You can also use
isosurfaces (with or without Mike Williams' "thickening" trick),
heightfields
https://news.povray.org/povray.general/thread/%3Cweb.63ea928499ce13121f9dae3025979125%40news.povray.org%3E/?ttop=444299
&toff=100&mtop=439826
polynomials,
and parametrics.
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