigment {srgb <0.96, 0.96, 0.98>*0.75}
         finish {diffuse 0.8 specular 0.2 roughness 0.001}
       }
     }
     isosurface {
       function {f_fineparticles(x,y,z)}
       contained_by {
         box {<0.00, -0.4*0.01, -117581.00*0.001>, <117581.00*0.001, 
0.4*0.01, 117581.00*0.001>}
       }
       accuracy 0.0001
       max_gradient 1000
       texture {
         pigment {srgb <0.94, 0.94, 0.90>*0.5}
         finish {diffuse 0.8 specular 0.2 roughness 0.001}
       }
     }
   }
   difference {
     cylinder {<0, -1, 0>, <0, 1, 0>, 117580.00*0.001}
     cylinder {<0, -1.1, 0>, <0, 1.1, 0>, 92000.00*0.001}
   }
   hollow
}



-- 
Thomas

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