Wasn't it stu who wrote:
>   I apologize if this question is answered
>too often here(!)... I may have asked myself
>some years past... but I'm looking for a way
>to prevent "phantom lines" or planes from
>occurring where I do DIFFERENCE operations...
>
>     I didn't bring an image to demonstrate,
>but if anyone has seen this, and solved it,
>they will know already what this effect is...
>it's a thin line, or thin plane in the case
>of thick object intersections... and, of
>course, it shouldn't be there after the
>DIFFERENCE operation... what is puzzling me
>is why this occurs inside the removed object
>space, rather than at the intersection itself.
>
>     How could I remove these artifacts ?
>Anybody seen this before ?

If it's a coincident surface problem, then offset the positions or sizes
of one of the components by a tiny amount.

-- 
Mike Williams
Gentleman of Leisure

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