Am 26.11.2014 14:12, schrieb Stephen:
> ... I was hoping that someone had devised a way to use the
> greyscale value.
>


#declare PP_Claud = pigment{image_map{jpeg "my_cloud_map" map_type 1 
interpolate 2}}

  sphere{ 0, 1.005
    texture {
      pigment_pattern{PP_Claud}
      texture_map {
       [0.00 texture {pigment{rgb 1 transmit 1} finish{diffuse 1}}]
       [1.00 texture {pigment{rgb 1 transmit 0} finish{diffuse 1}}]
      }
    }
  }

...where "my_cloud_map" is a grayscale, not a color palette image!

and it might be a good idea to add the cloud texture to a slightly 
larger scaled sphere (than the planet) and not as top layered texture as 
you did.
And you didn't ask for it but anyway: adding a specular map in pretty 
much the same way (giving highlights to the ocean covered area but not 
to the land mass) makes it even more realistic.
You can obtain maps for this e.g. from NASA's Blue Marble page.

With some scattering media atmosphere it gives something like this:
http://news.povray.org/povray.binaries.images/thread/<4a056976@news.povray.org>

-Ive

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