

"yesbird" <nomail@nomail> wrote:
> Thanks, Kenneth.
>
> Of course 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.
>
Your camera was aimed toward z, which confused me a bit, although I am still
not sure as to what problem you are seeing.
If you mean that the 'center' of the sine wave circle is not 'at the origin' but
at z=1 instead, that could be due to a longstanding problem with how functions
are kind of mirrorreversed when used in a height_field. (OR, maybe due to the
construction of your sin function itself?) I have not tested a function
height_field in awhile, so I am not sure if the odd mirroring problem was fixed
at some time in the past. (I thought it was.)
Anyway, here's my own version of your scene, with a different camera position.
Maybe it will help to clarify your question and my answer ;)

#version 3.8;
global_settings { assumed_gamma 1 }
camera
{ // location <1,1,1> * 2
location <1.5,3,2>
look_at <.5,.3,0>
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*20, y*20) }
smooth
scale <1, 0.3, 1>
pigment { green 0.8 }
}
//
plane{y,0 pigment{rgb .2}}
// origin markers 
union{
cylinder{5*x,5*x,.07 pigment{rgb .5*<0,1,1>}}
cylinder{3*y,3*y,.07 translate .00001*z pigment{rgb <.4,1,.4>}}
cylinder{5*z,5*z,.07 translate .00001*x pigment{rgb <.6,.6,1>}}
text {
ttf "timrom.ttf" "x"
.2, 0
translate .2*z
scale 1
rotate 90*x
translate <5.5,0,0>
pigment{rgb 1}
}
text {
ttf "timrom.ttf" "y"
.2, 0
scale 1
translate <0,3.5,0>
pigment{rgb 1}
}
text {
ttf "timrom.ttf" "z"
.2, 0
translate .2*z
scale 1
rotate 90*x
translate <0,0,5.5>
pigment{rgb 1}
}
scale .3
no_shadow
}
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