Hi Yadgar!

From what I understand, you want a vegetation map with fine details that
fits your heightfield, but doesn't take up too much memory. Well you could
use a grey, low resolution image map (smoothed with "interpolate 2") as a
reference map, that doesn't really contain any textures, but only a
reference to *where* you want each texture.. Although the referance map is
low resolution, I doubt it'll be a problem..

The reference map point to any textures, depending on it's brightness, so
you can paint the vegetation in a paint program..

From old days, POV has texture maps that only works with GIF input.. I found
a nicer way with POV3.5 ... here is the basics to give you the idea:

texture {
  function { pigment {
    image_map { tga "...." interpolate 2 }
  }}
  texture_map {
   [ 0.00 Soil ]
   [ 0.25 Grass ]
   [ ...etc ... ]
}}


Regards,
Hugo

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