> A recent thread on p.b.i. drew my attention to http://www.buining.com - 
> those 16-bit PNG elevation maps of Earth, the Moon and Mars look 
> tempting! But AFAIK PoV-Ray's height_field functionality can't handle 
> grayscale 16-bit PNGs... are there any tool for conversion into 16-bit 
> heightfield TGAs available? 

I think this should work:

global_settings{hf_gray_16}

plane{z,0
  texture{
   pigment{
    image_map{png "your_file_here" interpolate 2}
    translate -.5
    scale 2.1
   }
   scale <-1,1,1>
   finish{brilliance 0 ambient 1}
  }
}

camera{
  orthographic
  location <0,0,-1>
  up 1*y right 1*y
  angle 90
  look_at 0
}

--
Jaime

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