I think you can make such ridges by adding a black and white color map ti
the crackle item in the isosurface defiistion! Try something like:

color_map {
    [0.0 color rgb 0]
    [0.3 color rgb 0.3]
    [0.3 color rgb 0]
    [0.4 color rgb 0]
    [0.4 color rgb 0.4]
    [1.0 color rgb 1]
}

You get the idea...

Simen.

>    Right. I did this when I moved on, but I wish I could have made those
>cool ridges on purpose 8-)...
>

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