Hi Gilles the only things I can think of that might help are blackhole warps
and perhaps as a last resort image maps!

Mick

"Gilles Tran" <tra### [at] inapginrafr> wrote in message
news:39B7C8C8.3D5EB9D4@inapg.inra.fr...
> I've been wondering about how to make these, either as a pigment
> pattern, or at least as a function enabling to position and scale
> objects. Basically, it looks like crackle, but with zones of increasing
> or decreasing cell sizes. I've made  experiments using a blob density
> function that attracts/repels the elements (spheres) according to their
> proximity to centres. The size (radius) of each object is afterwards
> calculated as the minimum distance from its 8 neighbours (it's in 2D).
> It works, but it's very difficult to control to obtain a desired effect
> (like a pinching or bulging at a particular place). Anyone would have
> pointers to algorithms, or ideas ???
>
> G.
>

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