> The speckles vex me.  I speculate (ahem) that they occur in places where
> blobbing makes the surfaces less than one pixel thick (he says,
> expecting titters from those more mathematically blob-lucid).  Any help
> on that?

It's a blob, eh?

Have you tried turning on the sturmian root solver? Either that or like you
say, it might be a coincident-surface type problem... (Unlikely though.)

HTH
Andrew.

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