Hi there Gail.

I tried something with it by using repeat warps and turbulence and-- well, I
ended up changing it to the point where I think it best to paste it into the
message here so you can see what I see when rendering it. It's somewhat like
a rolling fog bank or cloud.
Just got a little slow to render, though, because it needed samples added to
smooth it out. In fact, it might be too choppy-looking to be useful unless
something is changed.
Hmm, like sine_wave for the second density, which I just now commented into
this. Yeah, that doesn't look too bad, to me anyway. Still having trouble
with a overly one direction wave appearance I wanted to control but I'll
stop there.

Bob H.

/* BEGIN rolling fog or cloud */

camera {location <5,2,-5> angle 60 look_at 0}

light_source {-1000*z,1 rotate <45,30,0>}

#include "functions.inc"

plane {y,-0.5 pigment {rgb <0,0,0.5>}}

box {<-20,0.001,-10>,<35,2,25>
 material {
  texture {pigment {color rgbf 1} finish {ambient 0 diffuse 0}}
  interior {
   media {
     // samples 15 // smoother
    emission 0.5
    scattering {2, rgb 0.1 extinction 1}
    density {
     gradient z
     color_map {
      [0.0 rgb 1]
      [0.3 rgb 0.1]
      [1.0 rgb 0]
     }
     scale <1,1,35> //55
     translate z*-10
    }
    density {
     function {
      ((z/4)*f_noise3d(x/3,y*2,z)) // don't ask... only guessing.
      *
      (f_noise3d(x*2,y,z*2)*0.5) // *0.5
     }
     color_map {
      [0.0 rgb 0.75]
      [0.4 rgb 0.5]
      [0.6 rgb 0.25]
      [1.0 rgb 0]
     }
     // sine_wave // softer
     warp {repeat y/3 offset <1,4,3>/5 flip <0,1,1>}
     warp {turbulence <0.1,0.3,1.2>}
     warp {repeat z*4 offset <2,3,4>/5 flip <1,1,0>}
     warp {turbulence <0.4,0.2,1.3>}
    }
   }
  }
 }
 hollow
 //scale <1,0.4,1>
 translate -y
}

/* END */

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