I'm satisfied with this one, but with heavier coverage it is not so natural.
And variety for the height is a problem (I cancelled the original form, the new
one is list-to-do).

I found pigment_map should be a better method to composite the base color with
the thin fiber. Thus the fiber can be a darker color than the base. I still use
the 'average', but I will rewrite it.


If the output pigment want to maintain the fiber length, wood heart is another
challenge, I have tried some method, but no perfect one.

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