SharkD <mik### [at] gmailcom> wrote:
> Nope. I want the double derivative.

  Then your only option is to generate the heightfield using a function
and then use the double derivative of that function with respect to x and
another with respect to y and combine them appropriately to create the
desired pattern, which you then can use to create the pigment.

-- 
                                                          - Warp

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