You may want to look into extrusions. There is a relative simple option in the
mesh macro include file or use the more complex Striscia @
https://news.povray.org/povray.binaries.utilities/thread/%3CXns94D4AF6BE46A0seed7%40news.povray.org%3E/?ttop=437912&tof
f=100

An other way to get nice curves is to use blobs. Scale them large.

ingo

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