Wasn't it Alun who wrote:
>I'm creating a scene with two isosurface objects that use similar
>f_hetero_mf functions - one for a jagged looking mountain range
>in the distance, and one for some smoother rolling hills in the
>foreground.

It looks like a really weird bug to me.

One unusual feature of the effect is that if you re-render the unchanged
scene, you get a different result most of the time. If you don't spot
that fact (it took me a while) then it's easy to make a small change to
the source and think that you've found a workround.

-- 
Mike Williams
Gentleman of Leisure

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