Sorry about that last message, I accidentally sent it as HTML. Here it is as
pure text.
    The following POV code is an adaptation of Mike Andrews clouds.pov code
for just the clouds. I have a need to see how it was done, but in units of
feet and not miles. I have tried to modify it, but it comes out pure black -
though it renders just as slowly as his clouds.pov scene! Anyone know what I
am doing wrong?

    Jon


    // Start of cloud code ... rather a mess.
    #declare cloudShape = density { spotted ramp_wave }

    #declare D_Cloud_Center =
    density {
       cloudShape triangle_wave
       colour_map {
          [0.5 colour Gray95]
          [1.0 colour Gray75]
       }
    }

    // Calculate the correct colour_map values.
    #declare NT = floor((groundRad + 6) / 6);
    #declare DT = (groundRad + 6)*5280 / NT;
    #declare V1 = 1 - (6 - 2.0)*5280 / DT;
    #declare V2 = 1 - (6 - 2.5)*5280 / DT;
    #declare V3 = 1 - (6 - 3.5)*5280 / DT;
    #declare V4 = 1 - (6 - 4.5)*5280 / DT;
    #declare V5 = 1 - (6 - 5.5)*5280 / DT;
    #declare V6 = 1 - (6 - 6.0)*5280 / DT;

    // container for cloud.
    difference {
       sphere { 0, (groundRad + 6.0)*5280 }
     sphere { 0, (groundRad + 3.5)*5280 }
       pigment { rgbf 1 }
       interior {
          media {
             intervals mSamples
             scattering { 2, rgb 5 extinction 1.0}
             samples 2, mSamples
             confidence 0.9999
             variance 1/1000
             density { D_Cloud_Center scale 2*3*0.2*5280 }   // fine scale
cloud detail
       density { D_Cloud_Center scale 2*3*0.08*5280 }
             density {         // confine the cloud to the container
                onion
                colour_map {
              [V1 rgb 0]
            [V2 rgb 0]
            [V3 rgb 0]
            [V4 rgb 1]
            [V5 rgb 1]
            [V6 rgb 0]
                }
                scale DT
             }
             // large scale cloud detail
             density {
                onion
           colour_map {
            [V1 rgb 0]
            [V2 rgb 1]
            [V3 rgb 1]
            [V4 rgb 0]
            [V5 rgb 0]
            [V6 rgb 0]
           }
                warp { turbulence 0.25*0.8 octaves 3 lambda 3 omega 0.7 }
                scale DT
             }
          }
       }
       translate -groundRad*5280*y
       hollow
    }

    // atmosphere
    #declare NT = floor((groundRad + 20.0) / 20.0);
    #declare DT = (groundRad + 20.0)*5280 / NT;
    #declare V1 = 1 - (20.0 - 5.0)*5280 / DT;
    #declare V2 = 1 - (20.0 - 5.0)*5280 / DT;

    sphere {
       0, (groundRad + 20.0)*5280
       pigment { rgbf 1 }
       interior {
          media {
             intervals mSamples
       scattering { 4, rgb atmCol extinction 1 }
       samples 2, mSamples
       confidence 0.9999
       variance 1/1000
             density {
                onion ramp_wave
                colour_map {
                   [V1 rgb 1]
                   [V2 rgb 0.5]
                   [1  rgb 0]
                }
             }
             scale DT
          }
       }
       translate -groundRad*5280*y
       hollow
    }

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