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// All of these files can be obtained at NASA's Visible Earth website
// http://visibleearth.nasa.gov/
Where on the site? Searches for the file names and even the term mercator
all come up empty.
Jim
"Scott Gammans" <deepgloathatesspamaatyahoodotcom> wrote in message
news:web.3fbd42078ae459e44e0a58990@news.povray.org...
> Someone asked me to post this. It's the earth.inc file that I use to
create
> the images of Earth that are on my website (http://www.scottgammans.com).
>
> // earth.inc by Scott Gammans http://www.scottgammans.com
>
> // This file uses three images of the earth, all mercator projections:
> // (1) earth_landmask_mercator.tif - black & white landmask where
> // water is black and land is white
> // (2) earth_truecolor_mercator.tif - truecolor image of earth
> // (3) earth_clouds_mercator.tif - black & white cloud layer image
> // All of these files can be obtained at NASA's Visible Earth website
> // http://visibleearth.nasa.gov/
>
> #declare EARTH_RADIUS=3963;
>
> // Example usage: object {Earth(0,true,true,true,1.0)}
> // where
> // axial_rot = Earth's axial rotation in degrees
> // use_spec = if true, use specular water feature
> // use_clouds = if true, use cloud layer
> // use_diff = if true, use atmospheric diffusion
> // diff_adj = should normally be 1.0. Amts above/below 1
> // thicken/reduce the blue ring of diffusion
> // around planet. Useful for when rendering a
> // small image and you want the ring to show up
> #macro Earth(axial_rot,use_spec,use_clouds,use_diff,diff_adj)
> union {
>
> // The base planet:
> sphere {0,EARTH_RADIUS
> texture {
> #if (use_spec=true)
> // This image file is a two-color mercator-projection
image
> of
> // the Earth where the water is black and the land is
white
> image_pattern {tiff "earth_landmask_mercator.tif" map_type 1}
> texture_map {
> // This is a true-color mercator image of the Earth
> [0.0000 pigment{
> image_map {
> tiff "earth_truecolor_mercator.tif"
> map_type 1
> }
> }
> finish {
> ambient 0.0
> specular 0.10 // 0.0
> reflection {0.05,0.25} //
> roughness 0.10 // 0.05
> diffuse 0.85 // 0.6
> brilliance 1 // 1.0
> phong 0.025 // 0.0
> phong_size 75 // 40 < less glossy
> }
> ]
> // This is a true-color mercator image of the Earth
> [1.0000 pigment{
> image_map {
> tiff "earth_truecolor_mercator.tif"
> map_type 1
> }
> }
> finish {ambient 0}
> ]
> }
> scale EARTH_RADIUS
> #else
> // This is a true-color mercator image of the Earth
> pigment{image_map {tiff "earth_truecolor_mercator.tif"
> map_type 1}}
> finish {ambient 0.0}
> #end
> }
> }
>
> // The cloud layer:
> #if (use_clouds=true)
> difference {
> sphere {0,EARTH_RADIUS*1.0002}
> sphere {0,EARTH_RADIUS*1.0001}
> texture {
> pigment {
> // This is a two-color mercator image of Earth's cloud
> layer
> image_pattern {tiff "earth_clouds_mercator.tif" map_type 1}
> color_map {
> [0.00 color rgbt <1,1,1,1>]
> [1.00 color rgbt <1,1,1,0>]
> }
> }
> finish {ambient 0.0}
> }
> }
> #end
>
> // The diffusion of sunlight in the atmosphere:
> #if (use_diff=true)
> difference{
> sphere {0,EARTH_RADIUS*1.0037*diff_adj}
> sphere {0,EARTH_RADIUS*1.0003}
>
> hollow
> material {
> texture {
> pigment {rgbf 1}
> finish {ambient 0.0}
> }
>
> interior{
> media {
> scattering {4, <0.0005,0.0005,0.001>}
> intervals 1
>
> }
> }
> }
> }
> #end
>
> rotate y*axial_rot
> rotate x*-23.4
> }
> #end
>
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