> #declare N_WoodGrain12a = normal {
>     bozo
>     turbulence 0.04
>     lambda 2.5
>     omega 0.1
>     octaves 7
>     scale <0.5, 0.05, 0.05>
> };

Ok, but how did you arrive at that?
I looked through the docs on normal, but didn't see any way to apply the pigment
or texture as a normal.

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