Canicus,
I cannot explain them, but I too have seen these on several iso-surfaces.   I
thought perhaps the artifacts might go away with AA as is the case
sometimes, but they did not.
Bill P.

> Apologies if this has been answered before; I suspect it should have been,
>
> In my first-ever experimenting with iso-surfaces, I've run across this: <see
> image>
>
> There are some quite apparent "gridlines" appearing on the perturbed sphere;
> they're ugly and I've no idea where they are coming from.  I've played with
> the 'accuracy' setting with no success

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