Thanks, Kenneth.

Of сourse I've tried to play with arguments scaling , but problem in shifting
from origin (please look at attachment). Still can't figure out how it work.

----------------------------------------------------
#version 3.8;
global_settings { assumed_gamma 1 }

camera
{ location <1,1,1> * 2
  look_at <0,-0.5,0>
  angle 50
}

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

#declare somb = function (x,y) { sin (sqrt (x*x + y*y)) / sqrt (x*x + y*y) };

height_field
{
  function 500, 500 { somb(x*10, y*10) }

  smooth
  scale <1, 0.3, 1>
  pigment { green 0.8 }
}
----------------------------------------------------
YB

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