Before continue the pigment_map and color, I tried a incredible detail idea
yesterday that I thought recently. Can be a new target to complete in the
future.

It is the knot.
But I'm willing to develop this feature with not so accurate shape only, I'd
like to implement it with (as much as possible) simple mathematical formula.


https://www.researchgate.net/figure/Longitudinal-section-through-a-tree-trunk-and-branch-Mueller-et-al-2006_fig1_274618
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