"gulino" <nomail@nomail> wrote:
>  can someone make a
> simple example for me to see?

There were several examples in the thread I posted:
https://news.povray.org/povray.general/thread/%3Cweb.63ea928499ce13121f9dae3025979125%40news.povray.org%3E/?ttop=444970
&toff=150&mtop=439826

  height_field {
    function 500,500 { pattern { bozo scale 0.08 } }
    smooth
    pigment {rgb z}
    scale <1,0.4,1>
    }

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