Yet another mystery. In following example 50 is resolution, but how to set range
for x,z ? Only small part of surface is visible.

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#version 3.8;
global_settings { assumed_gamma 1 }

camera
{ location <1,1,1> * 2
  look_at <0,0,0>
  angle 50
}

light_source { <10,10,10>, rgb <1,1,1> }

height_field
{
  function 50, 50 { sin (sqrt (x*x + y*y)) / (sqrt (x*x + y*y)) }
  smooth
  scale <1, 0.3, 1>
  pigment { green 0.8 }
}
---------------------------------------------------
YB

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