Excuse me for being so daft. But how do I wrap an image map around a
sphere? Here's what I have, copied from the Insert, Ready made, Image
map file for POV 3.1g:

sphere
{<0,0,0> 5
  texture
  {
    pigment
    {
      image_map
      {
        sys "marsmap.bmp"
        interpolate 2 // smooth it
        once   // don't tile image, just one copy
        
      }
      // transform it to unit-size (-1 to +1)
      translate -0.5*(x+y) // center on the origin
      scale 2              // make it unit-sized
    }
    finish {ambient 0.3}
  }
}
This keeps coming out as a plane, but I see my image map on it at least.

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