My final Cloud Surface scene:


//-------------------------------------------------------------
#version 3.7;

global_settings {
   assumed_gamma 1.0
}

#default {
  finish { ambient 0.0 diffuse 1.0 }
}

//------------------------------------------------------------------------
#include "colors.inc"
#include "textures.inc"
#include "glass.inc"
#include "metals.inc"
#include "golds.inc"
//------------------------------------------------------------------------

camera {
   /*ultra_wide_angle*/ angle 20
   location  < -35.0 , 11.0 , 0.0 >
   right     x*image_width/image_height
   look_at   < 0.0 , 5.0 , 0.0 >
}

// sun -------------------------------------------------------------------
light_source {
   < 50, 100, -250 >*10e4
   color < 1.0,  0.62353,  0.46667 >*2
}

// sky -------------------------------------------------------------------
background { color rgb 0 }
/*
sky_sphere {
   pigment {
     gradient < 0, 1, 0 >
     color_map {
       [ 0.0 color rgb < 1.00000,  0.62353,  0.46667 > ] // Pink
       [ 0.4 color rgb < 0.64706,  0.30588,  0.59608 > ] // Purple
       [ 0.6 color rgb < 0.64706,  0.30588,  0.59608 > ] // Purple
       [ 1.0 color rgb < 1.00000,  0.62353,  0.46667 > ] // Pink
     }
     scale 2
   }
}
*/

// ground -----------------------------------------------------------------
disc {
  < 0, 1, 0 >, 0, 50
  texture { pigment { color rgb < 0.24706,  0.38431,  0.058824 > *1.0 }
  finish {diffuse 1.0 } }
  rotate< 0, 0, 0 >
}

//--------------------------------------------------------------------------
//---------------------------- objects in scene ----------------------------
#local Scale = 5;

//cloud layer:
cylinder {
   < 0.0, 0.0, 0.0 > < 0.0, 0.45, 0.0 > 10.0
   pigment {rgbt 1}
   hollow
   interior {
     media {
       samples 20
       absorption <1.0, 1.0, 1.0>*1/Scale
       scattering {1, <1, 1, 1>*1.5/Scale extinction 1.0 }
       density {
         ripples   // controls the cloud formation
         color_map {
           [0.5 rgb 0.02]
           [0.5 rgb 1.00]
         }
         scale <3, 1, 10>*0.5
         warp {turbulence <2.5, 1.0, 1.6>}
         rotate 45*y
       }
     }
   }
   scale Scale
   translate <0, 1, 0>
}

//-------------------------------------------------------------
//atmosphere:
sphere {
   <0.0, 0.0, 0.0 >, 10.0
   pigment {rgbt 1}
   hollow
   interior {
     media {
       scattering {1, <1, 1, 1,>*0.3/Scale extinction 1}
       density {
         gradient y
         color_map {
           [0.00 rgb 1.00]  //base ground fog
           [0.07 rgb 0.80]  //top ground fog
           [0.08 rgb 0.02] //base atmospheric haze
           [1.00 rgb 0.01] //top atmospheric haze
         }
         scale Scale*2*y
       }
     }
   }
   scale Scale
}

//-------------------------------------------------------------
//artefact:
union {
   cylinder {< 0.0, 0.0, 0.0 > < 0.0, 8.0, 0.0 > 0.25}
   sphere {< 0.0, 8.0, 0.0 > 0.25}
   texture { T01 }
   texture { T_Copper_1A }
}

//-------------------------------------------------------------
// Planet:
union {
   sphere {
     <0.0, 0.0, 0.0> 7.0
   }
   difference {
     cylinder { < 0.0, -0.00001, 0.0 > < 0.0, 0.00001, 0.0 > 20.0 }
     cylinder { < 0.0, -0.00002, 0.0 > < 0.0, 0.00002, 0.0 > 10.0 }
   }
   texture {pigment {White}}
   rotate < 20.0, 0.0, 4.0 >
   translate <80.0, -2.0, 13.0>
}

//-------------------------------------------------------------




-- 
Thomas

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