Mike Williams wrote:

>Here's something that might get you started. The conventional wood
>pigment is equivalent to "function {sqrt(x^2 + y^2)}", and I've
>substituted "x + F1*0.1" for "x" and "y + F2*0.2" for "y", where F1 and
>F2 are pigment functions. By manipulating the pigment functions you
>should be able to achieve fine control over several of the features you
>require.

Thank you Mike, this looks like the startingpoint I needed.

Ingo

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