Here is the scene file which renders a black media object under the clouds
in front of a blue background. (See p.b.I. for an example image with has a
different background). Please try if you get the same results or if it is
white in your case.

Thanks,

Marc-Hendrik


#version unofficial Megapov 0.5;
global_settings {
   assumed_gamma 1.0
   ambient_light 0
   max_trace_level 14
}

camera
{
  location  <4, 1.7, -25>//
  //direction 1.5*z
  //right     4/3*x
  //angle 35
  look_at   <0, 11.200001,  0.00001>

}
background {rgb <0.3,0.3,0.5>}

light_source
{
  0*x // light's position (translated below)
  color rgb <1, 1 , 1> // light's color
  //area_light y,z,3,3 orient
  translate <-300, 1000, -450>
}

#declare Clouds=function "ridgedMF",<1,2.25,7,-1,1>

#declare Y=0;
#declare Ivals=5; //Number of cloud planes

#while(Y<1)
//plane{y,100+(Y*20) clipped_by{box{<-1000,0,-1000>,<1000,200,1000>}}
polygon{5,<-3000,-3000>,<-3000,3000>,<3000,3000>,<3000,-3000>,<-3000,-3000>

  rotate x*90 translate y*100+(Y*20)
  translate y*100+(Y*20)
  pigment{function Clouds(x,y,z)/3.8+noise3d(x/20,y/20,z/20)/3.5+(z/20)
   scale<300,150,300> phase -.5
   color_map{[.25 rgbf 1][.4 rgbt<1/1.5, 1/1.5, 1/1.5, .01>]}
  }
  finish{diffuse 1.5 ambient .25 }
  hollow double_illuminate
}
#declare Y=Y+1/Ivals;
#end

box {<-6,0,-2>, <8, 3,0>            //Schneegestoeber
     hollow on
     pigment {rgbf 1}
     interior{
        media{
           scattering{1,0.002}
           density{ gradient y
              color_map{
                 [0.4 rgbt 1]
                 [0.5 rgb 500]
                 [0.6 rgbt 1]
              }
              translate <2,-2.6,0>
              rotate z*-15
              turbulence 0.3

              scale 6
              translate <3,-0.5,0>
           }
           method 1
           intervals 1
           samples 10, 10
           confidence 0.999999
           variance 1.0/1024
        }
     }
}

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