"Sven Littkowski" <sve### [at] jamaica-focuscom> wrote:
> Greetings.
>
> 1
> I am looking for images like those about our earth, but with real clouds and
> in high resolution. I need them as texture for a rendered earth. Who can
> supply links?
>
> 2
> What is the name of this kind of projection?
>
> Thanks,
>
> Sven

Try here:  http://www.nasa.gov/vision/earth/features/blue_marble.html

I think it's called a spherical projection, but there may be a more
technical term for it.

#declare earth_tex = texture {
pigment {
 image_map {
  jpeg "nasa_blue_marble.jpg"
  map_type 1        // 0=planar, 1=spherical, 2=cylindrical, 5=torus
  interpolate 2     // 0=none, 1=linear, 2=bilinear, 4=normalized distance
  once           // for no repetitive tiling
 }
}
  normal {
    bump_map {
      jpeg "earthbump_usgs.jpg"
      map_type 1        // 0=planar, 1=spherical, 2=cylindrical, 5=torus
      interpolate 2     // 0=none, 1=linear, 2=bilinear, 4=normalized
distance
      once           // for no repetitive tiling
      bump_size 2.5     // 0...3
    }
  }

NASA has some really high resolution ones, but none that I found had clouds.
 I used procedural clouds on mine.  You will have to play with the scaling
to get it to look natural.

#declare earthclouds_tex = texture {
pigment {
      bozo
      turbulence 0.65
      octaves 6
      omega 0.7
      lambda 2
      color_map {
          [0.0 0.1 color rgb <0.85, 0.85, 0.85>
                   color rgb <0.75, 0.75, 0.75>]
          [0.1 0.5 color rgb <0.75, 0.75, 0.75>
                   color rgbt <1, 1, 1, 1>]
          [0.5 1.0 color rgbt <1, 1, 1, 1>
                   color rgbt <1, 1, 1, 1>]
      }
      scale <2, 0.5,2>
}

I've also attached the bump map from US Geological Survey.


Mike

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