Stephen <mcavoys_at@aoldotcom> wrote:
> I am looking for a function to use in an isosurface that will give me
> ripples that will decay to zero over a short distance.
> Can anyone suggest one?

How about something like:

sin(a*x)*exp(-b*x^2)

Plot it, e.g., here for a quick preview:
http://rechneronline.de/function-graphs/

For more ripples over a given range, increase a
For a greater range, decrease b

Bill

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