I'm using the following media for the atmosphere inside the spinner.


   interior
   {
     media
     {
       scattering
       {
         4, <0.2,0.4,1.0>  // crappy approximaion of TerraPOV value
         extinction  1
       }
       density
       {
         cylindrical
         poly_wave  0.25
         density_map
         {
           // should be based on city_units!!!
           [0  rgb 100/5000000]
           [1  rgb 010/5000000]
         }
         scale  city_radius
         rotate  x * 90
       }
     }
   }


The "city_radius" is something less than 1000 units. What kinds of stuff 
can I do to improve rendering times with this media enabled? Right now 
it's the single greatest performance bottleneck in my scene.



-- 
http://isometricland.com

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