Christoph Hormann wrote:
> 

> >
> > [...]
> >
> > I would say it's a design assumption which turns out to be wrong, sometimes:
> > The Inside test and the trace test may disagree;
> > They should not, but they do in some occurences.
> >
> 
> Is it allowed to ask, *why* there is no intersection if one point is
> outside and the other inside?
> 

All questions are allowed... Even "How many angels can dance on the head of a pin ?"
Getting the correct answer might be harder.

The code for inside and trace is always different (by design).
I guess that different algorithms can give different results.
(Just look at the sturm solver option for example)...

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