On 30-4-2016 18:26, Jaime Vives Piqueres wrote:
>    That's strange... I'm getting good results with just 16 samples.
>

This is basically what I do; most other details are Gilles' original 
settings (more or less):

   #declare P_cloud2_1 =
   pigment {density_file df3 "cloud2_1.df3"
     lambda 3
     omega 0.6
     interpolate 1
     translate -0.5
     scale <1, -1, 1>
   }

   #declare Cloud1 =
   box {-0.5,0.5
     texture {pigment {Clear} finish {ambient 0 diffuse 0}}
     hollow
     interior {
       media {
         scattering {1, C_Sun*0.006 extinction 0.25}
         intervals 1
         samples 100, 1000
         density {
           gradient y
           density_map {
             [0 pigment_pattern {P_cloud2_1}
                turbulence Turbulence*0.1
             ]
             [1 pigment_pattern {P_cloud2_1}
                turbulence Turbulence*2
             ]
           }
         }
       }
     }
     scale <4/3,1,1>
   }


-- 
Thomas

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